CN111533286B - Composite slow-release environment-friendly scale inhibitor and preparation method thereof - Google Patents
Composite slow-release environment-friendly scale inhibitor and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- 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
- C02F5/105—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 combined with inorganic substances
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- C08B37/0024—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Glucans; (beta-1,3)-D-Glucans, e.g. paramylon, coriolan, sclerotan, pachyman, callose, scleroglucan, schizophyllan, laminaran, lentinan or curdlan; (beta-1,6)-D-Glucans, e.g. pustulan; (beta-1,4)-D-Glucans; (beta-1,3)(beta-1,4)-D-Glucans, e.g. lichenan; Derivatives thereof
- C08B37/0027—2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof
- C08B37/003—Chitin, i.e. 2-acetamido-2-deoxy-(beta-1,4)-D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan, i.e. deacetylated product of chitin or (beta-1,4)-D-glucosamine; Derivatives thereof
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Abstract
The invention belongs to the technical field of scale inhibitor manufacturing, relates to a scale inhibitor, and particularly relates to a composite slow-release environment-friendly scale inhibitor and a preparation method thereof, wherein the scale inhibitor comprises the following components in parts by weight: 55-80 parts of main scale inhibitor, 15-40 parts of adhesive and 5-20 parts of water, wherein the main scale inhibitor is prepared by reacting 1 part of low-substitution-degree carboxylated chitosan, 0.5-2 parts of polyphosphate and 0.05-4 parts of acid in water, and the mass concentration of the acid is 5-30%. The composite slow-release environment-friendly scale inhibitor provided by the invention has the advantages of good scale inhibition effect, small using amount, long service life, low cost of the scale inhibitor, simple and safe preparation method, suitability for the field of household and industrial water treatment and good economic use value.
Description
Technical Field
The invention belongs to the technical field of scale inhibitor manufacturing, relates to a scale inhibitor, and particularly relates to a composite slow-release environment-friendly scale inhibitor and a preparation method thereof.
Background
At present, industrial water and domestic water contain a large amount of calcium and magnesium cations, carbonate, sulfate radicals and other anions, and the interaction of the anions forms scale substances which can influence the heat transfer of machine equipment, cause the blockage of pipelines and equipment and influence the service life of the equipment and electric appliances. For example, water heaters, heating pipelines and reverse osmosis water purifiers have the condition that the service life of electric appliances is obviously shortened due to scaling of equipment in high-hardness areas.
The scale inhibitor has the functions of dispersing the insoluble inorganic salt in water and preventing and interfering the scaling of the insoluble inorganic salt. At present, a plurality of scale inhibitors are available on the market, but most of the scale inhibitors are liquid, are inconvenient to use in household equipment, and need specific equipment for addition. A small number of solid scale inhibitors have high solubility in water, and when the water consumption of customers is high, the scale inhibitors are used in a large amount, so that the scale inhibitors need to be frequently added, and great inconvenience is brought to the customers.
In view of the defects of the existing scale inhibitor, the inventor of the invention actively researches and innovates based on the practical experience and professional knowledge which is abundant for many years in the design and manufacture of the product and by matching with the application of the theory, so as to create a composite slow-release environment-friendly scale inhibitor and a preparation method thereof, and the composite slow-release environment-friendly scale inhibitor has the advantages of slow release function and good low-concentration scale inhibition effect. After continuous research and design and repeated trial production and improvement, the invention with practical value is finally created.
Disclosure of Invention
The first purpose of the invention is to provide a composite slow-release environment-friendly scale inhibitor which has the advantages of slow release function, low concentration and good scale inhibition effect and has industrial value.
