Production method of anionic garbage capturing agent

Abstract

The invention relates to the technical field of papermaking production, in particular to a production method of an anionic garbage capturing agent, when a high-positive-charge low-molecular-weight polymer is prepared, high-density positive charges of the anionic garbage capturing agent can effectively adsorb anionic garbage, fine fibers and fine components in a system; the consumption of aluminum sulfate can be effectively reduced, after the consumption of the aluminum sulfate is reduced, the concentration of sulfuric acid anions is reduced by about 30%, and interference on a wastewater treatment system can be reduced; in the using process, PCD control over white water is stable, the turbidity of the white water has a decreasing trend, it is indicated that colloid retention of the system becomes good, the system is cleaner, and therefore certain benefits can be brought to improvement of the operation performance of a paper machine; as an organic anion garbage trapping agent which is low in molecular weight, high in charge density and free of sulfate radicals, the anion garbage trapping agent is small in adding amount, cannot be accumulated in a system, can be taken away along with a paper web in the papermaking process, and cannot cause any influence on a water system.

Description

Technical Field

[0001] The invention relates to the technical field of paper production, in particular to a method for producing an anionic garbage capture agent. Background Art

[0002] With the transformation of wet-end chemistry to a medium-alkaline papermaking system, the large-scale recycling of secondary fibers and the improvement of the degree of white water closure, the problem of anionic garbage has become increasingly prominent. Anionic garbage refers to the general term for all soluble ionic oligomers or polymers and non-ionic hydrolyzed colloid substances present in the wet end of the paper machine. Anionic garbage can consume a large amount of cationic polymers, and even partially or completely ineffective cationic additives, and may cause a series of paper machine operation problems and paper sheet quality problems. To prevent these problems from occurring, anionic garbage capture agents are added in the early stage of wet-end pulp preparation of paper machines to pre-neutralize anionic impurities. Anionic garbage capture agents added in appropriate amounts can form a one-to-one compact and small-volume counterpart with anionic impurities. This counterpart can be deposited and retained in the fibers, thereby being removed from the system.

[0003] The prior art is to add a relatively large amount of aluminum sulfate as an anionic garbage capture agent in the mixed pulp pool of a paper machine. Aluminum sulfate, an anionic garbage capture agent with good effect in acidic papermaking, gradually loses its positive charge or even disappears after the wet environment tends to be neutral. In the actual production process, if aluminum sulfate is used excessively, the charge shielding effect caused by the high charge density of aluminum ions will reduce the electrostatic attraction between the cationic additive and the fiber, thereby affecting the effect of the additive. In addition, excessive aluminum sulfate dosage will lead to a decrease in the pH value of the system and corrosion of the equipment. In wastewater treatment, the biological reducibility of sulfate increases the toxicity of sulfur, and excessive sulfate ion concentration will also inhibit the methanogenesis process. Therefore, excessive sulfate ion concentration has a certain negative impact on the treatment of terminal wastewater. Therefore, in view of the above problems, a method for producing an anionic garbage capture agent is proposed. Summary of the invention

[0004] The object of the present invention is to provide a method for producing an anionic garbage capture agent to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] As an optional scheme of the method for producing an anionic garbage capture agent of the present invention, a method for producing an anionic garbage capture agent comprises the following steps:

[0007] Step 1: Material preparation: First, prepare the materials, which include organic polymer, inorganic polymer, cross-linking agent, cationic monomer, electrolyte and water;

[0008] Step 2: polymer preparation: put the organic polymer and the inorganic polymer into a mixer and mix them. During the mixing process, gradually add the cross-linking agent. The stirring time is 30-60 minutes. The stirring temperature is between 50℃ and 905℃. The speed is 1500r / min. After stirring for half an hour, keep the temperature for 0.5h, take out the material and place it at room temperature.

[0009] Step 3: Liquid preparation: Mix the electrolyte and water and put them into a blender. The blending time is 10-15 minutes, the blending temperature is between 15℃ and 45℃, and the blender speed is 55r / min. After 10 minutes of blending, take it out and place it in a bucket for later use.

