CN113880266A - Phosphorus-free scale inhibitor and preparation method thereof - Google Patents
Phosphorus-free scale inhibitor and preparation method thereof Download PDFInfo
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
- C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
- C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances
- C02F5/12—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances containing nitrogen
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Abstract
The invention belongs to the technical field of circulating water treatment, and particularly relates to a phosphorus-free scale inhibitor and a preparation method thereof, which solve the problems of high use concentration, high use cost, poor stability, unsatisfactory scale inhibition effect and the like of the phosphorus-free scale inhibitor in the prior art, wherein the phosphorus-free scale inhibitor comprises the following raw materials: polyaspartic acid, modified starch, acrylic acid-maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a composite additive. The scale inhibitor obtained by the invention has stable performance, low use concentration and excellent scale inhibition performance, has the effects of chelating, dispersing, lattice distortion and the like on the scale, can effectively inhibit the formation of the scale, has good corrosion inhibition effect, can effectively prolong the service life of equipment, has excellent comprehensive performance, and can be widely applied.
Description
Technical Field
The invention relates to the technical field of circulating water treatment, in particular to a phosphorus-free scale inhibitor and a preparation method thereof.
Background
The shortage of water resources is a big problem in China and other countries and regions in the world. With the rapid development of society and industrial production, the problems of water resource shortage and water pollution become more and more serious, and in order to solve the water resource crisis, seawater desalination technology and water recycling technology are developed. However, fouling is prevalent in desalination of sea water, water circulation systems. The dirt in the water may cause serious problems of membrane pollution, reduction of pipeline heat conductivity coefficient, aggravation of equipment corrosion and the like in the seawater desalination process. The scale inhibitor has the functions of chelating, dispersing, lattice distortion and the like on the scale, can effectively inhibit the formation of the scale, and is undoubtedly an important and very effective method for using the scale inhibitor.
Most of scale inhibitors used for industrial circulating water are organic phosphoric acid type and copolymer type scale inhibitors. The organic phosphoric acid, especially the organic poly-phosphoric acid and the salt thereof, has stable chemical properties, can effectively inhibit the deposition of various scales such as calcium carbonate, calcium sulfate, barium sulfate and the like, and is widely applied to industrial water treatment of electric power, chemical engineering, metallurgy, oil fields and the like, and comprises PBCTA (2-phosphate-1, 2, 4-tricarboxylic acid butane), ATMP (amino trimethyl phosphoric acid), EDTMP (ethylene diamine tetra methylene phosphonic acid), HEDP (hydroxy ethylidene diphosphonic acid) and the like. However, phosphate is easily hydrolyzed to generate phosphate ions, calcium phosphate precipitates are formed with Ca in water, the inhibition effect on zinc scale, iron oxide precipitates and the like is not obvious, and a phosphorus-containing compound is one of nutrient sources of microorganisms, is easy to nourish bacteria and algae, aggravates water eutrophication and increases biofouling of a membrane system, and causes water pollution.
With the increasing awareness of environmental protection of people, the industrial pollution discharge is limited, and the scale inhibitor develops towards the direction of no toxicity, no phosphorus and biodegradability. However, the existing phosphorus-free scale inhibitors generally have the following defects: (1) the existing non-phosphorus scale inhibitor has high use concentration, and the effect of inhibiting calcium carbonate scale and calcium sulfate scale is still not ideal under high concentration, so that the use cost of the non-phosphorus scale inhibitor is overhigh; (2) in the prior art, a stabilizer is added into a phosphorus-free scale inhibitor simply, and the dispersing performance of the stabilizer in the phosphorus-free scale inhibitor is poor, so that the stability of the phosphorus-free scale inhibitor is poor, and the scale inhibition effect of the phosphorus-free scale inhibitor is poor. Based on the statement, the invention provides a phosphorus-free scale inhibitor and a preparation method thereof.
Disclosure of Invention
The invention aims to solve the problems of high use concentration, high use cost, poor stability of a phosphorus-free scale inhibitor, unsatisfactory scale inhibition effect and the like of the phosphorus-free scale inhibitor in the prior art, and provides the phosphorus-free scale inhibitor and a preparation method thereof.