The technical purpose of the invention is realized by the following technical scheme:
the invention provides a composite slow-release environment-friendly scale inhibitor, which comprises the following components in parts by weight: 55-80 parts of main scale inhibitor, 15-40 parts of adhesive and 5-20 parts of water, wherein the main scale inhibitor is prepared by reacting 1 part of low-substitution-degree carboxylated chitosan, 0.5-2 parts of polyphosphate and 0.05-4 parts of acid in water, and the mass concentration of the acid is 5-30%. The chitosan is prepared by removing N-acetyl from precursor chitin, the chitin is insoluble in acid, alkali and water, but the deacetylated product chitosan has slight water solubility, the solubility of the chitosan in water is improved by performing carboxylation modification on hydroxyl or amino on 2-C, 3-C or 6-C positions of the chitosan, and meanwhile, carboxyl groups are introduced, have good chelating capacity on calcium and magnesium ions in water, and can greatly improve the scale inhibition capacity of the chitosan; meanwhile, the low-solubility characteristic of chitosan is kept through low substitution degree, the slow release purpose is achieved, main production raw materials of the scale inhibitor provided by the invention are all food-grade, the scale inhibitor is good in safety, wide in source and low in cost, can be used in the household field, has little influence on water quality in the use process, is soaked for 24 hours in an MOH (metal oxide hydrogen) soaking mode, and the TDS (total dissolved solids) change of raw water is less than 10.
Further, the acid is one or a mixture of several of hydrochloric acid, sulfuric acid, phosphoric acid and acetic acid.
Further, the mass concentration of the acid is 5 to 30%.
Further, the carboxylated chitosan with low substitution degree is modified by acid.
Further, the preparation raw materials of the carboxylated chitosan with low degree of substitution comprise the following components in parts by weight: 1 part of chitosan, 0.5-3 parts of alkali, 3-20 parts of isopropanol and 0.05-4 parts of acid.
Further, the acid is one or a mixture of more of chloroacetic acid, oxalic acid or sulfamic acid.
Further, chloroacetic acid is 50% aqueous chloroacetic acid solution by mass concentration.
Further, the polyphosphate is one or a mixture of more of sodium tripolyphosphate, calcium tripolyphosphate, zinc tripolyphosphate, aluminum tripolyphosphate or sodium hexametaphosphate. According to the invention, through the reaction of modified chitosan and polyphosphate, phosphate groups are introduced, and the phosphate groups have certain scale inhibition performance and form conjugated large pi bonds with carboxyl groups to form a synergistic effect, so that the scale inhibition effect of the main scale inhibitor is further improved, the good scale inhibition effect under low mass concentration is realized, the good scale inhibition effect is realized for tap water with different hardness, more than 15 tons of raw water can be treated by 10g of the scale inhibitor, the scale inhibition rate is more than 80%, and the good unification of safety, low solubility and high scale inhibition effect is realized.
Further, the alkali is one or a mixture of two of sodium hydroxide and potassium hydroxide, wherein the mass concentration of the sodium hydroxide and the potassium hydroxide is 8-40%.
Furthermore, the adhesive is one or a mixture of more of microcrystalline cellulose, hydroxymethyl cellulose, powdered polyethylene or epoxy resin. The release rate of the scale inhibitor is controlled by the compounding mode of the main scale inhibitor and the adhesive, the dosage of the scale inhibitor can be greatly reduced, the long-acting scale inhibition effect is realized, the solubility of the scale inhibitor in water is controlled by controlling the substitution degree of carboxylation of chitosan and the proportion of the adhesive and the main scale inhibitor, and the service life of the scale inhibitor is prolonged while the scale inhibition effect is ensured; during the use process, the solubility of the whole scale inhibitor in water is less than 10mg/L.
The invention also aims to provide a preparation method of the composite slow-release environment-friendly scale inhibitor, which has the same effect.
The technical effects of the invention are realized by the following technical scheme:
the preparation method of the composite slow-release environment-friendly scale inhibitor provided by the invention comprises the following operation steps:
s1, preparing low-substitution-degree carboxylated chitosan, adding chitosan, alkali and isopropanol into a reaction kettle, uniformly stirring, adding acid for reaction, adjusting the pH value of a reaction solution to be neutral by using hydrochloric acid after the reaction is finished, and precipitating by using ethanol to obtain low-substitution-degree modified chitosan;
s2, preparing a main scale inhibitor, washing the low-substitution-degree modified chitosan with deionized water for 2 times, and filtering; adding the filter cake, an acid solution and deionized water into a reactor, uniformly stirring in a water bath kettle at 50 ℃, adding polyphosphate after chitosan is fully dissolved, adjusting the pH to be neutral by using an alkali liquor after the reaction is finished, cooling to room temperature, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing the composite slow-release environment-friendly scale inhibitor, namely uniformly mixing the main scale inhibitor pre-dried in the step S2 with an adhesive and water, extruding, granulating and drying to obtain the environment-friendly composite slow-release scale inhibitor.
