Universal binary flow and filter aid as well as use method and application thereof

Abstract

The invention relates to the technical field of papermaking, and particularly discloses a universal binary flow and filter aid as well as a use method and application thereof. According to the universal binary flow and filter aid, an efficient synergistic effect can be formed in the papermaking process of craft paper and corrugated paper based on a synergistic effect mechanism of multiple auxiliaries, the retention capacity of a net part of a paper machine is practically and effectively improved, and meanwhile, the filtration efficiency on water is remarkably enhanced. The invention further provides a using method matched with the universal binary flow and filter aid, and the dual purposes of improving the net part retention capacity and optimizing the water filtering effect are achieved mainly at the two key nodes before and after paper pulp flows through a pressure screen through precise screening and adding of appropriate auxiliaries. The problem that an existing flow and filter aid cannot be applied to various papermaking raw pulp at the same time is solved.

Description

Technical Field

[0001] The present application relates to the field of papermaking technology, and in particular to a universal binary flow-aid and filter-aid and a use method and application thereof. Background Art

[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 papermaking. It is worth noting that because the waste paper raw materials used often undergo multiple recycling, the fibers undergo significant physical changes, which is specifically manifested in a significant reduction in fiber length. During the subsequent dehydration and forming operation in the paper machine mesh, a large number of short fibers are difficult to effectively adhere to the paper sheet structure, resulting in a large amount of fiber loss, which directly leads to a sharp decline in the mesh retention rate and greatly increases the manufacturing cost of paper.

[0003] Due to the difference in the end product demand for kraft paper and corrugated paper, the types of waste paper raw materials used are completely different. Correspondingly, in order to adapt to the different characteristics of waste paper, the amount of fillers and various chemicals added in the production process is also significantly different. Under the combined effect 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 on the wire, minimize the loss of fine fibers and fillers, and achieve effective optimization of the retention rate of the wire.

[0004] However, the industry is still facing a difficult problem that needs to be solved: the lack of a universal retention and drainage aid that can simultaneously meet the addition requirements of both corrugated paper and kraft paper in the production process and significantly improve the wire retention rate of both. Based on this technical dilemma, the present invention patent is committed to conducting in-depth research, aiming to develop a retention and drainage aid that is both efficient and universal, providing solid technical support for promoting the sustainable development of the kraft paper and corrugated paper industries. Summary of the invention

[0005] In view of this, the purpose of this application is to provide a universal flow aid and filter aid and its use method and application, which is used to solve the problem that flow aid and filter aid in the prior art cannot be used to simultaneously improve the mesh retention rate and water filtration volume of corrugated paper and kraft paper.

[0006] In order to achieve the above technical purpose, the present application provides a universal binary flow aid and filter aid, including a polymer retention aid and a microparticle retention aid;

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

[0008] Furthermore, the total amount of the polymer retention aid and the microparticle retention aid is 700 PPM.

[0009] Furthermore, the polymer retention aid is polymer retention aid 888; and the microparticle retention aid is microparticle retention aid 666.

[0010] Furthermore, the polymer retention aid is polymer retention aid 888; and the microparticle retention aid is microparticle retention aid A.

[0011] Furthermore, the polymer retention aid is polymer retention aid B; and the microparticle retention aid is microparticle retention aid A.

[0012] Furthermore, the polymer retention aid 888 is a white powder prepared by mixing 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 ionicity of 30-50, and a density of 0.5-0.7 g / cm 3 ; Microparticle retention aid 666 is a white emulsion prepared 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 million to 7 million, an ionicity of 40 to 60, and a density of 1.0 to 1.2 g / cm 3 .

[0013] The present application provides a method for using a universal binary flow-aid filter aid, comprising the following steps:

[0014] Step S1, after the pulp flows through the flushing pump, a polymer retention aid solution accounting for 0.2-0.6‰ of the total mass of the pulp is added and mixed evenly;

[0015] Step S2, after uniform mixing, the pulp is passed through a pressure screen, and then a microparticle retention agent 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 the mixture is uniformly mixed.

[0016] Furthermore, the addition amount of the polymer retention agent solution accounts for 0.02-0.06‰ of the total mass of the pulp; the addition amount of the microparticle retention agent solution accounts for 0.02-0.06‰ of the total mass of the pulp.