A non-phosphorus scale inhibitor comprises the following raw materials in parts by weight: 20-50 parts of polyaspartic acid, 10-18 parts of modified starch, 3-8 parts of acrylic acid maleic acid copolymer, 1-5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.2-0.6 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 0.5-1.5 parts of sodium stearyl fumarate, 1-3 parts of acryloyloxyethyl trimethyl ammonium chloride and 5-12 parts of composite additive.
Preferably, the phosphorus-free scale inhibitor comprises the following raw materials in parts by weight: 24-40 parts of polyaspartic acid, 12-16 parts of modified starch, 4-7 parts of acrylic acid maleic acid copolymer, 2-4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.3-0.5 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 0.8-1.2 parts of sodium stearyl fumarate, 1.5-2.5 parts of acryloyloxyethyl trimethyl ammonium chloride and 6-10 parts of composite additive.
Preferably, the phosphorus-free scale inhibitor comprises the following raw materials in parts by weight: 35 parts of polyaspartic acid, 14 parts of modified starch, 5.5 parts of acrylic acid maleic acid copolymer, 3 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.4 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 1 part of sodium stearyl fumarate, 2 parts of acryloyloxyethyl trimethyl ammonium chloride and 8 parts of composite additive.
Preferably, the mass ratio of the polyaspartic acid to the modified starch is 2-2.5: 1.
Preferably, the modified starch is prepared by the following method: adding 10 times of water into corn starch, stirring, heating to completely gelatinize, cooling to 18-24 ℃, adding maleic acid and propylene glycol methyl ether acetate, stirring and mixing uniformly, adding polyethylene glycol trimethyl nonyl ether and sodium bicarbonate, stirring and mixing uniformly continuously, heating to 78-88 ℃, keeping the temperature and standing for 1-3h, drying and grinding to obtain the modified starch.
Preferably, the mass ratio of the corn starch to the maleic acid to the propylene glycol methyl ether acetate is 15-23:2-5: 1-3.
Preferably, the mass ratio of the corn starch to the polyethylene glycol trimethyl nonyl ether to the sodium bicarbonate is 10-18:1-2: 3-5.
Preferably, the particle size of the modified starch is 1-100 μm.
Preferably, the compound additive comprises sodium gluconate, sodium lignin sulfonate, tannic acid and isooctyl stearate in a mass ratio of 3:7:1: 1.5.
The invention also provides a preparation method of the phosphorus-free scale inhibitor, which comprises the following steps:
s1, weighing polyaspartic acid, modified starch, acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a compound additive for later use;
s2, adding the weighed polyaspartic acid and modified starch into a reactor together, adding deionized water which is 4-7 times of the total weight of the polyaspartic acid and the modified starch, and heating while stirring until the deionized water is completely dissolved to obtain mixed liquid;
s3, controlling the temperature of the mixed solution in the step S1 to be 62-68 ℃, adding the acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and the compound additive into the mixed solution in sequence while stirring, and stirring and mixing uniformly to obtain the phosphorus-free scale inhibitor.
The phosphorus-free scale inhibitor provided by the invention has the following beneficial effects:
1. the scale inhibitor prepared by the invention is prepared by compounding safe, nontoxic, good-biodegradability and environment-friendly polyaspartic acid and modified starch as main raw materials in proportion, adding water into the main raw materials, mixing, sequentially adding auxiliary materials such as acrylic acid-maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid and the like, and uniformly mixing; the raw materials of the invention are scientific and reasonable in selection, the proportion is strict, the preparation method is simple, the preparation condition is mild, the obtained scale inhibitor has stable performance, low use concentration and excellent scale inhibition performance, has the effects of chelating, dispersing, lattice distortion and the like on scales, can effectively inhibit the formation of the scales, has the calcium carbonate scale inhibition rate and the calcium phosphate scale inhibition rate which are respectively up to 99.20 percent and 99.70 percent, has good corrosion inhibition effect, can effectively prolong the service life of equipment, has excellent comprehensive performance, and can be widely applied.
