CN107986462A - A kind of air for air conditioning in textile factories circulation antisludging agent and preparation method thereof - Google Patents

Abstract

The invention discloses a scale inhibitor for the air-conditioning circulating water system of a textile factory. The scale inhibitor is made of three monomers, itaconic acid, sodium allyl sulfonate and hydroxyethyl methacrylate, and is combined with a free radical solution. Terpolymer scale inhibitor containing sulfonic acid group, carboxylic acid group, hydroxyl group and ester group synthesized by polymerization reaction. The antiscalant of the invention solves the problems of low antiscaling efficiency and complicated preparation process of the antiscalant in the prior art. The invention also discloses a preparation method of the scale inhibitor for the air conditioning circulating water system of the textile factory.

Description

A kind of antiscalant of textile factory air conditioning circulating water system and preparation method thereof

technical field

The invention belongs to the technical field of water treatment chemicals, and relates to a scale inhibitor for an air-conditioning circulating water system in a textile mill, and also relates to a preparation method of the scale inhibitor.

Background technique

At present, in many industrial productions, circulating cooling water is almost accompanied by the whole process of production and plays a very important role. A good circulating water system is the prerequisite for the stable operation of the production equipment of the enterprise. Spraying systems are widely used in textile enterprises to treat the indoor air in textile workshops. The spraying room sprays water at different temperatures into mist droplets that directly contact the air for heat and moisture exchange. The water spray room mostly adopts secondary spray and evaporative cooling, and uses circulating water. However, with the continuous operation of the spray air conditioning system and the accumulation of time, the hardness and alkalinity of the circulating water increase under high concentration ratios, causing equipment and pipeline scaling, which increases the resistance of the pipeline and eventually leads to a decrease in the operating efficiency of the system. Therefore, the scale-forming chemical substances cannot be completely filtered out only by a simple filtration method, and some chemical methods are required, that is, the use of scale inhibitors. At present, the use of phosphorus-containing copolymer scale inhibitors is greatly restricted due to the presence of phosphorus. Phosphorus-free formulations of organic polymer scale inhibitors are gradually being widely promoted. Phosphorus-free scale inhibitors with good development effects conform to the development needs. However, at the current technical level, adding unsaturated carboxylic acid ester to the system can modify the copolymer of unsaturated carboxylic acid to a certain extent, and can improve the scale inhibition and dispersion performance of the copolymer.

Contents of the invention

The object of the present invention is to provide a scale inhibitor for the air-conditioning circulating water system of a textile mill, which solves the problems of low scale inhibition efficiency and complicated preparation process of the scale inhibitor in the prior art.

The present invention also provides a preparation method of the above scale inhibitor.

The technical solution adopted in the present invention is, a kind of antiscalant of air-conditioning circulating water system of textile factory, and this antiscalant is made of three monomers of itaconic acid, sodium allyl sulfonate and hydroxyethyl methacrylate as raw materials, A terpolymer scale inhibitor containing sulfonic acid groups, carboxylic acid groups, hydroxyl groups, and ester groups synthesized by free radical solution copolymerization.

The first technical solution of the present invention is also characterized in that,

The structural formula of terpolymer antiscalant is:

Wherein, m, n, y represent respectively the molar mass of itaconic acid, sodium allyl sulfonate, hydroxyethyl methacrylate in the copolymer, m:n:y=(1.5～4.5):1:(0.4～ 1.0).

The second technical solution adopted in the present invention is to prepare a method for scale inhibitor of the air-conditioning circulating water system in textile mills, which is specifically implemented according to the following steps:

Step 1, weigh the following components according to mass percentage: itaconic acid 2.91%-5.11%, allyl sodium sulfonate 1.26%-1.29%, hydroxyethyl methacrylate 0.45%-0.92%, initiator 0.44% ~0.83%, molecular regulator 0.51%~0.68%, distilled water 91.69%~93.92%, the sum of the mass percentages of the above components is 100%;

Step 2, mix the itaconic acid, sodium allyl sulfonate, hydroxyethyl methacrylate, molecular regulator and distilled water weighed in step 1, carry out magnetic stirring until the solids are completely dissolved, and heat to a certain temperature while magnetic stirring temperature, to obtain the mixture a;

Step 3: Add the initiator weighed in step 1 dropwise to the mixed liquid a in step 2, keep it warm for 1.5-3 hours after the addition is completed, then cool to room temperature, and then adjust the pH value to 5-5 with potassium hydroxide solution. 7. Obtain a light yellow transparent liquid, namely the mixed liquid b;

Step 4, add absolute ethanol to the mixed solution b obtained in step 3 for precipitation, and vacuum-dry the precipitate under reduced pressure to obtain a scale inhibitor.