[0017] Furthermore, the mass concentration of the polymer retention aid in the polymer retention aid solution is 0.1-0.3%; the mass concentration of the microparticle retention aid in the microparticle retention agent solution is 0.4-0.6%.

[0018] The present application provides an application of a universal binary flow-aid and filter-aid or a method for using the universal binary flow-aid and filter-aid, which is used for preparing kraft paper and corrugated paper.

[0019] In summary, the present application innovatively proposes a universal binary flow-aid and filter-aid. The flow-aid and filter-aid is based on the synergistic mechanism of multiple additives, which enables it to form an efficient synergistic effect in the papermaking process, effectively and efficiently improve the retention capacity of the paper machine mesh, and at the same time significantly enhance the filtration efficiency of moisture, laying a solid foundation for improving the quality and efficiency of the papermaking process. Compared with the prior art, the universal flow-aid and filter-aid developed by the present application exhibits an excellent versatility advantage, enabling it to perfectly adapt to the production needs of two different paper products, kraft paper and corrugated paper.

[0020] The present application also provides a method of use that is compatible with the above-mentioned universal binary flow-aid and filter-aid, which mainly screens and adds appropriate additives at the two key nodes before and after the pulp flows through the pressure screen. This phased and targeted additive addition strategy greatly improves the comprehensive use efficiency of additives; the method of use provided by the present application only requires a small amount of additives to significantly improve the net retention capacity and optimize the moisture filtration effect, providing a new technical path for the sustainable development of the papermaking industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A diagram showing the mechanism of coagulation between the retention and drainage aid provided in the embodiments of the present application and the pulp;

[0023] Figure 2 This is a diagram showing the mechanism of coagulation between the polymer retention aid 888 provided in the embodiment of the present application and the pulp;

[0024] Figure 3 This is a diagram showing the mechanism of coagulation between the universal binary flow-aid and filter-aid provided in the embodiments of the present application and the pulp;

[0025] Figure 4 A flow chart of the addition process of a universal binary flow-aid and filter-aid agent provided in an embodiment of the present application;

[0026] Figure 5 A flow chart of the addition process of a universal binary flow-aid and filter-aid provided in Comparative Example 1 of the present application;

[0027] Figure 6 A flow chart of the addition process of a universal binary flow-aid and filter-aid provided in Comparative Example 2 of the present application;

[0028] Figure 7This is a flow chart of the addition process of a universal binary flow-aid and filter-aid provided in an embodiment of the present application and a physical diagram of the device. DETAILED DESCRIPTION

[0029] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the specification of the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection requested by the present application.

[0030] The sources of all raw materials in the present invention are not particularly limited and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0031] The present application provides a universal binary flow aid and filter aid, including a polymer retention aid and a microparticle retention aid;

[0032] The polymer retention aid is one of polymer retention aid 888 and polymer retention aid B; 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, pulp fibers are usually negatively charged, and retention agents play a key role. Among them, polymer retention aid 888 / polymer retention aid B carries a positive charge. With the mechanism of charge neutralization and bridging adsorption, it can interact with pulp fibers to aggregate them into relatively large agglomerates. This process not only significantly increases the retention rate of pulp fibers and other substances in the papermaking mesh, but also greatly accelerates the dehydration process of the mesh. Since polymer retention aid 888 / polymer retention aid B itself has a large molecular weight and the size of the agglomerated flocs formed is also large, its main function focuses on strengthening the retention performance of the mesh. However, this will also have a greater impact on the uniformity of the finished paper to a certain extent. In contrast, microparticle retention aid 666 / microparticle retention aid A also carries a positive charge. It undergoes charge neutralization and bridging adsorption with negatively charged fine fibers and fillers, aggregates into relatively small agglomerates, and adheres to the surface of large fibers. In this way, the retention of fine fibers, fillers and other materials on the wire is improved, and the dewatering speed of the wire is also accelerated. Microparticle retention aid 666 / microparticle retention aid A has a small molecular weight, and the flocs created are also small. Its core advantage is that it can focus on improving the water filtration performance of the wire, and it also helps to improve the uniformity of the finished paper. In this embodiment, polymer retention aid B and microparticle retention aid A were purchased from Solenis (Shanghai) Chemical Co., Ltd.

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

[0035] In some embodiments, the polymer retention aid is polymer retention aid 888 ; the microparticle retention aid is microparticle retention aid 666 .

[0036] In some embodiments, the polymer retention aid is polymer retention aid 888; the microparticle retention aid is microparticle retention aid A.

