CN115340163A - Paint mist coagulant and preparation method thereof - Google Patents

Abstract

The invention discloses a paint mist coagulant and a preparation method thereof, wherein the paint mist coagulant comprises an agent A and an agent B, and the agent A comprises the following components in percentage by mass: 3 to 8 percent of polyaluminum chloride, 0.2 to 1 percent of bentonite, 0.1 to 0.5 percent of methacryloyloxyethyl trimethyl ammonium chloride, 0.2 to 1 percent of mixed alkali and the balance of water; the component and mass ratio of the agent B are as follows: phytic acid 0.05-0.5%, alum 0.05-0.5%, starch 0.05-0.5%, cationic polyacrylamide 0.3-0.6%, oxidant 0.05-0.5%, and water in balance. The paint mist coagulant provided by the invention can treat various types of paint wastewater, and has deodorization and descaling functions, so that the treated water can be recycled for a long time, and meanwhile, the pipeline scaling can be prevented.

Description

Paint mist coagulant and preparation method thereof

Technical Field

The invention relates to the technical field of industrial wastewater treatment chemical agents, in particular to a paint mist coagulant and a preparation method thereof.

Background

The coating technology is a common means for changing the appearance and performance of products, the painting rate of the modern coating process is about 40-60%, namely about half of the paint is wasted because of the paint mist form diffusion. Wherein, most paint mist is generally absorbed by a spray room water curtain and a spray tower to form coating waste water. The COD of the coating waste water is very high, and is usually about 6000-10000 mg/L. The discharge of the part of waste water to a waste water treatment end requires a complicated process and high cost to treat the waste water to reach the standard. In addition, in order to ensure that the spray room water curtain runs normally, water is required to be changed continuously, and the amount of waste water generated by the water is large. And generate huge pressure for enterprises.

From the paint classification, paints used in daily life are classified into water-based paints and oil-based paints. At present, a plurality of medicaments for treating the 2 kinds of coating wastewater are available in the market. For example, CN112028200A discloses a paint mist coagulant suitable for water paint and a preparation method thereof, which is specially used for treating water paint waste water and has limited application range. In addition, the water treated by the paint mist coagulant can be recycled to a spray room water curtain and a spray tower, the recycling can last for several months, and the problems of water quality stink and water pipe scaling are easily caused, so that the paint mist coagulant also solves the problems that reuse water is stink and water pipe scaling is prevented in the process of treating waste water. Therefore, it is necessary to develop a versatile and multifunctional paint mist coagulant.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a paint mist coagulant which can treat water paint wastewater, oil paint wastewater and wastewater mixed with the water paint wastewater and the oil paint wastewater, prevent recycled water from smelling and avoid scaling of pipelines.

The invention also provides a method for preparing the paint mist coagulant.

A paint mist coagulant according to an embodiment of the first aspect of the invention comprises: the agent A comprises an agent A and an agent B, wherein the agent A comprises the following components in percentage by mass: 3 to 8 percent of polyaluminium chloride, 0.2 to 1 percent of bentonite, 0.1 to 0.5 percent of methacryloyloxyethyl trimethyl ammonium chloride, 0.2 to 1 percent of mixed alkali and the balance of water; the agent B comprises the following components in percentage by mass: phytic acid 0.05-0.5%, alum 0.05-0.5%, starch 0.05-0.5%, cationic polyacrylamide 0.3-0.6%, oxidant 0.05-0.5% and water in balance.

The paint mist coagulant provided by the embodiment of the invention has at least the following beneficial effects: the paint mist coagulant can treat water paint wastewater, oil paint wastewater and wastewater mixed with the water paint wastewater and the oil paint wastewater, improves the application range of the paint mist coagulant, and simultaneously adds two functional formulas of phytic acid and an oxidant into the agent B, so that the paint mist coagulant has the functions of deodorization and descaling, the treated water can be recycled for a long time, and the scaling of a pipeline can be prevented.

According to some embodiments of the invention, the mixed base is a mixture of any one or more of sodium hydroxide, triethanolamine, and potassium silicate.

According to some embodiments of the invention, the mixed base is a mixture of the sodium hydroxide, the triethanolamine and the potassium silicate, and the mixing ratio of the three is 1: (0.5-1): (0.5-1).

