Terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning and its preparation method

Abstract

A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, containing tourmaline, polyaspartic acid, polyepoxysuccinic acid, polymaleic acid, etidronic acid, zinc salt, and the like, wherein the content of the tourmaline is 5-500 g/t (calculated based on solid form); the content of polyaspartic acid, polyepoxysuccinic acid, polymaleic acid and etidronic acid is 2-60 g/t (calculated based on liquid form); and the content of the zinc salt is 0.2-0.8 g/t (calculated based on solid form), is provided. Also disclosed is a method of preparing the terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning.

Claims

1. A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, comprising: tourmaline, a copolymer and zinc salt, wherein the tourmaline may be dravite, schorlite, elbaite, manganese tourmaline, or uvite, the zinc salt is any one or a mixture of zinc sulfate and zinc chloride, wherein the copolymer is a polymer of any three or four of polyaspartic acid, polyepoxysuccinic acid, polymaleic acid and etidronic acid; wherein a content of tourmaline is 5-500 grams per metric ton (g/t) calculated based on solid form; a content of the copolymer is 2-60 grams per metric ton (g/t) calculated based on liquid form; and a content of the zinc salt is 0.2-0.8 grams per metric ton (g/t) calculated based on solid form.

2. The terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning according to claim 1, wherein the content of the copolymer is 6-16 g/t calculated based on liquid form.

3. The terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning according to claim 1, wherein a concentration rate of the circulating cooling water of central air conditioning is 3-12.

4. A preparation method of the terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning according to the claim 1, wherein the preparation method comprises the following steps: 1) dissolving 2-60 g of the polymer of any three or four of polyaspartic acid, polyepoxysuccinic acid, polymaleic acid and etidronic acid into 1000 ml of deionized water, and adding 0.2-0.8 g of the zinc salt; 2) heating to 55-75 C., and performing a heat preservation reaction on the polymer solution for 4-6 hours under the condition of stirring, and then cooling, thereby obtaining a terpolymerized mother liquor; and 3) in 1 L of the circulating cooling water of central air conditioning, firstly feeding 6-600 mg of the tourmaline directly or through a recyclable tourmaline dosing device, and subsequently adding 1 g of the terpolymerized mother liquor directly.

5. The preparation method of the terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning according to claim 4, wherein in step 1), 0.2-2 g of benzotriazole is added into the corrosion and scale inhibitor for copper-containing devices.

6. The preparation method of the terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning according to claim 4, wherein in step 2), the optimal temperature is 65 C., and the optimal reaction time is 5 hours.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) A terpolymerized corrosion and scale inhibitor for used in circulating cooling water of central air conditioning, which consists of tourmaline, polyaspartic acid, polyepoxysuccinic acid, polymaleic acid or etidronic acid, zinc salt and the like, wherein any three or four of polyaspartic acid, polyepoxysuccinic acid, polymaleic acid and etidronic acid are polymerized; the tourmaline may be dravite, schorlite, elbaite, manganese tourmaline, uvite or the like. The content of the tourmaline is 5-500 g/t (calculated based on solid form, i.e. the solid addition amount in each ton of water); the content of polyaspartic acid, polyepoxysuccinic acid, polymaleic acid or etidronic acid is 2-60 g/t (calculated based on liquid form, i.e. the liquid addition amount in each ton of water); the content of the zinc salt is 0.2-0.8 g/t (calculated based on solid form zinc salt, i.e. the solid zinc salt addition amount in each ton of water). The zinc salt is selected from any one or two of zinc sulfate and zinc chloride. Copper corrosion can be effectively inhibited by adding 0.2-2 g/t (calculated based on solid form, i.e. the benzotriazole addition amount in each ton of water) of benzotriazole into the copper-containing devices.

Embodiment 1

(2) A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, 20 g of polyaspartic acid, 15 g of polyepoxysuccinic acid, 12 g of etidronic acid and 0.6 g of ZnSO.sub.4 solid are sequentially dissolved into 1000 ml of deionized water that define a polymer solution, which is heated to 65 C., performed a heat preservation reaction for 5 hours under the condition of stirring, and then cooled, thereby the terpolymerized mother liquor is obtained.

(3) In 1 L of the circulating cooling water of central air conditioning, firstly 100 mg of the tourmaline is feeded directly or through a recyclable tourmaline dosing device, and secondly 1 g of the terpolymerized mother liquor is added directly. The tourmaline can be recycled.

Embodiment 2

(4) A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, 20 g of polyaspartic acid, 18 g of polyepoxysuccinic acid, 12 g of etidronic acid, 15 g of polymaleic acid and 0.6 g of ZnSO.sub.4 solid are sequentially dissolved into 1000 ml of deionized water that define a polymer solution, which is heated to 65 C., performed a heat preservation reaction for 5 hours under the condition of stirring, and then cooled, thereby the terpolymerized mother liquor is obtained.

(5) In 1 L of the circulating cooling water of central air conditioning, firstly 100 mg of the tourmaline is feeded directly or through the recyclable tourmaline dosing device, and secondly 1 g of the terpolymerized mother liquor is added directly. The tourmaline can be recycled.

Embodiment 3

(6) A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, 15 g of polyaspartic acid, 10 g of polyepoxysuccinic acid, 10 g of polymaleic acid and 0.6 g of ZnSO.sub.4 solid are sequentially dissolved into 1000 ml of deionized water that define a polymer solution, which is heated to 55 C., performed a heat preservation reaction for 4 hours under the condition of stirring, and then cooled, thereby the terpolymerized mother liquor is obtained.