Preferably, the preparation method of the composite slow-release environment-friendly scale inhibitor comprises the following steps:
s1, adding chitosan, sodium hydroxide and isopropanol into a reaction kettle according to a certain specific proportion, and starting stirring; stirring for a certain time, adding chloroacetic acid in a certain proportion for reaction, and beginning to calculate the reaction time; after the reaction is finished, adjusting the pH value of the reaction solution to be neutral by using hydrochloric acid; finally, precipitating by using ethanol to prepare the modified chitosan with low substitution degree;
s2, washing the low-substitution-degree modified chitosan obtained in the step S1 with deionized water for 2 times, and filtering; adding a filter cake, a hydrochloric acid solution and a proper amount of deionized water into a reactor according to a certain proportion, starting stirring, adjusting the temperature of a water bath to 50 ℃, adding polyphosphate after chitosan is fully dissolved, heating to a reaction temperature, adjusting the pH to be neutral by using an alkali liquor after reacting for a certain time, cooling, filtering, discharging, washing by using pure water, and pre-drying for later use;
and S3, uniformly mixing the pre-dried main scale inhibitor obtained in the step S2 with a certain amount of adhesive and water, extruding, granulating and drying to obtain the composite slow-release environment-friendly scale inhibitor.
Preferably, in step S1, the reaction time in the reaction vessel is 0.5 to 1.5 hours and the reaction temperature is 30 to 50 ℃.
Preferably, in step S2, the reaction time in the reactor is 1 to 2 hours and the reaction temperature is 50 to 90 ℃.
In conclusion, the invention has the following beneficial effects:
the composite slow-release environment-friendly scale inhibitor provided by the invention is a solid long-acting scale inhibitor, has the advantages of good scale inhibition effect, small using amount, long service life, low cost of the scale inhibitor, simple and safe preparation method, is suitable for the field of household and industrial water treatment, and has good economic use value.
Detailed Description
To further illustrate the technical means and effects adopted by the invention to achieve the predetermined invention purpose, the detailed description of the specific implementation mode, characteristics and effects of the composite slow-release environment-friendly scale inhibitor and the preparation method thereof provided by the invention is as follows.
Example 1: composite slow-release environment-friendly scale inhibitor and preparation method thereof
The composite slow-release environment-friendly scale inhibitor comprises the following components in parts by weight: 80 parts of main scale inhibitor, 15 parts of microcrystalline cellulose and 5 parts of water.
The preparation method comprises the following steps:
s1, preparing low-substitution-degree carboxylated chitosan: adding 10g of chitosan, 12.5g of sodium hydroxide with the mass concentration of 40% and 100g of isopropanol into a reactor, starting stirring, after stirring for 30min, adding 10g of chloroacetic acid with the mass concentration of 50%, controlling the reaction in a water bath at 40 ℃, adjusting the pH of a reaction solution to be neutral by using a hydrochloric acid solution after reacting for 1h, and finally precipitating by using ethanol to obtain the low-substitution-degree modified chitosan;
s2, preparing a main scale inhibitor: washing the low-substitution-degree modified chitosan obtained in the step S1 with deionized water for 2 times, and filtering; weighing 100g of filter cake, 100g of phosphoric acid with the mass concentration of 20% and 200ml of deionized water, adding the phosphoric acid and the deionized water into a reactor, starting stirring, adjusting the temperature of a water bath to 50 ℃, adding 100g of sodium tripolyphosphate after chitosan is fully dissolved, adjusting the stirring rate to 250r/min, controlling the reaction temperature to be 90 ℃, reacting for 1h, adjusting the pH to be neutral by using a NaOH solution with the mass concentration of 10%, cooling, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing the composite slow-release environment-friendly scale inhibitor: and (3) uniformly mixing 80 parts of the main scale inhibitor pre-dried in the step (S2), 15 parts of microcrystalline cellulose and 5 parts of water, extruding, granulating and drying by using a single-screw extruder to obtain the environment-friendly composite slow-release scale inhibitor.
Example 2: environment-friendly composite slow-release scale inhibitor and preparation method thereof
An environment-friendly composite slow-release scale inhibitor comprises the following components in parts by weight: 55 parts of main scale inhibitor, 25 parts of powdered polyethylene and 20 parts of water.