The second technical solution of the present invention is also characterized in that,

The molecular regulator is tert-butanol.

The initiator is ammonium persulfate.

Step 2 is to add the itaconic acid, sodium allyl sulfonate, hydroxyethyl methacrylate, molecular modifier and distilled water weighed in step 1 into a three-necked flask, and fix the three-necked flask on a constant temperature heating magnetic stirrer. Stir with a stirrer and heat to 75°C to 90°C.

In step 3, use a constant pressure dropping funnel to add the initiator dropwise to the mixed solution a.

The ethanol in step 4 is 95% dehydrated ethanol, and its addition amount is 2～3 times of the total volume of mixed solution b.

The beneficial effects of the present invention are: the antiscalant for the circulating water system of the air conditioner in textile mills overcomes the problems of low antiscalant efficiency, complex preparation process and serious environmental pollution of existing antiscalant agents, and effectively solves the problems of spraying air conditioning systems in textile mills. And the scale problem of circulating water pipeline, reduce pipeline resistance, prolong the service life of equipment, improve system operation efficiency, reduce the harm to environment simultaneously; The carboxyl group in the antiscalant of the present invention has stronger to calcium ion Chelating ability, increase the solubility of inorganic salts, and inhibit the formation of calcium carbonate and calcium sulfate scale; the hydroxyl group distorts the crystal structure, reduces the crystal growth rate, and keeps it in a good uniform dispersion state; the sulfonic acid group has a strong affinity Water-based, which improves the tolerance to divalent cations; ester group is to modify the unsaturated carboxylic acid copolymer, thereby improving the scale inhibition performance. In addition, the scale inhibitor of the present invention is a scale inhibitor suitable for air-conditioning circulating water systems of textile mills with high concentration multiples, not only meets the needs of water treatment technology, but also is an economical and environment-friendly scale inhibitor.

Detailed ways

The present invention will be described in detail below in combination with specific embodiments.

The invention relates to a scale inhibitor for the air-conditioning circulating water system of a textile factory. The scale inhibitor is made of three monomers, itaconic acid, sodium allyl sulfonate and hydroxyethyl methacrylate, and undergoes free radical solution copolymerization reaction. A synthetic terpolymer scale inhibitor containing sulfonic acid groups, carboxylic acid groups, hydroxyl groups, and ester groups; the structural formula of the terpolymer scale inhibitors is:

Wherein, m, n, y represent respectively the molar mass of itaconic acid, sodium allyl sulfonate, hydroxyethyl methacrylate in the copolymer, m:n:y=(1.5～4.5):1:(0.4～ 1.0).

The present invention prepares a kind of method of antiscalant of air-conditioning circulating water system of textile factory, specifically implements according to the following steps:

Step 1, weigh the following components according to mass percentage: 2.91% to 5.11% of itaconic acid, 1.26% to 1.29% of sodium allyl sulfonate, 0.45% to 0.92% of hydroxyethyl methacrylate, and 0.44% of ammonium persulfate %~0.83%, tert-butanol 0.51%~0.68%, distilled water 91.69%~93.92%, the sum of the mass percentages of the above components is 100%;

Step 2, adding the itaconic acid, sodium allyl sulfonate, hydroxyethyl methacrylate, tert-butanol and distilled water weighed in step 1 into a three-necked flask, fixing the three-necked flask on a constant temperature heating magnetic stirrer, passing Stir with a magnetic stirrer until all the solids are dissolved and heat to 75°C to 90°C to obtain a mixture a;

Step 3, add the ammonium persulfate weighed in step 1 dropwise to the mixed solution a in step 2 with a constant pressure dropping funnel, keep it warm for 1.5 to 3 hours after the dropwise addition is completed, then cool to room temperature, and then use potassium hydroxide Adjust the pH value of the solution to only 5-7 to obtain a light yellow transparent liquid, namely the mixed solution b;

Step 4, add 95% absolute ethanol to the mixed solution b obtained in step 3 for precipitation, and filter the precipitate under reduced pressure and vacuum dry to obtain a scale inhibitor, wherein 95% absolute ethanol is added The amount is 2 to 3 times the total volume of the mixture b.