[0010] Step 4: The content of the organic polymer and the inorganic polymer mixture is 20-40 parts, the electrolyte and water mixture is 60-80 parts, the cationic monomer is 4-50 parts, and the crosslinking agent is 5-45 parts;

[0011] Step 5: The mixture of organic polymer and inorganic polymer is introduced into the reactor again, and during the mixing process, a mixture of electrolyte and water is gradually added. The mixing temperature is 20°C-40°C. The mixture of electrolyte and water is added once every 5 minutes, and the addition is completed in three times. After all the materials are added, continue mixing for 5-10 minutes to obtain a high cationic charge low molecular weight polymer.

[0012] As an optional scheme of the method for producing anionic garbage capture agent described in the present invention, the electrolyte and water are stirred and mixed in a ratio of 1:9.2.

[0013] As an optional scheme of the method for producing anionic garbage capture agent described in the present invention, the organic polymer and the inorganic polymer are stirred and mixed in a ratio of 0.9:1.1.

[0014] As an optional scheme of the method for producing anionic garbage capture agent described in the present invention, the reactor is a reactor with a cooling device and a temperature control system.

[0015] As an optional scheme for the production method of anionic garbage capture agent described in the present invention, the cationic monomer is one of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxypropyl trimethyl ammonium chloride and allyl trimethyl ammonium chloride, or a mixture of two of them.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The high-density positive charge of the anionic garbage capture agent in the present invention can effectively adsorb anionic garbage, fine fibers and fine components in the system; the dosage of aluminum sulfate can be effectively reduced. After the dosage of aluminum sulfate is reduced, the concentration of sulfate anions is reduced by about 30% compared with before, which can reduce the interference with the wastewater treatment system; the PCD control of white water during use is relatively stable, and the turbidity of white water has a downward trend, indicating that the colloid retention of the system is improved and the system is cleaner, which will also bring certain benefits to the improvement of the operating performance of the paper machine; as an organic low molecular weight, high charge density, sulfate-free anionic garbage capture agent, the addition amount is small and will not accumulate in the system, but will be taken away with the paper web during the papermaking process, and will not cause any impact on the water system. DETAILED DESCRIPTION

[0018] Embodiment 1: The present invention provides a technical solution:

[0019] A method for producing an anionic garbage capture agent comprises the following steps:

[0020] Step 1: Material preparation: First, prepare the materials, which include organic polymer, inorganic polymer, cross-linking agent, cationic monomer, electrolyte and water;

[0021] Step 2: polymer preparation: put the organic polymer and the inorganic polymer into a mixer and mix them. During the mixing process, gradually add the cross-linking agent. The stirring time is 30-60 minutes. The stirring temperature is between 50℃ and 905℃. The speed is 1500r / min. After stirring for half an hour, keep the temperature for 0.5h, take out the material and place it at room temperature.

[0022] Step 3: Liquid preparation: Mix the electrolyte and water and put them into a blender. The blending time is 10-15 minutes, the blending temperature is between 15℃ and 45℃, and the blender speed is 55r / min. After 10 minutes of blending, take it out and place it in a bucket for later use.

[0023] Step 4: The content of the organic polymer and the inorganic polymer mixture is 20-40 parts, the electrolyte and water mixture is 60-80 parts, the cationic monomer is 4-50 parts, and the crosslinking agent is 5-45 parts;

[0024] Step 5: The mixture of organic polymer and inorganic polymer is introduced into the reactor again, and during the mixing process, a mixture of electrolyte and water is gradually added. The mixing temperature is 20°C-40°C. The mixture of electrolyte and water is added once every 5 minutes, and the addition is completed in three times. After all the materials are added, continue mixing for 5-10 minutes to obtain a high cationic charge low molecular weight polymer.

[0025] The electrolyte and water are stirred and mixed in a ratio of 1:9.2.

[0026] The organic polymer and the inorganic polymer are stirred and mixed in a ratio of 0.9:1.1.

[0027] The reactor is a reactor with a cooling device and a temperature control system.

[0028] The cationic monomer is one of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxypropyl trimethyl ammonium chloride and allyl trimethyl ammonium chloride, or a mixture of two of them.

