A general-purpose binary flow and filtration aid, its method of use and application

Abstract

The application relates to the papermaking technical field, and particularly discloses a general-purpose binary flow-aiding and filtration-aiding agent, a use method thereof and application. The general-purpose binary flow-aiding and filtration-aiding agent can form a high-efficiency synergistic effect in the papermaking process of kraft paper and corrugated paper based on the synergistic mechanism of various additives, effectively improves the retention capacity of a paper machine wire part, and significantly enhances the filtration efficiency of water. The application also provides a use method suitable for the general-purpose binary flow-aiding and filtration-aiding agent. The method realizes the dual targets of improving the retention capacity of the wire part and optimizing the water filtration effect by accurately screening and adding appropriate additives before and after pulp flows through a pressure screen. The method solves the problem that the existing flow-aiding and filtration-aiding agent cannot be applied to various papermaking stock simultaneously.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking, in particular to a general type binary flow-aiding and filtration-aiding agent and a use method and application thereof. BACKGROUND

[0002] In the current domestic papermaking industry, the production process of kraft paper and corrugated paper mainly relies on waste paper raw materials to carry out the papermaking process. It is worth noting that because the waste paper raw materials used often undergo multiple recycling, the fibers undergo significant physical changes, specifically the fiber length is greatly shortened. During subsequent dewatering and forming operations in the paper machine net part, a large number of short fibers are difficult to effectively adhere to the paper structure, and then a large number of fibers are lost, which directly leads to a sharp decline in the net part retention rate, greatly increasing the manufacturing cost of the paper.

[0003] Due to the difference in terminal product demand of kraft paper and corrugated paper, the types of waste paper raw materials used are completely different, and accordingly, the amount of fillers and various chemicals added in the production process also has obvious differences. Under the combined action of the above factors, different types of retention aids are often introduced according to the waste paper raw materials to improve the retention rate of kraft paper and corrugated paper in the net part, minimize the loss of fine fibers and fillers, and effectively optimize the net part retention rate.

[0004] However, the current industry still faces a difficult problem to be overcome: there is a lack of a general type of retention and filtration aid that can simultaneously meet the addition needs of corrugated paper and kraft paper in the production process, and significantly improve the net part retention rate of both. Based on this technical difficulty, the present application is committed to in-depth research, aiming to develop a retention and filtration aid with high efficiency and versatility, and to provide solid technical support for the sustainable development of kraft paper and corrugated paper industry. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a general type flow-aiding and filtration-aiding agent and a use method and application thereof, to solve the problem that the existing flow-aiding and filtration-aiding agent cannot be applied to improve the net part retention rate and the filtration amount of corrugated paper and kraft paper at the same time.

[0006] To achieve the above technical purpose, the present application provides a general type binary flow-aiding and filtration-aiding agent, which comprises a high molecular retention aid and a microparticle retention aid.

[0007] The high molecular retention aid is one of high molecular retention aid 888 and high molecular retention aid B; the microparticle retention aid is one of microparticle retention aid 666 and microparticle retention aid A.

[0008] Further, the total amount of the high molecular retention aid and the microparticle retention aid is 700 PPM.

[0009] Further, the high molecular retention aid is high molecular retention aid 888; the micro-particle retention aid is micro-particle retention aid 666.

[0010] Further, the high molecular retention aid is high molecular retention aid 888; the micro-particle retention aid is micro-particle retention aid A.

[0011] Further, the high molecular retention aid is high molecular retention aid B; the micro-particle retention aid is micro-particle retention aid A.

[0012] Further, the high molecular retention aid 888 is a white powder prepared by N, N, N-trimethyl-2- (1-oxo-2-propenyl oxy) ethyl ammonium chloride-acrylamide copolymer and water in a mass ratio of 80-90 %:10-20 %, with a molecular weight of 100-200 million, an ionic degree of 30-50, and a density of 0.5-0.7 g / cm 3 ; the micro-particle retention aid 666 is a white emulsion prepared by acryl ethyl trimethyl ammonium chloride-acrylamide copolymer, ammonium sulfate and water in a mass ratio of 40-50 %:20-40 %:20-40 %, with a molecular weight of 400-700 million, an ionic degree of 40-60, and a density of 1.0-1.2 g / cm 3 .