According to some embodiments of the invention, the oxidizing agent is one or a mixture of two of potassium persulfate and oxone.

According to some embodiments of the invention, the oxidizing agent is a mixture of potassium persulfate and oxone in a ratio of 1: (0.8-1.2).

According to a second aspect of the invention, the preparation method of the paint mist coagulant comprises the following steps:

preparation of the agent A:

adding the mixed alkali into water, and stirring at the rotating speed of 60-500 RPM until the mixed alkali is uniform;

adding methacryloyloxyethyl trimethyl ammonium chloride and stirring uniformly;

adding bentonite and stirring until the bentonite is fully swelled to obtain a solution I;

adding polyaluminum chloride into water, and stirring at the rotating speed of 60-500 RPM until the solution is uniform to obtain a second solution;

adding the first solution into the second solution, and uniformly stirring to obtain an agent A;

preparation of agent B:

adding phytic acid, alum, starch, an oxidant and cationic polyacrylamide into water in sequence, and stirring to dissolve completely to obtain a preparation B.

The preparation method of the paint mist coagulant provided by the embodiment of the invention has at least the following beneficial effects: the paint mist coagulant prepared by the method can treat water paint wastewater, oil paint wastewater and wastewater mixed with the water paint wastewater and the oil paint wastewater, the application range of the paint mist coagulant is improved, and meanwhile, two functional formulas of phytic acid and an oxidant are added into the agent B, so that the paint mist coagulant has the functions of deodorization and descaling, the treated water can be recycled for a long time, and the pipeline scaling can be prevented.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Detailed Description

The following examples of the present invention are described in detail for the purpose of illustration only and are not to be construed as limiting the invention. The equipment and reagents used in the present invention are, unless otherwise specified, conventional and commercially available products in the art.

In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

The embodiment of the first aspect of the invention provides a paint mist coagulant, which comprises an agent A and an agent B, wherein the agent A comprises the following components in percentage by mass: 3 to 8 percent of polyaluminium chloride, 0.2 to 1 percent of bentonite, 0.1 to 0.5 percent of methacryloyloxyethyl trimethyl ammonium chloride, 0.2 to 1 percent of mixed alkali and the balance of water; the component and mass ratio of the agent B are as follows: phytic acid 0.05-0.5%, alum 0.05-0.5%, starch 0.05-0.5%, cationic polyacrylamide 0.3-0.6%, oxidant 0.05-0.5%, and water in balance.

The paint mist coagulant provided by the application can treat water-based paint wastewater, oil-based paint wastewater and wastewater mixed by the water-based paint wastewater and the oil-based paint wastewater, improves the application range of the paint mist coagulant, and simultaneously adds two functional formulas of phytic acid and an oxidant into the agent B, so that the paint mist coagulant has the functions of deodorization and descaling, so that the treated water can be recycled for a long time, and the pipeline scaling can be prevented.

The A agent adopts bentonite and polyaluminium chloride to act as a flocculating agent, so that paint mist particles in the wastewater can be gathered and enlarged to gradually form flocs and be separated from water, and the wastewater purification effect is realized. And the polyaluminium chloride and the bentonite are general flocculants and can simultaneously purify water-based or oily paint wastewater. The methacryloyloxyethyl trimethyl ammonium chloride plays a role in dispersing in the agent A, and can fully disperse the bentonite which is easy to settle in water.

When the paint mist coagulant is used for treating wastewater, the proportion value of the agent A to the wastewater is 0.2%, the proportion value of the agent B to the wastewater is 0.3%, and the dosage of the agent accounts for 0.5% of the total wastewater.

In some embodiments of the present invention, the mixed base in the agent a is a mixture of one or more of sodium hydroxide, triethanolamine and potassium silicate, and may be a mixture of any two or a mixture of three.

When the mixed alkali is a mixture of three types of sodium hydroxide, triethanolamine, and potassium silicate, the mixing ratio may be, for example, 1: (0.5-1): (0.5 to 1), and the mixing ratio can be 1.

The agent A uses sodium hydroxide, triethanolamine and potassium silicate as mixed alkali, and the mixed alkali can adjust the pH value (hydrogen ion concentration index) of the agent A, so that the agent A can reach the pH value triggering flocculation reaction when being added into water, and the flocculation reaction can be rapidly carried out. The sodium hydroxide, triethanolamine, and potassium silicate may be mixed in other mixing ratios, which may be determined according to actual conditions, and are not particularly limited herein.