[0037] In some embodiments, the polymer retention aid is polymer retention aid B; and the microparticle retention aid is microparticle retention aid A.

[0038] In some embodiments, polymer retention aid 888 is a white powder prepared by mixing 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 ionicity of 30-50, and a density of 0.5-0.7 g / cm 3 ; Microparticle retention aid 666 is a white emulsion prepared 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 million to 7 million, an ionicity of 40 to 60, and a density of 1.0 to 1.2 g / cm 3 .

[0039] The present application provides a method for using a universal binary flow-aid filter aid, comprising the following steps:

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

[0041] Step S2, after uniform mixing, the pulp is passed through a pressure screen, and then a microparticle retention agent 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 the mixture is uniformly mixed.

[0042] In some embodiments, the addition amount of the polymer retention agent solution accounts for 0.02-0.06‰ of the total mass of the pulp; the addition amount of the microparticle retention agent solution accounts for 0.02-0.06‰ of the total mass of the pulp.

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

[0044] The applicant further provides the following reference specific embodiments to describe the present invention. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0045] Example 1

[0046] This embodiment provides a method for preparing a polymer retention agent and a microparticle retention agent 666 and a solution thereof, which is specifically as follows:

[0047] Polymer retention agent 888 is a white powder prepared from 80% by mass of N, N, N-trimethyl-2-(1-oxo-2-propenyloxy)ethylammonium chloride-acrylamide copolymer and 20% by mass of water. It has a molecular weight of 10-20 million, an ionicity of 30-50, and a density of 0.5-0.7 g / cm 3 ; Take polymer retention agent 888 and dissolve it in water to prepare a polymer retention agent 888 solution with a mass concentration of 0.1%.

[0048] Microparticle retention agent 666 is a white emulsion made of 40% acryloylethyltrimethylammonium chloride-acrylamide copolymer, 20% ammonium sulfate and 20% water. It has a molecular weight of 4-7 million, an ionicity of 40-60, and a density of 1.0-1.2 g / cm 3 ; Take microparticle retention agent 666 and dissolve it in water to prepare a microparticle retention agent 666 solution with a mass concentration of 0.4%.

[0049] See also Figure 1 and Figure 7 The present application embodiment provides a method for using a universal binary retention and drainage aid, and the specific steps are as follows:

[0050] Step S1, after the kraft paper pulp / corrugated paper pulp flows through the flushing pump, a 400 PPM polymer retention aid 888 solution is added at a distance of 2.5 meters from the pressure screen of the paper machine flow system (such as Figure 7 As shown, the polymer retention agent is installed in the retention agent addition tube, and the retention agent addition tube is installed on the pulp pipeline between the pulping pump and the pressure screen. The retention agent is added into the pulp pipeline through the retention agent addition tube and mixed with the pulp), and after mixing for 2-3 seconds, it 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] Step S2, after the pulp passes through the pressure screen, the microparticle retention agent 666 solution is added into the slurry pipeline through the retention agent adding pipe installed on the slurry pipeline after the pressure screen at a distance of 1 meter from the pressure screen, mixed for 5 to 10 seconds, and finally flows into the headbox.

[0052] Embodiments 2 to 9

[0053] The difference from Example 1 is that the amount or type of retention and drainage aids added is different, see Table 1 for details.

[0054] Embodiment 10-12

[0055] The difference from Example 1 is that the pulp is composed of high-end domestic waste and low-end domestic waste in a mass ratio of 1:1, and is used to prepare corrugated paper; and the added amounts of retention and drainage aids are different, see Table 2 for details.

[0056] Comparative Example 1

[0057] See also Figure 2 The present application provides a method for adding a binary retention and drainage aid, and the specific steps are as follows:

[0058] Step S1, after the pulp flows through the flushing pump, 400 PPM of polymer retention aid 888 solution and 300 PPM of microparticle retention aid 666 solution are added 2.5 meters away 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] See also Figure 3 The present application provides a method for adding a binary retention and drainage aid, and the specific steps are as follows:

[0061] Step S1, after the pulp flows through the flushing pump, add 300PPM of microparticle retention agent 666 solution at a distance of 2.5 meters from the pressure screen of the paper machine flow system and mix for 2-3S;

[0062] Step S2, the mixed slurry passes through a pressure screen, and 400 PPM of a polymer retention aid 888 solution is added 1 meter away from the pressure screen, mixed for 5 to 10 seconds, and finally flows into a headbox.