[0013] The application provides a use method of a general type binary flow aid and filtration aid, comprising the following steps:

[0014] In step S1, after the pulp flows through a pulp pump, a high molecular retention aid solution accounting for 0.2-0.6 ‰ of the total mass of the pulp is added and uniformly mixed;

[0015] In step S2, after uniform mixing, the pulp is passed through a pressure screen, and then a micro-particle retention aid solution accounting for 0.2-0.6 ‰ of the total mass of the pulp is added to the pulp passing through the pressure screen and uniformly mixed.

[0016] Further, the addition amount of the high molecular retention aid solution accounts for 0.02-0.06 ‰ of the total mass of the pulp; the addition amount of the micro-particle retention aid solution accounts for 0.02-0.06 ‰ of the total mass of the pulp.

[0017] Further, the mass concentration of the high molecular retention aid in the high molecular retention aid solution is 0.1-0.3 %; the mass concentration of the micro-particle retention aid in the micro-particle retention aid solution is 0.4-0.6 %.

[0018] The application provides a general type binary flow aid and filtration aid or an application of the use method of the general type binary flow aid and filtration aid, which is used for preparing kraft paper and corrugated paper.

[0019] In summary, the application innovatively proposes a general-purpose binary flow-aiding and filtration-aiding agent. The flow-aiding and filtration-aiding agent can form a high-efficiency synergistic effect in the papermaking process based on the synergistic mechanism of multiple additives, effectively improving the retention capacity of the paper machine wire part, and significantly enhancing the filtration efficiency of water, laying a solid foundation for the quality improvement and efficiency increase of the papermaking process. Compared with the prior art, the general-purpose flow-aiding and filtration-aiding agent developed in the application exhibits excellent versatility, making it perfectly adapt to the production needs of two different paper products, namely, kraft paper and corrugated paper.

[0020] The application also provides a use method suitable for the above-mentioned general-purpose binary flow-aiding and filtration-aiding agent. The method mainly selects and adds appropriate additives before and after the pulp flows through the pressure screen. This stage-by-stage and targeted additive addition strategy greatly improves the overall use efficiency of the additives. The use method provided by the application can significantly improve the retention capacity of the wire part and optimize the water filtration effect by adding a small amount of additives, providing a new technical path for the sustainable development of the papermaking industry. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 Mechanism diagram of the retention and filtration aid provided by the embodiment of the application and the coagulation of the pulp;

[0023] Figure 2 Mechanism diagram of the high-molecular retention aid 888 provided by the embodiment of the application and the coagulation of the pulp;

[0024] Figure 3 Mechanism diagram of the general-purpose binary flow-aiding and filtration-aiding agent provided by the embodiment of the application and the coagulation of the pulp;

[0025] Figure 4 Addition process flow chart of the general-purpose binary flow-aiding and filtration-aiding agent provided by the embodiment of the application;

[0026] Figure 5 Addition process flow chart of the general-purpose binary flow-aiding and filtration-aiding agent provided by the comparative example 1 of the application;

[0027] Figure 6 Addition process flow chart of the general-purpose binary flow-aiding and filtration-aiding agent provided by the comparative example 2 of the application;

[0028] Figure 7The adding process flow and device physical map of the general binary flow-aiding and filtration-aiding agent provided by the embodiment of the application are provided. DETAILED DESCRIPTION

[0029] The technical solutions of the embodiments of the application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the specification of the application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of the application.

[0030] In the application, all raw materials are not particularly limited in source, and can be purchased on the market or prepared according to the conventional method known to those skilled in the art.

[0031] The application provides a general binary flow-aiding and filtration-aiding agent, which comprises a high-molecular retention aid and a microparticle retention aid.

[0032] The high-molecular retention aid is one of high-molecular retention aid 888 and high-molecular retention aid B, and the microparticle retention aid is one of microparticle retention aid 666 and microparticle retention aid A.

[0033] It should be noted that in the papermaking process, the pulp fibers are usually negatively charged, and the retention aid plays a key role. The high-molecular retention aid 888 / high-molecular retention aid B has a positive charge, and by means of the mechanism of electrical neutralization and bridge adsorption, it can interact with the pulp fibers to make them gather to form relatively large agglomerates. This process not only significantly increases the retention rate of substances such as pulp fibers in the papermaking wire part, but also greatly accelerates the dewatering process of the wire part. Since the high-molecular retention aid 888 / high-molecular retention aid B itself has a large molecular weight, the size of the formed agglomerated flocs is also large, so its main function focuses on strengthening the retention performance of the wire part, but this will also have a greater impact on the uniformity of the paper to some extent. Unlike this, the microparticle retention aid 666 / microparticle retention aid A also has a positive charge, which has an electrical neutralization and bridge adsorption effect with the negatively charged fine fibers and fillers, and gathers into relatively small agglomerates and adheres to the surface of the large fibers. In this way, the retention of substances such as fine fibers and fillers in the wire part is improved, and the dewatering speed of the wire part is also accelerated. The microparticle retention aid 666 / microparticle retention aid A has a small molecular weight, resulting in small flocs, and its core advantage lies in being able to focus on improving the drainage performance of the wire part, and also helping to improve the uniformity of the paper. In the embodiment, the high-molecular retention aid B and the microparticle retention aid A are purchased from Solenis (Shanghai) Chemical Co., Ltd.