The preparation method comprises the following steps:
s1, preparing low-substitution-degree carboxylated chitosan: adding 10g of chitosan, 20g of sodium hydroxide with the mass concentration of 40% and 150g of isopropanol into a reactor, starting stirring, after stirring for 30min, adding 16g of chloroacetic acid with the mass concentration of 50%, controlling the reaction at 40 ℃ in a water bath, adjusting the pH of a reaction solution to be neutral by using a hydrochloric acid solution after reacting for 1h, and finally precipitating by using ethanol to obtain the low-substitution-degree modified chitosan;
s2, preparing a main scale inhibitor: washing the low-substitution-degree modified chitosan obtained in the step S1 with deionized water for 2 times, and filtering; weighing 100g of filter cake, 100g of sulfuric acid with the mass concentration of 10% and 200ml of deionized water, adding the filter cake and the deionized water into a reactor, starting stirring, adjusting the temperature of a water bath to 50 ℃, adding 150g of calcium tripolyphosphate after chitosan is fully dissolved, adjusting the stirring rate to 250r/min, controlling the reaction temperature to be 75 ℃, reacting for 1h, adjusting the pH to be neutral by using a NaOH solution with the mass concentration of 10%, cooling, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing the composite slow-release environment-friendly scale inhibitor: and (3) uniformly mixing 55 parts of the main scale inhibitor pre-dried in the step (S2), 25 parts of powdered polyethylene and 20 parts of water, extruding, granulating and drying by using a single-screw extruder to obtain the environment-friendly composite slow-release scale inhibitor.
Example 3: environment-friendly composite slow-release scale inhibitor and preparation method thereof
An environment-friendly composite slow-release scale inhibitor comprises the following components in parts by weight: 55 parts of main scale inhibitor, 30 parts of powdered polyethylene and 15 parts of water.
The preparation method comprises the following steps:
s1, preparing low-substitution-degree carboxylated chitosan: adding 10g of chitosan, 50g of sodium hydroxide with the mass concentration of 40% and 80g of isopropanol into a reactor, starting stirring, after stirring for 30min, adding 20g of chloroacetic acid with the mass concentration of 50%, controlling the reaction in a water bath at 50 ℃, adjusting the pH of the reaction solution to be neutral by using a hydrochloric acid solution after reacting for 1.5h, and finally precipitating by using ethanol to obtain the low-substitution-degree modified chitosan.
S2, preparing a main scale inhibitor: washing the low-substitution-degree modified chitosan obtained in the step S1 with deionized water for 2 times, and filtering; weighing 100g of filter cake, 200g of hydrochloric acid with the mass concentration of 10% and 100ml of deionized water, adding the filter cake and the deionized water into a reactor, starting stirring, adjusting the temperature of a water bath to 50 ℃, adding 200g of aluminum tripolyphosphate after chitosan is fully dissolved, adjusting the stirring rate to 300r/min, controlling the reaction temperature to 90 ℃, reacting for 1h, adjusting the pH to be neutral by using 10% by mass of KOH solution, cooling, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing a composite slow-release environment-friendly scale inhibitor: and (3) uniformly mixing 55 parts of the main scale inhibitor pre-dried in the step (S2), 30 parts of powdered polyethylene and 15 parts of water, extruding, granulating and drying by using a single-screw extruder to obtain the environment-friendly composite slow-release scale inhibitor.
Example 4: environment-friendly composite slow-release scale inhibitor and preparation method thereof
An environment-friendly composite slow-release scale inhibitor comprises the following components in parts by weight: 60 parts of a main scale inhibitor, 25 parts of hydroxymethyl cellulose and 15 parts of water.
The preparation method comprises the following steps:
s1, preparing low-substitution-degree carboxylated chitosan: adding 10g of chitosan, 50g of sodium hydroxide with the mass concentration of 40% and 70g of isopropanol into a reactor, starting stirring, after stirring for 30min, adding 16g of chloroacetic acid with the mass concentration of 50%, controlling the reaction at 50 ℃ in a water bath, adjusting the pH of the reaction solution to be neutral by using a hydrochloric acid solution after reacting for 1.5h, and finally precipitating by using ethanol to obtain the low-substitution-degree modified chitosan.