The reaction equation of antiscalant synthetic principle of the present invention is as follows:

The carboxyl group in the scale inhibitor of the air-conditioning circulating water system of the textile mill has a strong chelating ability to calcium ions, increases the solubility of inorganic salts, and inhibits the formation of calcium carbonate and calcium sulfate scale; the hydroxyl group causes distortion of the crystal structure , to reduce the crystal growth rate and keep it in a good uniform dispersion state; the sulfonic acid group has a strong hydrophilicity, which increases its tolerance to divalent cations; the ester group is to modify the unsaturated carboxylic acid copolymer properties, thereby improving the anti-scaling performance.

Example 1:

Step 1. Weigh respectively: itaconic acid (IA) 9.2929g, sodium allyl sulfonate (SAS) 4.12g, hydroxyethyl methacrylate (HEMA) 2.97463g, ammonium persulfate 1.4077g, tert-butanol 1.6385g g, distilled water 300g;

Step 2, the itaconic acid (IA) that is taken in step 1, sodium allyl sulfonate (SAS), hydroxyethyl methacrylate (HEMA), tert-butyl alcohol and distilled water are added in the three-necked flask, and the three-necked flask is fixed On a constant temperature heating magnetic stirrer, stir and heat to 90°C until all the solids are dissolved to obtain the mixed liquid a;

Step 3, add ammonium persulfate dropwise to the mixed solution a in step 2 through a constant pressure dropping funnel, keep warm for 1.5h after the dropwise addition is completed, then cool to room temperature, adjust the pH value to 5 with potassium hydroxide solution, and obtain light yellow Transparent liquid, i.e. mixed liquid b;

Step 4. Add 95% absolute ethanol whose volume is twice the volume of the mixed solution b to the mixed solution b obtained in step 3 for precipitation, filter the precipitate under reduced pressure and dry it in vacuum to obtain the purified product scale inhibitor agent.

Example 2:

Step 1. Weigh respectively: itaconic acid (IA) 13.01g, sodium allyl sulfonate (SAS) 4.12g, hydroxyethyl methacrylate (HEMA) 1.48731g, ammonium persulfate 1.7422g, tert-butanol 1.8614 g, distilled water 300g;

Step 2, the itaconic acid (IA) that is taken in step 1, sodium allyl sulfonate (SAS), hydroxyethyl methacrylate (HEMA), tert-butyl alcohol and distilled water are added in the three-necked flask, and the three-necked flask is fixed On a constant temperature heating magnetic stirrer, stir until all the solids are dissolved and heat to 85°C to obtain the mixed solution a;

Step 3, add ammonium persulfate dropwise to the mixed solution a in step 2 through a constant pressure dropping funnel, keep warm for 3 hours after the dropwise addition is completed, then cool to room temperature, adjust the pH value to 5 with potassium hydroxide solution, and obtain a light yellow transparent Liquid, i.e. mixed liquid b;

Step 4. Add 95% absolute ethanol whose volume is twice the volume of the mixed solution b to the mixed solution b obtained in step 3 for precipitation, filter the precipitate under reduced pressure and dry it in vacuum to obtain the purified product scale inhibitor agent.