[0034] In some embodiments, the total amount of the high-molecular retention aid and the microparticle retention aid is 700 PPM.

[0035] In some embodiments, the polymeric retention aid is Polymin 888; the microparticulate retention aid is Microparticulate retention aid 666.

[0036] In some embodiments, the polymeric retention aid is Polymin 888; the microparticulate retention aid is Microparticulate retention aid A.

[0037] In some embodiments, the polymeric retention aid is Polymin B; the microparticulate retention aid is Microparticulate retention aid A.

[0038] In some embodiments, the Polymin 888 is a white powder prepared from N, N, N-trimethyl-2-(1-oxo-2-propenyl oxy) ethyl ammonium chloride-acrylamide copolymer and water in a mass ratio of 80-90%:10-20%, with a molecular weight of 100-200 million, an ionic degree of 30-50, and a density of 0.5-0.7 g / cm 3 ; the Microparticulate retention aid 666 is a white emulsion prepared from acryl ethyl trimethyl ammonium chloride-acrylamide copolymer, ammonium sulfate and water in a mass ratio of 40-50%:20-40%:20-40%, with a molecular weight of 400-700 million, an ionic degree of 40-60, and a density of 1.0-1.2 g / cm 3 .

[0039] The present application provides a method for using a general-purpose binary flow and filtration aid, comprising the following steps:

[0040] Step S1, after the pulp flows through the pulp pump, a polymeric retention aid solution accounting for 0.2-0.6% of the total mass of the pulp is added and mixed uniformly;

[0041] Step S2, after being mixed uniformly, the pulp is passed through a pressure screen, and then a microparticulate retention aid solution accounting for 0.2-0.6% of the total mass of the pulp is added to the pulp passing through the pressure screen and mixed uniformly.

[0042] In some embodiments, the dosage of the polymeric retention aid solution accounts for 0.02-0.06% of the total mass of the pulp; the dosage of the microparticulate retention aid solution accounts for 0.02-0.06% of the total mass of the pulp.

[0043] In some embodiments, the mass concentration of the polymeric retention aid in the polymeric retention aid solution is 0.1-0.3%; the mass concentration of the microparticulate retention aid in the microparticulate retention aid solution is 0.4-0.6%.

[0044] The applicant further provides the following reference specific embodiments for describing the present application, and it should be noted that these embodiments are merely descriptive and do not limit the present application in any way.

[0045] Example 1

[0046] The embodiment provides a preparation method of a high molecular retention aid and a microparticle retention aid 666 and a solution thereof, and specifically as follows:

[0047] The high molecular retention aid 888 is a white powder prepared from 80% of N, N, N-trimethyl-2-(1-oxo-2-propenyl oxy) ethyl ammonium chloride-acrylamide copolymer and 20% of water in terms of mass fraction, has a molecular weight of 10-20 million, an ionic degree of 30-50, and a density of 0.5-0.7 g / cm 3 ; the high molecular retention aid 888 is dissolved in water to prepare a high molecular retention aid 888 solution with a mass concentration of 0.1%.

[0048] The microparticle retention aid 666 is a white emulsion prepared from 40% of acryloyl ethyl trimethyl ammonium chloride-acrylamide copolymer, 20% of ammonium sulfate and 20% of water in terms of mass fraction, has a molecular weight of 4-7 million, an ionic degree of 40-60, and a density of 1.0-1.2 g / cm 3 ; the microparticle retention aid 666 is dissolved in water to prepare a microparticle retention aid 666 solution with a mass concentration of 0.4%.