In some embodiments of the present invention, the oxidizing agent in agent B is one of potassium persulfate and potassium hydrogen persulfate, or a mixture of the two. It should be noted that the oxidizing agent may be a mixture of potassium persulfate and oxone, and the mixing ratio is 1: (0.8-1.2), such as 1.

It should be noted that potassium persulfate and oxone are activated by the influence of trace metal ions in water, and thus have an oxidizing effect, and can degrade organic pollutants dissolved in wastewater, and after the organic pollutants in wastewater are degraded, the treated wastewater can be continuously used without smelling. It should be noted that the process of wastewater purification and reuse generally lasts for more than three months, and the addition of the oxidizing agent to the agent B can ensure that the purified water does not smell during the reuse process.

The phytic acid in the component of the agent B is an efficient scale remover, and can dissolve scales in a recycled water conveying pipeline, so that the pipeline can be ensured to be neat and smooth.

It should be noted that the starch, alum and cationic polyacrylamide added in the agent B can further agglomerate the flocs generated after the agent A is added to form larger flocs, and the excellent floating performance can be obtained after the gas is wrapped by the larger flocs.

The preparation method of the paint mist coagulant provided by the embodiment of the second aspect of the invention comprises the preparation of the agent A and the preparation of the agent B.

The preparation method of the agent A comprises the following steps: firstly, adding mixed alkali into water and uniformly stirring, then adding methacryloyloxyethyl trimethyl ammonium chloride and uniformly stirring, adding bentonite and stirring until the bentonite is fully swelled to obtain a solution I. It should be noted that, after the bentonite is added, the stirring can be continued for 2 to 3 hours to fully swell the bentonite, for example, the stirring can be carried out for 2 hours or 3 hours, and only the bentonite needs to be fully swelled, which can be determined according to actual situations.

And adding the polyaluminum chloride into the water and uniformly stirring to obtain a solution II.

And slowly adding the solution I into the solution II, and uniformly stirring to obtain the agent A.

It should be noted that, the solution one is slowly added into the solution two, which can ensure that the pH value of the agent A is slowly increased and stabilized at a proper value, so that the agent A is not easy to solidify.

It should be noted that, in the preparation process of the agent a, the mixed alkali is added into water and stirred at a rotation speed of 60RPM to 500RPM, for example, 60RPM, 100RPM, 200RPM or 500RPM may be used, which is not limited herein.

It should be noted that, during the preparation of the agent A, the polyaluminum chloride is added into the water and stirred at a speed of 60RPM to 500RPM, for example, 60RPM, 100RPM or 500RPM, which is determined by the actual situation and is not limited herein.

The preparation method of the agent B comprises the following steps: phytic acid, alum, starch, an oxidizing agent, and cationic polyacrylamide were sequentially added to water, and the materials were completely dissolved with stirring, thereby obtaining an agent B.

The paint mist coagulant prepared by the method can treat water paint wastewater, oil paint wastewater and wastewater mixed with the water paint wastewater and the oil paint wastewater, the application range of the paint mist coagulant is improved, and meanwhile, two functional formulas of phytic acid and an oxidant are added into the agent B, so that the paint mist coagulant has the functions of deodorization and descaling, the treated water can be recycled for a long time, and the pipeline scaling can be prevented.

In some embodiments of the invention, the agent A and the agent B are respectively added into water paint wastewater, oil paint wastewater and mixed wastewater of the water paint wastewater, the oil paint wastewater and the mixed wastewater which have the same turbidity, the adding amount of the paint mist coagulant is 5 per mill of the wastewater, the mixture is uniformly stirred and kept stand, after surface scum is removed, a water sample 5cm below the water surface is taken, and the turbidity of the water sample is tested by a turbidity testing method according to HJ 1075-2019 turbidity determination method for water quality.

The first embodiment is as follows:

the paint mist coagulant comprises an agent A and an agent B.