2. The corn starch is added with water, heated and gelatinized, cooled, added with maleic acid and propylene glycol methyl ether acetate, stirred and uniformly mixed, finally added with polyethylene glycol trimethyl nonyl ether and sodium bicarbonate, continuously uniformly mixed, heated, kept stand, dried and ground to prepare modified starch, and polyaspartic acid and the modified starch are compounded in proportion to serve as main raw materials of the scale inhibitor, so that the adhesiveness and the adsorptivity of the obtained scale inhibitor can be remarkably improved, the obtained scale inhibitor is good in dispersity, free of phosphorus, good in biodegradability, free of secondary pollution to a water body, low in use concentration and remarkable in use effect.
Detailed Description
The present invention will be further illustrated with reference to the following specific examples.
Example one
The invention provides a phosphorus-free scale inhibitor which comprises the following raw materials in parts by weight: 20 parts of polyaspartic acid, 10 parts of modified starch, 3 parts of acrylic acid maleic acid copolymer, 1 part of 2-acrylamido-2-methylpropanesulfonic acid, 0.2 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 0.5 part of sodium stearyl fumarate, 1 part of acryloyloxyethyl trimethyl ammonium chloride and 5 parts of composite additive; the modified starch is prepared by the following method: adding 10 times of water into corn starch, stirring, heating to completely gelatinize, cooling to 18 ℃, adding maleic acid and propylene glycol methyl ether acetate, stirring and mixing uniformly, adding polyethylene glycol trimethyl nonyl ether and sodium bicarbonate, stirring and mixing uniformly continuously, heating to 78 ℃, keeping the temperature, standing for 1h, drying and grinding to obtain modified starch with the particle size of 1 mu m; the mass ratio of the corn starch to the maleic acid to the propylene glycol methyl ether acetate is 15:2: 1; the mass ratio of the corn starch to the polyethylene glycol trimethyl nonyl ether to the sodium bicarbonate is 10:1: 3;
the composite additive comprises sodium gluconate, sodium lignin sulfonate, tannic acid and isooctyl stearate in a mass ratio of 3:7:1: 1.5.
The invention also provides a preparation method of the phosphorus-free scale inhibitor, which comprises the following steps:
s1, weighing polyaspartic acid, modified starch, acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a compound additive for later use;
s2, adding the weighed polyaspartic acid and modified starch into a reactor together, adding deionized water which is 4 times of the total weight of the polyaspartic acid and the modified starch, and stirring while heating until the polyaspartic acid and the modified starch are completely dissolved to obtain mixed liquid;
s3, controlling the temperature of the mixed solution in the step S1 to be 62 ℃, adding the acrylic acid-maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and the compound additive into the mixed solution in sequence while stirring, and stirring and mixing uniformly to obtain the phosphorus-free scale inhibitor.
Example two
The invention provides a phosphorus-free scale inhibitor which comprises the following raw materials in parts by weight: 35 parts of polyaspartic acid, 14 parts of modified starch, 5.5 parts of acrylic acid maleic acid copolymer, 3 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.4 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 1 part of sodium stearyl fumarate, 2 parts of acryloyloxyethyl trimethyl ammonium chloride and 8 parts of composite additive; the modified starch is prepared by the following method: adding 10 times of water into corn starch, stirring, heating to completely gelatinize, cooling to 21 ℃, adding maleic acid and propylene glycol methyl ether acetate, stirring and mixing uniformly, adding polyethylene glycol trimethyl nonyl ether and sodium bicarbonate, stirring and mixing uniformly, heating to 83 ℃, keeping the temperature, standing for 2 hours, drying and grinding to obtain modified starch with the particle size of 50 microns; the mass ratio of the corn starch to the maleic acid to the propylene glycol methyl ether acetate is 19:3.5: 2; the mass ratio of the corn starch to the polyethylene glycol trimethyl nonyl ether to the sodium bicarbonate is 14:1.5: 4;
the composite additive comprises sodium gluconate, sodium lignin sulfonate, tannic acid and isooctyl stearate in a mass ratio of 3:7:1: 1.5.
The invention also provides a preparation method of the phosphorus-free scale inhibitor, which comprises the following steps:
s1, weighing polyaspartic acid, modified starch, acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a compound additive for later use;
s2, adding the weighed polyaspartic acid and modified starch into a reactor together, adding deionized water which is 5.5 times of the total weight of the polyaspartic acid and the modified starch, and stirring while heating until the polyaspartic acid and the modified starch are completely dissolved to obtain mixed liquid;
s3, controlling the temperature of the mixed solution in the step S1 to be 65 ℃, adding the acrylic acid-maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and the compound additive into the mixed solution in sequence while stirring, and stirring and mixing uniformly to obtain the phosphorus-free scale inhibitor.