[0029] Workflow: After the product is made, it is a colorless to light yellow transparent viscous liquid with a weak pungent odor, pH value <6.5, relative density 1020-1320kg / m3, boiling point >100℃, freezing point -10℃, completely soluble in water, insoluble in oil, stable performance, no toxic substances produced. When the temperature exceeds 100℃, the viscosity will increase after the water evaporates. When the temperature is below 5℃, the operation is more difficult. It is generally added to the pulp preparation tank and paper machine pulp tank, or directly added to the white water under the screen;

[0030] The basic mechanism of action of cationic polymers in the wet end is mainly charge neutralization and flocculation of "fragments". The charge neutralizer should fix the anionic garbage particles on the fiber, and it is difficult to peel them off by shear force. At the same time, due to the diversity of anionic garbage in secondary fibers, the broad spectrum of anionic garbage capture agents needs to be considered. In addition to the functions of charge neutralization and resin fixation, anionic garbage capture agents can also play an auxiliary role in retention and filtration.

[0031] The high-density positive charge of the anionic garbage capture agent in the present invention can effectively adsorb anionic garbage, fine fibers and fine components in the system; the dosage of aluminum sulfate can be effectively reduced. After the dosage of aluminum sulfate is reduced, the concentration of sulfate anions is reduced by about 30% compared with before, which can reduce the interference with the wastewater treatment system; the PCD control of white water during use is relatively stable, and the turbidity of white water has a downward trend, indicating that the colloid retention of the system is improved and the system is cleaner, which will also bring certain benefits to the improvement of the operating performance of the paper machine; as an organic low molecular weight, high charge density, sulfate-free anionic garbage capture agent, the addition amount is small and will not accumulate in the system, but will be taken away with the paper web during the papermaking process, and will not cause any impact on the water system.

[0032] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A method for producing an anionic garbage capture agent, characterized in that: The following steps are involved: Step 1: Material preparation: First, prepare the materials, which include organic polymer, inorganic polymer, cross-linking agent, cationic monomer, electrolyte and water; Step 2: polymer preparation: put the organic polymer and the inorganic polymer into a mixer and mix them. During the mixing process, gradually add the cross-linking agent. The stirring time is 30-60 minutes. The stirring temperature is between 50℃ and 905℃. The speed is 1500r / min. After stirring for half an hour, keep the temperature for 0.5h, take out the material and place it at room temperature. Step 3: Liquid preparation: Mix the electrolyte and water and put them into a blender. The blending time is 10-15 minutes, the blending temperature is between 15℃ and 45℃, and the blender speed is 55r / min. After 10 minutes of blending, take it out and place it in a bucket for later use. Step 4: The content of the organic polymer and the inorganic polymer mixture is 20-40 parts, the electrolyte and water mixture is 60-80 parts, the cationic monomer is 4-50 parts, and the crosslinking agent is 5-45 parts; Step 5: The mixture of organic polymer and inorganic polymer is introduced into the reactor again, and during the mixing process, a mixture of electrolyte and water is gradually added. The mixing temperature is 20°C-40°C. The mixture of electrolyte and water is added once every 5 minutes, and the addition is completed in three times. After all the materials are added, continue mixing for 5-10 minutes to obtain a high cationic charge low molecular weight polymer.

2. A method for producing an anionic garbage capture agent according to claim 1, characterized in that: The electrolyte and water are stirred and mixed in a ratio of 1:9.

2.

3. A method for producing an anionic garbage capture agent according to claim 1, characterized in that: The organic polymer and the inorganic polymer are stirred and mixed in a ratio of 0.9:1.

1.

4. A method for producing an anionic garbage capture agent according to claim 1, characterized in that: The reactor is a reactor with a cooling device and a temperature control system.

5. A method for producing an anionic garbage capture agent according to claim 1, characterized in that: The cationic monomer is one of acryloyloxyethyl trimethyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, methacryloyloxypropyl trimethyl ammonium chloride and allyl trimethyl ammonium chloride, or a mixture of two of them.