Example 3:

Step 1. Weigh respectively: itaconic acid (IA) 13.01g, sodium allyl sulfonate (SAS) 4.12g, hydroxyethyl methacrylate (HEMA) 2.97463g, ammonium persulfate 2.7099g, tert-butanol 2.0102 g, distilled water 300g;

Step 2, the itaconic acid (IA) taken in step 1, sodium allyl sulfonate (SAS), hydroxyethyl methacrylate (HEMA), tert-butyl alcohol and distilled water are added in the three-necked flask, and the three-necked flask is fixed on Heating on a magnetic stirrer at a constant temperature, stirring until all the solids are dissolved and heating to 75°C to obtain a mixed liquid a;

Step 3, add ammonium persulfate dropwise to the mixed solution a in step 2 through a constant pressure dropping funnel, keep warm for 2 hours after the dropwise addition is completed, then cool to room temperature, adjust the pH value to 5 with potassium hydroxide solution, and obtain light yellow transparent Liquid, i.e. mixed liquid b;

Step 4. Add 95% absolute ethanol whose volume is twice the volume of the mixed solution b to the mixed solution b obtained in step 3 for precipitation, filter the precipitate under reduced pressure and dry it in vacuum to obtain the purified product scale inhibitor agent.

Example 4:

Step 1. Weigh respectively: itaconic acid (IA) 16.7271g, sodium allyl sulfonate (SAS) 4.12g, hydroxyethyl methacrylate (HEMA) 1.48731g, ammonium persulfate 2.6201g, tert-butanol 2.2332g g, distilled water 300g;

Step 2, the itaconic acid (IA) taken in step 1, sodium allyl sulfonate (SAS), hydroxyethyl methacrylate (HEMA), tert-butyl alcohol and distilled water are added in the three-necked flask, and the three-necked flask is fixed on Heating on a magnetic stirrer at a constant temperature, stirring until all the solids are dissolved and heating to 90°C to obtain a mixed liquid a;

Step 3, add ammonium persulfate dropwise to the mixed solution a in step 2 through a constant pressure dropping funnel, keep the temperature for 2 hours after the dropwise addition is completed, cool to room temperature after the reaction is completed, adjust the pH value to 5 with potassium hydroxide solution, and obtain the dilute Yellow transparent liquid, namely mixed liquid b;

Step 4. Add 95% absolute ethanol whose volume is twice the volume of the mixed solution b to the mixed solution b obtained in step 3 for precipitation, filter the precipitate under reduced pressure and dry it in vacuum to obtain the purified product scale inhibitor agent.

Example 5:

Step 1. Weigh respectively: itaconic acid (IA) 13.01g, sodium allyl sulfonate (SAS) 4.12g, hydroxyethyl methacrylate (HEMA) 2.97463g, ammonium persulfate 2.2112g, tert-butanol 2.0102 g, distilled water 300g;

Step 2, the itaconic acid (IA) taken in step 1, sodium allyl sulfonate (SAS), hydroxyethyl methacrylate (HEMA), tert-butyl alcohol and distilled water are added in the three-necked flask, and the three-necked flask is fixed on Heating on a magnetic stirrer at a constant temperature, stirring until all the solids are dissolved and heating to 90°C to obtain a mixed liquid a;

Step 3, add ammonium persulfate dropwise to the mixed solution a in step 2 through a constant pressure dropping funnel, keep the temperature for 2 hours after the dropwise addition is completed, cool to room temperature after the reaction is completed, adjust the pH value to 5 with potassium hydroxide solution, and obtain the dilute Yellow transparent liquid, namely mixed liquid b;

Step 4. Add 95% absolute ethanol whose volume is twice the volume of the mixed solution b to the mixed solution b obtained in step 3 for precipitation, filter the precipitate under reduced pressure and dry it in vacuum to obtain the purified product scale inhibitor agent.

The scale inhibitor synthesized in Examples 1-5 adopts the circulating water temperature system of the air-conditioning system of the textile mill in summer and winter, and tests its scale inhibition effect on calcium carbonate scale and calcium sulfate scale by the calcium carbonate deposition method. To compare the antiscaling effect of the agent polyaspartic acid under the same conditions:

Calcium carbonate scale scale inhibition effect test: calcium ion concentration 240mg/L, bicarbonate ion concentration 732mg/L, test temperature 25°C, 35°C;

Calcium sulfate scale inhibition effect test: calcium ion concentration 6000mg/L, sulfate ion concentration 7000mg/L, test temperature 25°C, 35°C;

The test results are shown in Table 1, and the dosage in the table is the dosage of the antiscalant prepared in different embodiments,