EXAMPLE III
The invention provides a phosphorus-free scale inhibitor which comprises the following raw materials in parts by weight: 50 parts of polyaspartic acid, 18 parts of modified starch, 8 parts of acrylic acid-maleic acid copolymer, 5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.6 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 1.5 parts of sodium stearyl fumarate, 3 parts of acryloyloxyethyl trimethyl ammonium chloride and 12 parts of composite additive; the modified starch is prepared by the following method: adding 10 times of water into corn starch, stirring, heating to completely gelatinize, cooling to 24 ℃, adding maleic acid and propylene glycol methyl ether acetate, stirring and mixing uniformly, adding polyethylene glycol trimethyl nonyl ether and sodium bicarbonate, stirring and mixing uniformly continuously, heating to 88 ℃, keeping the temperature, standing for 3 hours, drying and grinding to obtain modified starch with the particle size of 100 microns; the mass ratio of the corn starch to the maleic acid to the propylene glycol methyl ether acetate is 23:5: 3; the mass ratio of the corn starch to the polyethylene glycol trimethyl nonyl ether to the sodium bicarbonate is 18:2: 5;
the composite additive comprises sodium gluconate, sodium lignin sulfonate, tannic acid and isooctyl stearate in a mass ratio of 3:7:1: 1.5.
The invention also provides a preparation method of the phosphorus-free scale inhibitor, which comprises the following steps:
s1, weighing polyaspartic acid, modified starch, acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a compound additive for later use;
s2, adding the weighed polyaspartic acid and modified starch into a reactor together, adding deionized water which is 7 times of the total weight of the polyaspartic acid and the modified starch, and stirring while heating until the polyaspartic acid and the modified starch are completely dissolved to obtain mixed liquid;
s3, controlling the temperature of the mixed solution in the step S1 to be 68 ℃, adding the acrylic acid-maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and the compound additive into the mixed solution in sequence while stirring, and stirring and mixing uniformly to obtain the phosphorus-free scale inhibitor.
Comparative example 1
The invention provides a phosphorus-free scale inhibitor which comprises the following raw materials in parts by weight: 20 parts of polyaspartic acid, 10 parts of starch, 3 parts of acrylic acid maleic acid copolymer, 1 part of 2-acrylamido-2-methylpropanesulfonic acid, 0.2 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 0.5 part of sodium stearyl fumarate, 1 part of acryloyloxyethyl trimethyl ammonium chloride and 5 parts of composite additive;
the composite additive comprises sodium gluconate, sodium lignin sulfonate, tannic acid and isooctyl stearate in a mass ratio of 3:7:1: 1.5.
The invention also provides a preparation method of the phosphorus-free scale inhibitor, which comprises the following steps:
s1, weighing polyaspartic acid, modified starch, acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a compound additive for later use;
s2, adding the weighed polyaspartic acid and modified starch into a reactor together, adding deionized water which is 4 times of the total weight of the polyaspartic acid and the modified starch, and stirring while heating until the polyaspartic acid and the modified starch are completely dissolved to obtain mixed liquid;
s3, controlling the temperature of the mixed solution in the step S1 to be 62 ℃, adding the acrylic acid-maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and the compound additive into the mixed solution in sequence while stirring, and stirring and mixing uniformly to obtain the phosphorus-free scale inhibitor.