[0049] Referring to Figure 1 and Figure 7 , the embodiment provides a use method of a general type binary retention and drainage aid, and specific steps are as follows:

[0050] In step S1, after the kraft paper pulp / corrugated paper pulp flows through a pulp pump, 400 PPM of the high molecular retention aid 888 solution is added at a position 2.5 meters away from a pressure screen of a paper machine flow system (as shown in Figure 7 , the high molecular retention aid is arranged in a retention aid adding pipe, the retention aid adding pipe is installed on a slurry pipeline between the pulp pump and the pressure screen, the retention aid is added to the slurry pipeline through the retention aid adding pipe to be mixed with the pulp), and after mixing for 2-3 s, the pulp enters the pressure screen; the kraft paper pulp is AOCC waste paper; the corrugated paper pulp is composed of high-end domestic waste and low-end domestic waste in a mass ratio of 1:1.

[0051] In step S2, after the pulp passes through the pressure screen, the microparticle retention aid 666 solution is added to the slurry pipeline through a retention aid adding pipe installed on the slurry pipeline after the pressure screen at a position 1 meter away from the pressure screen, and after mixing for 5-10 s, the pulp finally flows into a headbox.

[0052] Embodiments 2-9

[0053] The difference between the embodiment 1 and the embodiments 2-9 lies in that the addition amount or type of the retention and drainage aid is different, and specific reference can be made to Table 1.

[0054] Examples 10-12

[0055] The difference from Example 1 is that the pulp is composed of high-end and low-end waste paper in a mass ratio of 1:1 for preparing corrugated paper; and the addition amount of the retention and drainage aid is different, see Table 2 for details.

[0056] Comparative Example 1

[0057] Referring to Figure 2 The application provides an adding method of a binary retention and drainage aid, and the specific steps are as follows:

[0058] Step S1, after the pulp flows through the pulp pump, 400 PPM of the macromolecular retention aid 888 solution and 300 PPM of the microparticle retention aid 666 solution are added at a distance of 2.5 meters from the pressure screen of the paper machine flow system, mixed for 2-3 seconds, passed through the pressure screen, and finally flowed into the headbox.

[0059] Comparative Example 2

[0060] Referring to Figure 3 The application provides an adding method of a binary retention and drainage aid, and the specific steps are as follows:

[0061] Step S1, after the pulp flows through the pulp pump, 300 PPM of the microparticle retention aid 666 solution is added at a distance of 2.5 meters from the pressure screen of the paper machine flow system, mixed for 2-3 seconds;

[0062] Step S2, the mixed pulp passes through the pressure screen, 400 PPM of the macromolecular retention aid 888 solution is added at a distance of 1 meter from the pressure screen, mixed for 5-10 seconds, and finally flows into the headbox.

[0063] Comparative Example 3

[0064] The difference from Example 1 is that only 100 PPM of the macromolecular retention aid 888 solution is added.

[0065] Comparative Example 4

[0066] The difference from Example 1 is that no retention and drainage aid is added.

[0067] Comparative Example 5

[0068] The difference from Comparative Example 4 is that the pulp is used for preparing corrugated paperboard and is composed of high-end and low-end waste paper in a mass ratio of 1:1.

[0069] The wire section retention rate and the drainage amount in the above examples and comparative examples are tested, and the improvement rate compared with the blank example is calculated, and the results are shown in Tables 1-2.

[0070] Table 1. Effect of binary universal retention and drainage system on the preparation process of kraft paper

[0071]

[0072] As can be clearly seen from the data in Table 1, in the multiple embodiments of the present study, the binary universal retention and drainage system exhibits significant advantages. Among them, examples 1-6 select microparticle retention aid 666 and high molecular retention aid 888 for combination, and compared with the blank control group, the wire part retention rate and the water filtration volume are significantly improved; especially examples 1 and 5 have the best improvement effect, the wire part retention rate is improved by more than 18%, and the increase of water filtration volume is more than 40%, which shows that the combination has excellent performance in improving the retention and drainage performance of pulp. Similarly, examples 6-7 use high molecular retention aid 888 and microparticle retention aid A to synergistically improve the wire part retention rate and the water filtration volume; the improvement effect of example 7 is the most significant, the wire part retention rate is improved by 28.5% compared with the blank, and the water filtration volume is improved by more than 50.2%, which further verifies the strong optimization effect of different additive combinations on key indicators of papermaking process. Furthermore, examples 8-9 use high molecular retention aid B and microparticle retention aid A to build a binary system, the wire part retention rate of example 9 is improved by 24.6%, and the water filtration volume is improved by more than 49.5%, which continues to prove the effectiveness of such binary universal retention and drainage system. In summary, the binary universal retention and drainage system combination formed by high molecular retention aid 888 / high molecular retention aid B and microparticle retention aid 666 / microparticle retention aid A respectively proposed in the present application has significant improvement effect on the wire part retention rate and the water filtration volume.