The agent A comprises the following components in percentage by mass: 6% of polyaluminium chloride, 0.3% of bentonite, 0.3% of methacryloyloxyethyl trimethyl ammonium chloride, 0.5% of mixed alkali and the balance of water. Wherein the mixed alkali is a mixture of sodium hydroxide, triethanolamine and potassium silicate according to the weight ratio of 1.

The component and mass ratio of the agent B are as follows: phytic acid 0.05%, alum 0.2%, starch 0.2%, cationic polyacrylamide 0.4%, oxidant 0.5%, and water in balance.

The preparation method of the paint mist coagulant comprises the following steps:

preparation of the agent A: step 1: adding mixed alkali into water, stirring at the rotating speed of 60-500 rpm, then sequentially adding methacryloyloxyethyl trimethyl ammonium chloride and bentonite under stirring, continuing stirring for 2 hours, and marking the solution as solution one after the bentonite is fully swelled;

step 2: adding polyaluminum chloride into water, stirring at the rotating speed of 60-500 rpm, and marking the solution as a second solution;

and 3, step 3: and slowly adding the solution I into the solution II, and continuously stirring uniformly at the rotating speed of 60-500 rpm to obtain the agent A.

Preparation of agent B: adding phytic acid, alum, starch, an oxidant and cationic polyacrylamide into water in sequence while stirring, and stirring to completely dissolve the phytic acid, the alum, the starch, the oxidant and the cationic polyacrylamide to obtain a preparation B.

Example two:

the only difference from example 1 is that in this example, no polyaluminium chloride was added to agent A.

Example three:

the only difference from example 1 is that in this example, no bentonite was added to the agent a.

Example four:

the only difference from example 1 is that in this example, no methacryloyloxyethyl trimethyl ammonium chloride was added to agent A.

Example five:

the only difference from example 1 is that in this example, no mixed base was added to the agent a.

The paint mist coagulant prepared in the above examples one to five was added to 3 kinds of waste water of aqueous paint waste water, oily paint waste water and mixed waste water of both, respectively, and turbidity was measured. The turbidity removal rates are shown in table 1:

TABLE 1 turbidity removal rates obtained in the respective embodiments

As can be seen from the table above, the water sample treated by the formula of the embodiment can obtain high turbidity removal rate, and the purification effects of the water paint wastewater, the paint wastewater and the mixed wastewater are good, so that the purification requirements are met.

Example two lacked polyaluminium chloride compared with example one, the turbidity removal rate of the treated waste water was much lower, the waste water was very turbid, which shows that the polyaluminium chloride plays a main flocculation role in the formula of the agent A.

In example three, the lack of bentonite compared with example one, the turbidity removal rate of the treated wastewater is reduced, which indicates that the bentonite plays a role in assisting flocculation in the formula of the agent A.

Example four compared with example one, the lack of methacryloxyethyltrimethyl ammonium chloride, the turbidity removal rate of the treated wastewater is reduced, which shows that the methacryloxyethyltrimethyl ammonium chloride as a surfactant in the formula of the agent A has a promoting effect on wastewater purification.

In the fifth embodiment, compared with the first embodiment, the mixed alkali is absent, the turbidity removal rate of the treated wastewater is low, and the wastewater is turbid, because the mixed alkali can adjust the pH value of the wastewater to be in the reaction range of the flocculant, thereby realizing the high-efficiency purification effect.

Example six:

the only difference from example one is that in this example, the mixed base is a mixture of triethanolamine and potassium silicate according to 1.

Example seven:

the only difference from example one is that in this example, the mixed base is a mixture of sodium hydroxide and potassium silicate according to 1.

Example eight:

the only difference from example one is that in this example, the mixed base is a mixture of sodium hydroxide and triethanolamine according to 1.

Example nine:

the only difference from example one is that in this example, the mixed base is replaced by a single sodium hydroxide.

Example ten:

the only difference from example one is that in this example, the mixed base is replaced by a single triethanolamine.

Example eleven:

the only difference from example one is that in this example, the mixed base is replaced by a single potassium silicate.

The paint mist coagulant prepared in the above example one and examples six to eleven was added to 3 kinds of waste water of aqueous paint waste water, oily paint waste water and both mixed waste water, respectively, and tested for turbidity. The turbidity removal rates are shown in table 2:

TABLE 2 turbidity removal rates obtained in the respective embodiments

As can be seen from Table 2, in examples six to eleven, the three mixed bases of example one were replaced with two or one, and as can be seen from the turbidity removal rate, the water sample was cleaner using a mixture of three bases of sodium hydroxide, triethanolamine and potassium silicate as a pH adjusting agent.