S2, preparing a main scale inhibitor: washing the low-substitution-degree modified chitosan obtained in the step S1 with deionized water for 2 times, and filtering; weighing 100g of filter cake, 200g of hydrochloric acid with the mass concentration of 10% and 100ml of deionized water, adding the filter cake and the hydrochloric acid into a reactor, starting stirring, adjusting the temperature of a water bath to 50 ℃, adding 200g of sodium hexametaphosphate after chitosan is fully dissolved, adjusting the stirring rate to 350r/min, controlling the reaction temperature to 80 ℃, reacting for 1h, adjusting the pH to be neutral by using a NaOH solution with the mass concentration of 10%, cooling, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing the composite slow-release environment-friendly scale inhibitor: and (3) uniformly mixing 60 parts of the main scale inhibitor pre-dried in the step (S2), 25 parts of hydroxymethyl cellulose and 15 parts of water, extruding, granulating and drying by using a single-screw extruder to obtain the environment-friendly composite slow-release scale inhibitor.
Example 5: environment-friendly composite slow-release scale inhibitor and preparation method thereof
An environment-friendly composite slow-release scale inhibitor comprises the following components in parts by weight: 60 parts of main scale inhibitor, 20 parts of epoxy resin and 20 parts of water.
The preparation method comprises the following steps:
s1, preparing low-substitution-degree carboxylated chitosan: adding 10g of chitosan, 25g of sodium hydroxide with the mass concentration of 40% and 150g of isopropanol into a reactor, starting stirring, stirring for 30min, adding 16g of oxalic acid with the mass concentration of 50%, controlling the reaction at 45 ℃ in a water bath, reacting for 1h, regulating the pH of a reaction solution to be neutral by using a hydrochloric acid solution, and finally precipitating by using ethanol to obtain the low-substitution-degree modified chitosan.
S2, preparing a main scale inhibitor: washing the low-substitution-degree modified chitosan obtained in the step S1 with deionized water for 2 times, and filtering; weighing 100g of filter cake, 100g of hydrochloric acid with the mass concentration of 10% and 200ml of deionized water, adding the filter cake and the deionized water into a reactor, starting stirring, adjusting the temperature of a water bath to 50 ℃, adding 200g of sodium tripolyphosphate after chitosan is fully dissolved, adjusting the stirring speed to 300r/min, controlling the reaction temperature to 80 ℃, reacting for 1h, adjusting the pH to be neutral by using a NaOH solution with the mass concentration of 10%, cooling, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing the composite slow-release environment-friendly scale inhibitor: and (3) uniformly mixing 60 parts of the main scale inhibitor pre-dried in the step (S2), 20 parts of epoxy resin and 20 parts of water, extruding, granulating and drying by using a single-screw extruder to obtain the environment-friendly composite slow-release scale inhibitor.
Comparative example: silicon-phosphorus crystal (vitreous pellets made by baking active ingredient raw materials such as soda, phosphoric acid, calcium carbonate and the like at high temperature of 1200-1700 ℃ C.)