[0073] In order to further explore the additive dosing strategy of each embodiment, it is found that example 1 adopts a staged dosing method, that is, different additives are accurately dosed before and after the pulp flows through the pressure screen. In contrast, comparative example 1 adopts the method of simultaneously adding two kinds of additives before screening, and comparative example 2 adds microparticle retention aid and high molecular retention aid before and after the pressure screen, respectively. The experimental results show that example 1 exhibits more prominent advantages in the two key indicators of wire part retention rate and water filtration volume compared with comparative examples. This difference fully reveals that the staged and sequential addition of additives can fully develop the synergistic potential of the binary universal retention and drainage system.

[0074] Table 2. Effect of binary universal retention and drainage system on the preparation process of corrugated paper

[0075]

[0076] According to the data analysis in Table 2, it can be concluded that the retention and drainage of the corrugated paper in the preparation process can be effectively improved by using the retention and drainage system constructed by the polymer retention aid 888 and the particulate retention aid 666. Especially when the addition amount of the polymer retention aid 888 is accurately controlled at 500 PPM, and the addition amount of the particulate retention aid 666 is maintained at 300 PPM, the retention and drainage of the corrugated paper in the preparation process are in the best state.

[0077] In summary, the binary universal retention and drainage system provided by the present application, which takes the polymer retention aid 888 / polymer retention aid B and the particulate retention aid 666 / particulate retention aid A as the core, can effectively improve the retention and drainage of the paper in the preparation process of the kraft paper and the corrugated paper. It is particularly important to follow the time sequence principle that the polymer retention aid is added first and the particulate retention aid is added later in the actual application process, to improve the beneficial effects of the system, and to provide solid technical support for the efficient and high-quality development of the paper industry.

[0078] The above is only a preferred embodiment of the present application and does not limit the present application. Although the present application has been described in detail with reference to the examples, those skilled in the art can still modify the technical solutions described in the examples or make equivalent replacements to some technical features, but any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for using a general-purpose binary flow aid and filter aid, characterized in that, The general-purpose binary flow aid and filter aid includes polymeric retention aids and microparticle retention aids; The polymeric retention aid is polymeric retention aid 888; The microparticle retention aid is microparticle retention aid 666; The polymeric retention aid 888 is a white powder formulated from N,N,N-trimethyl-2-(1-oxo-2-propenyloxy)ethylammonium chloride-acrylamide copolymer and water in a mass ratio of 80-90%:10-20%, with a molecular weight of 10-20 million, an ionic degree of 30-50, and a density of 0.5-0.7 g / cm³. 3 ; The microparticle retention aid 666 is a white emulsion formulated from acryloylethyltrimethylammonium chloride-acrylamide copolymer, ammonium sulfate, and water in a mass ratio of 40-50%:20-40%:20-40%, with a molecular weight of 4-7 million, an ionic degree of 40-60, and a density of 1.0-1.2 g / cm³. 3 ; The general-purpose binary flow aid and filter aid is used to prepare kraft paper and corrugated paper. The method of using the general-purpose binary flow aid and filter aid in the preparation of kraft paper and corrugated paper is as follows: Step S1, after the pulp flows through the pulp pump, a polymer retention aid solution accounting for 0.2~0.6‰ of the total pulp mass is added and mixed evenly; Step S2, after even mixing, the pulp is passed through a pressure screen, and then a microparticle retention aid solution accounting for 0.2~0.6‰ of the total pulp mass is added to the pulp passing through the pressure screen and mixed evenly.

2. The method of using the general-purpose binary flow aid and filter aid according to claim 1, characterized in that, The amount of the polymer retention aid solution added is 0.02~0.06‰ of the total mass of pulp; the amount of the microparticle retention aid solution added is 0.02~0.06‰ of the total mass of pulp.

3. The method of using the general-purpose binary flow aid and filter aid according to claim 2, characterized in that, The polymer retention aid solution has a polymer retention aid concentration of 0.1-0.3% by mass; the microparticle retention aid solution has a microparticle retention aid concentration of 0.4-0.6% by mass.

4. The application of a method for using the general-purpose binary flow aid and filter aid as described in any one of claims 1 to 3, characterized in that, Used for the production of kraft paper and corrugated paper.

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