It should be noted that, when the mixed alkali is one of three alkali of sodium hydroxide, triethanolamine and potassium silicate, or a mixture of any two of them, the turbidity removal rate of the wastewater can be at a higher level.

Example twelve:

the difference from the first embodiment is that in the first embodiment, no phytic acid is added into the agent B.

Example thirteen:

the only difference from example one is that in this example, no alum was added to the agent B.

Example fourteen:

the only difference from example one is that in this example, no starch is added to agent B.

Example fifteen:

the difference from the first example is that in this example, no cationic polyacrylamide is added to the agent B.

Example sixteen:

the only difference from the first example is that in this example, no oxidizing agent was added to the agent B.

The paint mist coagulant prepared in the above example one and the paint mist coagulant prepared in example twelve to example sixteen were added to 3 kinds of wastewater, i.e., aqueous paint wastewater, oil paint wastewater and both mixed wastewater, respectively, and tested for turbidity. The turbidity removal rates are shown in table 3:

TABLE 3 turbidity removal rates obtained in the respective embodiments

As can be seen from table 3, the two examples twelve and the sixteen comparative examples lack the detergent phytic acid and the oxidant, respectively, and the turbidity removal rates are approximately similar, indicating that the phytic acid and the oxidant are functional in the formulation, i.e., provide both the detergent and the oxidative deodorization.

The thirteen examples and the fourteen comparative examples, which lack alum and starch respectively, had a significant reduction in turbidity removal, indicating that alum and starch act as a coagulum aid in the formulation.

Fifteen examples had a greatly reduced turbidity removal rate in the absence of cationic polyacrylamide compared to one example, indicating that cationic polyacrylamide plays a major role in the formulation.

Although the embodiments of the present invention have been described in detail with reference to the table data, the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (6)

1. A paint mist coagulant, comprising:

the agent A and the agent B are mixed,

the agent A comprises the following components in percentage by mass: 3 to 8 percent of polyaluminum chloride, 0.2 to 1 percent of bentonite, 0.1 to 0.5 percent of methacryloyloxyethyl trimethyl ammonium chloride, 0.2 to 1 percent of mixed alkali and the balance of water;

the agent B comprises the following components in percentage by mass: phytic acid 0.05-0.5%, alum 0.05-0.5%, starch 0.05-0.5%, cationic polyacrylamide 0.3-0.6%, oxidant 0.05-0.5%, and water in balance.

2. The paint mist coagulant according to claim 1, wherein the mixed base is a mixture of any one or more of sodium hydroxide, triethanolamine and potassium silicate.

3. The paint mist coagulant according to claim 2, wherein the mixed alkali is a mixture of the sodium hydroxide, the triethanolamine and the potassium silicate, and the mixing ratio of the sodium hydroxide, the triethanolamine and the potassium silicate is 1: (0.5-1): (0.5-1).

4. The paint mist coagulant of claim 1 wherein the oxidant is one or a mixture of two of potassium persulfate and oxone.

5. The paint mist coagulant according to claim 1, wherein the oxidizing agent is a mixture of potassium persulfate and oxone in a ratio of 1: (0.8-1.2).

6. The preparation method of the paint mist coagulant is characterized by comprising the following steps:

preparation of agent A:

adding the mixed alkali into water, and stirring at the rotating speed of 60-500 RPM until the mixed alkali is uniform;

adding methacryloyloxyethyl trimethyl ammonium chloride and stirring uniformly;

adding bentonite and stirring until the bentonite is fully swelled to obtain a solution I;

adding polyaluminum chloride into water, and stirring at the rotating speed of 60-500 RPM until the solution is uniform to obtain a second solution;

adding the first solution into the second solution, and uniformly stirring to obtain an agent A;

preparation of agent B:

adding phytic acid, alum, starch, an oxidant and cationic polyacrylamide into water in sequence, and stirring until the phytic acid, the alum, the starch, the oxidant and the cationic polyacrylamide are completely dissolved to obtain a preparation B.