Examples 1 to 5 and the control were tested according to the following specific test procedures:
firstly, weighing a mixture with the mass ratio of 4:5 calcium chloride and sodium bicarbonate, hard water with a hardness of about 500ppm was prepared, 500ml of each of the hard water was added to a number 1-7 Erlenmeyer flask, and the scale inhibitor prepared in example 1, example 2, example 3, example 4 and example 5 and 0.1g of each of the comparative examples were weighed and added to a number 1-6 Erlenmeyer flask, and No. 7 was a blank group. Sealing the preservative film of No. 1-7 conical bottles to prevent water evaporation, carrying out water bath at 80 ℃ for 24h, testing the water hardness before and after the water bath (the hardness before the water bath is P1, the hardness after the water bath is P2, and the hardness after the blank group is P3), and calculating the scale inhibition rate of each scale inhibitor. The solubility of the scale inhibitor is tested by testing the carboxyl content and the total phosphorus mass concentration of No. 6 in the water after No. 1-5 water baths. Scale inhibition rate = (P2-P3)/(P1-P3) × 100%, the relevant test results are shown in table 1:
TABLE 1 Scale inhibition Rate test results
As shown in table 1, the composite slow-release scale inhibitor prepared by the invention has low solubility in water, good slow-release effect and good scale inhibition effect at low concentration.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. The composite slow-release environment-friendly scale inhibitor is characterized by comprising the following components in parts by weight: 55-80 parts of a main scale inhibitor, 15-40 parts of an adhesive and 5-20 parts of water, wherein the main scale inhibitor is prepared by reacting 1 part of low-substitution-degree carboxylated chitosan, 0.5-2 parts of polyphosphate and 0.05-4 parts of acid in water; adding low-substitution-degree carboxylated chitosan, an acid solution and deionized water into a reactor, uniformly stirring in a water bath kettle at 50 ℃, adding polyphosphate after the chitosan is fully dissolved, adjusting the pH to be neutral by using an alkali solution after the reaction is finished, filtering and discharging after the reaction is cooled to room temperature, washing by using pure water, and pre-drying for later use; the low-substitution-degree carboxylated chitosan is prepared by introducing carboxyl on chitosan through acid modification, chelating carboxyl groups with calcium and magnesium ions in water, and improving the scale inhibition capability of the low-substitution-degree carboxylated chitosan, wherein the adhesive is one or a mixture of microcrystalline cellulose, hydroxymethyl cellulose, powdered polyethylene or epoxy resin.
2. The composite slow-release environment-friendly scale inhibitor as claimed in claim 1, wherein the acid in the preparation of the main scale inhibitor is one or a mixture of hydrochloric acid, sulfuric acid, phosphoric acid or acetic acid, and the mass concentration of the acid is 5 to 30%.
3. The composite slow-release environment-friendly scale inhibitor according to claim 1, characterized in that the preparation raw materials of the low-substitution carboxylated chitosan comprise the following components in parts by weight: 1 part of chitosan, 0.5 to 4 parts of alkali, 3 to 20 parts of isopropanol and 0.2 to 1 part of acid.
4. The composite slow-release environment-friendly scale inhibitor according to claim 3, wherein the acid in the acid modification is one or a mixture of more of sulfamic acid, chloroacetic acid or oxalic acid.
5. The composite slow-release environment-friendly scale inhibitor as claimed in claim 1, wherein the polyphosphate is one or a mixture of more of sodium tripolyphosphate, calcium tripolyphosphate, zinc tripolyphosphate, aluminum tripolyphosphate and sodium hexametaphosphate.
6. The composite slow-release environment-friendly scale inhibitor as claimed in claim 3, wherein the alkali in the raw material for preparing the low-substitution-degree carboxylated chitosan is one or a mixture of sodium hydroxide or potassium hydroxide.
7. A preparation method of a composite slow-release environment-friendly scale inhibitor, which is used for preparing the composite slow-release environment-friendly scale inhibitor disclosed by claim 1, is characterized by comprising the following operation steps of:
s1, preparing low-substitution-degree carboxylated chitosan, adding chitosan, alkali and isopropanol into a reaction kettle, uniformly stirring, adding acid for reaction, adjusting the pH value of a reaction solution to be neutral by using hydrochloric acid after the reaction is finished, and precipitating by using ethanol to obtain low-substitution-degree modified chitosan;
s2, preparing a main scale inhibitor, washing the low-substitution-degree modified chitosan with deionized water for 2 times, and filtering; adding the filter cake, an acid solution and deionized water into a reactor, uniformly stirring in a water bath kettle at 50 ℃, adding polyphosphate after chitosan is fully dissolved, adjusting the pH to be neutral by using an alkali liquor after the reaction is finished, cooling to room temperature, filtering, discharging, washing by using pure water, and pre-drying for later use;
s3, preparing a composite slow-release environment-friendly scale inhibitor, namely uniformly mixing the main scale inhibitor pre-dried in the step S2 with a binder and water, extruding, granulating and drying to obtain the composite slow-release environment-friendly scale inhibitor.
8. The preparation method of the composite slow-release environment-friendly scale inhibitor according to claim 7, wherein in the step S1, the reaction time in the reaction kettle is 0.5 to 1.5 hours, and the reaction temperature is 30 to 50 ℃; in the step S2, the reaction time in the reactor is 1-2h, and the reaction temperature is 50-90 ℃.
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