(7) In 1 L of the circulating cooling water of central air conditioning, firstly 120 mg of the tourmaline is feeded directly or through the recyclable tourmaline dosing device, and secondly 1 g of the terpolymerized mother liquor is added directly. The tourmaline can be recycled.

Embodiment 4

(8) A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, 15 g of polyaspartic acid, 12 g of etidronic acid, 10 g of polymaleic acid, 0.6 g of ZnSO.sub.4 solid and 1.8 g of benzotriazole are sequentially dissolved into 1000 ml of deionized water that define a polymer solution, which is heated to 65 C., performed a heat preservation reaction for 5 hours under the condition of stirring, and then cooled, thereby the terpolymerized mother liquor is obtained.

(9) In 1 L of the circulating cooling water of central air conditioning, firstly 120 mg of the tourmaline is feeded directly or through the recyclable tourmaline dosing device, and secondly 1 g of the terpolymerized mother liquor is added directly. The tourmaline can be recycled.

Embodiment 5

(10) A terpolymerized corrosion and scale inhibitor used in circulating cooling water of central air conditioning, 15 g of polyaspartic acid, 10 g of polyepoxysuccinic acid, 12 g of etidronic acid, 10 g of polymaleic acid and 0.6 g of ZnSO.sub.4 solid are sequentially dissolved into 1000 ml of deionized water that define a polymer solution, which is heated to 75 C., performed a heat preservation reaction for 6 hours under the condition of stirring, and then cooled, thereby the terpolymerized mother liquor is obtained.

(11) In 1 L of the circulating cooling water of central air conditioning, firstly 120 mg of the tourmaline is feeded directly or through the recyclable tourmaline dosing device, and secondly 1 g of the terpolymerized mother liquor is added directly. The tourmaline can be recycled.

(12) In the embodiments of the invention, a carbon steel test piece is made of #20 steel, and the specification is 500 mm*25 mm*2 mm. The corrosion inhibition performance is tested according to the National Standards of the People's Republic of China GB/T18175-2000, Determination of Corrosion Inhibition Performance of Water Treatment AgentsRotation Specimen Method, a rotating hanging sample corrosion analyzer is adopted for corrosion inhibition test, the temperature is 45 C., and the rotation speed is 75 r/min. The scale inhibition performance is tested according to the National Standards of the People's Republic of China GB/T16632-2008, Determination of Scale Inhibition Performance of Water Treatment AgentsCalcium Carbonate Precipitation Method.

(13) Water with pH of 6.8, the electric conductivity of 134 s/L, the total hardness (in CaCO.sub.3) of 48 mg/L, the total alkalinity (in CaCO.sub.3) of 22 mg/L and 16 mg/L of chloridion (Ci) is taken from a municipal water supply station in Guangzhou to prepare test water with the concentration rate of 5 (the concentration rate of the circulating cooling water is 3-12), pH is 7.6, the total hardness (in CaCO.sub.3) is 242 mg/L, and the total alkalinity (in CaCO.sub.3) is 108 mg/L.

(14) TABLE-US-00001 TABLE 1 List of corrosion and scale inhibition performance of embodiments 1-5 Polyepoxysuccinic etidronic Polymaleic Corrosion Tourmaline Polyaspartic acid acid acid Zinc Benzotriazole rate Scale inhibition Embodiment (mg/L) acid (mg/L) (mg/L) (mg/L) (mg/L) salt (mg/L) (mg/L) mm/a rate % 1 100 20 15 12 0 0.6 0 0.042 94 2 100 0 18 12 15 0.6 0 0.036 96 3 120 15 10 0 10 0.6 0 0.032 98 4 120 15 0 12 10 0.6 1.8 0.003 96 5 120 15 10 12 10 0.6 0 0.003 98

(15) In the embodiments 1-5 in the table 1, the tourmaline, the polyaspartic acid, the polyepoxysuccinic acid, the etidronic acid, the polymaleic acid, the zinc sulfate and the like are mixed in different ratios, and thus multi-component composite formulae with synergistic effect can be obtained.

(16) Corrosion rates obtained from hanging sample corrosion tests (carbon steel corrosion tests in embodiments 1-3, copper alloy corrosion tests in embodiment 4 and stainless steel corrosion tests in embodiment 5) show that:

(17) Under the working condition of simulated circulating cooling water, the composite formulae all have good corrosion inhibition performance, the corrosion rates are all less than 0.075 mm/a, and the corrosion is less than the corrosion rate upper limit 0.075 mm/a (the corrosion rate upper limit 0.005 mm/a of copper alloy and stainless steel) of the carbon steel devices according to GB 50050-2007 Code for Design of Industrial Recirculating Cooling Water Treatment, and the scale inhibition performance can also meet provisions of the national standard. The corrosion and scale inhibitor provided by embodiments of the invention has the advantages of excellent performance, simple preparation method, convenience in use, low dosing concentration and the like, and has wide application prospects and high economic values.

(18) The following provides a simple formula and a simple operation method which not only can meet the requirements of the circulating cooling water system on corrosion and scale inhibition, but also are small in dosage, low in cost and good in effect, and remarkable economic benefits and wide social benefits can be made.

(19) The content above is only relatively optimal embodiments of the invention and does not limit embodiments of the invention in any mode, and content within the technical scheme of embodiments of the invention, any simple modification and equivalent variation and embellishment to the embodiments according to the technical essence of embodiments of the invention all belong to the technical scheme of embodiments of the invention.