The phosphorus-free scale inhibitor prepared in the first to third embodiments of the invention and the first comparative example is used for treating industrial circulating water, and the following results are obtained:
table 1:
| example one | Example two | EXAMPLE III | Comparative example 1 | |
| Calcium carbonate scale inhibition ratio (%) | 98.90 | 99.20 | 99.00 | 87.3 |
| Calcium phosphate scale inhibition ratio (%) | 99.45 | 99.70 | 99.60 | 90.36 |
| Biodegradation Rate after 1 month (%) | 83.6 | 85.90 | 84.5 | 78.80 |
Controlling the total amount of the polyaspartic acid and the modified starch to be 30 parts by weight, respectively setting only polyaspartic acid or modified starch, wherein the mass ratio of the polyaspartic acid to the modified starch is 1:1, 1.5:1, 2:1, 2.5:1 and 3:1, the weight parts of other raw materials and the preparation method of the scale inhibitor are completely the same as those of the embodiment, preparing the scale inhibitor, and respectively using the scale inhibitor for industrial circulating water treatment to obtain the following results:
table 2:
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A non-phosphorus scale inhibitor is characterized by comprising the following raw materials in parts by weight: 20-50 parts of polyaspartic acid, 10-18 parts of modified starch, 3-8 parts of acrylic acid maleic acid copolymer, 1-5 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.2-0.6 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 0.5-1.5 parts of sodium stearyl fumarate, 1-3 parts of acryloyloxyethyl trimethyl ammonium chloride and 5-12 parts of composite additive.
2. The phosphorus-free scale inhibitor according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 24-40 parts of polyaspartic acid, 12-16 parts of modified starch, 4-7 parts of acrylic acid maleic acid copolymer, 2-4 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.3-0.5 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 0.8-1.2 parts of sodium stearyl fumarate, 1.5-2.5 parts of acryloyloxyethyl trimethyl ammonium chloride and 6-10 parts of composite additive.
3. The phosphorus-free scale inhibitor according to claim 1, which is characterized by comprising the following raw materials in parts by weight: 35 parts of polyaspartic acid, 14 parts of modified starch, 5.5 parts of acrylic acid maleic acid copolymer, 3 parts of 2-acrylamido-2-methylpropanesulfonic acid, 0.4 part of 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, 1 part of sodium stearyl fumarate, 2 parts of acryloyloxyethyl trimethyl ammonium chloride and 8 parts of composite additive.
4. The phosphorus-free scale inhibitor according to claim 1, wherein the mass ratio of the polyaspartic acid to the modified starch is 2-2.5: 1.
5. The phosphorus-free scale inhibitor according to claim 1, wherein the modified starch is prepared by the following method: adding 10 times of water into corn starch, stirring, heating to completely gelatinize, cooling to 18-24 ℃, adding maleic acid and propylene glycol methyl ether acetate, stirring and mixing uniformly, adding polyethylene glycol trimethyl nonyl ether and sodium bicarbonate, stirring and mixing uniformly continuously, heating to 78-88 ℃, keeping the temperature and standing for 1-3h, drying and grinding to obtain the modified starch.
6. The phosphorus-free scale inhibitor of claim 5, wherein the mass ratio of the corn starch, the maleic acid and the propylene glycol methyl ether acetate is 15-23:2-5: 1-3.
7. The phosphorus-free scale inhibitor of claim 5, wherein the mass ratio of the corn starch, the polyethylene glycol trimethyl nonyl ether and the sodium bicarbonate is 10-18:1-2: 3-5.
8. The phosphorus-free scale inhibitor according to claim 5, wherein the particle size of the modified starch is 1-100 μm.
9. The phosphorus-free scale inhibitor of claim 1, wherein the composite additive comprises sodium gluconate, sodium lignosulfonate, tannic acid and isooctyl stearate in a mass ratio of 3:7:1: 1.5.
10. A method for preparing the phosphorus-free scale inhibitor according to any one of claims 1 to 9, comprising the steps of:
s1, weighing polyaspartic acid, modified starch, acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and a compound additive for later use;
s2, adding the weighed polyaspartic acid and modified starch into a reactor together, adding deionized water which is 4-7 times of the total weight of the polyaspartic acid and the modified starch, and heating while stirring until the deionized water is completely dissolved to obtain mixed liquid;
s3, controlling the temperature of the mixed solution in the step S1 to be 62-68 ℃, adding the acrylic acid maleic acid copolymer, 2-acrylamide-2-methylpropanesulfonic acid, 1,3, 5-triazine-2, 4,6(1H,3H,5H) -trithione trisodium salt, sodium stearyl fumarate, acryloyloxyethyl trimethyl ammonium chloride and the compound additive into the mixed solution in sequence while stirring, and stirring and mixing uniformly to obtain the phosphorus-free scale inhibitor.
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