Table 1

As can be seen from Table 1, the scale inhibitor of the present invention is obviously better than ammonium polyaspartate to the scale inhibitor effect of calcium sulfate, and the scale inhibitor prepared in embodiment 4 and embodiment 5 is obvious to the scale inhibitor effect of calcium carbonate Better than polyaspartic acid, the scale inhibitor of the air-conditioning circulating water system of the textile mill overcomes the problems of low scale inhibition efficiency, complex preparation process and serious environmental pollution of the existing scale inhibitors. It effectively solves the fouling problem of spray air conditioning system and circulating water pipeline in textile mills, reduces pipeline resistance, prolongs the service life of equipment, improves system operation efficiency, and reduces the harm to the environment at the same time.

Claims (8)

1. a kind of air for air conditioning in textile factories circulation antisludging agent, it is characterised in that the antisludging agent is by itaconic acid, allyl sulphonic acid Three kinds of sodium, hydroxyethyl methacrylate monomers are raw material, contain sulfonic group, carboxylic by radical solution copolymerization reaction synthesis Acidic group, hydroxyl, the terpolymer antisludging agent of ester group.

2. a kind of air for air conditioning in textile factories circulation antisludging agent according to claim 1, it is characterised in that the ternary is total to Polymers antisludging agent structural formula is：

Wherein, m, n, y represent the molal weight of itaconic acid in copolymer, Sodium Allyl Sulfonate, hydroxyethyl methacrylate respectively, m：n：Y=(1.5~4.5):1:(0.4~1.0).

3. prepare a kind of method of air for air conditioning in textile factories circulation antisludging agent as claimed in claim 1, it is characterised in that tool Body is implemented according to following steps：

Step 1, following components is weighed respectively by mass percentage：Itaconic acid 2.91%~5.11%, Sodium Allyl Sulfonate 1.26%~1.29%, hydroxyethyl methacrylate 0.45%~0.92%, initiator 0.44%~0.83%, molecular regulation agent 0.51%~0.68%, distilled water 91.69%~93.92%, the sum of said components mass percent is 100%；

Step 2, by the itaconic acid weighed in step 1, Sodium Allyl Sulfonate, hydroxyethyl methacrylate, molecular regulation agent and steaming Distilled water mixes, and carries out magnetic agitation and is heated to certain temperature while solid all dissolvings, magnetic agitation, is mixed Liquid a；

Step 3, initiator step 1 weighed is added dropwise in the mixed liquor a in step 2, after being added dropwise keep the temperature 1.5~ 3h, is subsequently cooled to room temperature, then adjusts pH value 5~7 with potassium hydroxide solution, obtains light yellow transparent liquid, i.e. mixed liquor b；

Step 4, absolute ethyl alcohol is added into the mixed liquor b obtained by step 3 and carries out precipitating, and sediment is subjected to decompression and is filtered simultaneously Vacuum drying, obtains antisludging agent.

A kind of 4. preparation method of air for air conditioning in textile factories circulation antisludging agent according to claim 3, it is characterised in that The molecular regulation agent is the tert-butyl alcohol.

A kind of 5. preparation method of air for air conditioning in textile factories circulation antisludging agent according to claim 3, it is characterised in that The initiator is ammonium persulfate.

A kind of 6. preparation method of air for air conditioning in textile factories circulation antisludging agent according to claim 3, it is characterised in that The step 2 is itaconic acid, Sodium Allyl Sulfonate, hydroxyethyl methacrylate, molecular regulation agent and the distillation for weighing step 1 Water adds three-necked flask, and three-necked flask is fixed on constant-temperature heating magnetic stirring apparatus, is stirred simultaneously by magnetic stirring apparatus It is heated to 75 DEG C~90 DEG C.

A kind of 7. preparation method of air for air conditioning in textile factories circulation antisludging agent according to claim 3, it is characterised in that Initiator is added dropwise into mixed liquor a using constant pressure funnel in the step 3.

A kind of 8. preparation method of air for air conditioning in textile factories circulation antisludging agent according to claim 3, it is characterised in that The absolute ethyl alcohol that ethanol in the step 4 is 95%, its addition are 2~3 times of the mixed liquor b cumulative volumes.