[0063] Comparative Example 3

[0064] The difference from Example 1 is that only 100 PPM of the polymer 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 to prepare corrugated board and is composed of high-end domestic waste and low-end domestic waste in a mass ratio of 1:1.

[0069] The net retention rate and water filtration rate in the above embodiments and comparative examples were tested, and the improvement rate compared with the blank embodiment was calculated, and the results are shown in Tables 1-2.

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

[0071]

[0072] It is clear from the data in Table 1 that in multiple embodiments of this study, the binary universal retention and drainage aid system shows significant advantages. Among them, Examples 1 to 6 use a combination of microparticle retention aid 666 and polymer retention aid 888. Compared with the blank control group, the net retention rate and the amount of filtered water are significantly improved; especially Examples 1 and 5 have the best improvement effect, and their net retention rate has achieved a significant increase of more than 18%, and the increase in the amount of filtered water is also more than 40%, which shows that the combination has excellent performance in improving pulp retention and drainage performance. Similarly, Examples 6 to 7 use polymer retention aid 888 and microparticle retention aid A to synergize to improve the net retention rate and the amount of filtered water; the improvement effect of Example 7 is the most significant, and its net retention rate is increased by 28.5% compared with the blank, and the amount of filtered water is increased 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 and 9 use polymer retention aid B and microparticle retention aid A to construct a binary system. The wire retention rate of Example 9 is increased by 24.6%, and the filtration volume is increased by more than 49.5%, which continuously proves the effectiveness of such binary universal retention and drainage aids. In summary, the binary universal retention and drainage aid combination formed by compounding polymer retention aid 888 / polymer retention aid B with microparticle retention aid 666 / microparticle retention aid A proposed in this application has a significant effect on improving the wire retention rate and filtration volume.

[0073] In order to further explore the additive dosing strategies of each embodiment, it was found that embodiment 1 adopted a staged dosing method, that is, different additives were accurately added before and after the pulp flowed through the pressure screen. In contrast, comparative example 1 adopted a method of adding two additives at the same time before screening, while comparative example 2 added a microparticle retention aid and a polymer retention aid respectively before and after passing the pressure screen. The experimental results show that compared with the comparative example, the embodiment shows more prominent advantages in the two key indicators of mesh retention rate and water filtration. This difference fully reveals that the staged and sequential addition of additives can give full play to the synergistic potential of binary universal retention and filtration aids.

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

[0075]

[0076] According to the data analysis in Table 2, the retention and drainage agent system constructed by the polymer retention agent 888 and the microparticle retention agent 666 in the present application can effectively improve the mesh retention rate and the amount of filtered water in the corrugated paper preparation process. In particular, when the addition amount of the polymer retention agent 888 is precisely controlled at 500 PPM, and the addition amount of the microparticle retention agent 666 is maintained at a specific ratio of 300 PPM, the mesh retention rate and the amount of filtered water in the preparation process of the corrugated paper are in the best state.

[0077] In summary, the binary universal retention and drainage agent system provided by this application with polymer retention agent 888 / polymer retention agent B and microparticle retention agent 666 / microparticle retention agent A as the core can effectively improve the net retention rate and water filtration volume in the preparation process of kraft paper and corrugated paper. It is particularly important that in the actual application process, the timing principle of adding the polymer retention agent first and the microparticle retention agent later is followed to improve the beneficial effects of the system and provide solid technical support for the efficient and high-quality development of the papermaking industry.

[0078] The above are only preferred embodiments of the present application and are not intended to limit the present invention. 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 recorded in the aforementioned examples or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A universal binary flow-aid filter aid, characterized in that: Including polymer retention aids and microparticle retention aids; The polymer retention aid is one of polymer retention aid 888 and polymer retention aid B; The microparticle retention aid is one of microparticle retention aid 666 and microparticle retention aid A.

2. The universal binary flow-aid filter aid according to claim 1, characterized in that: The total amount of the polymer retention aid and the microparticle retention aid is 700 PPM.

3. The universal binary flow-aid filter aid according to claim 1, characterized in that: The polymer retention aid is polymer retention aid 888; the microparticle retention aid is microparticle retention aid 666.

4. The universal binary flow-aid filter aid according to claim 1, characterized in that: The polymer retention aid is polymer retention aid 888; the microparticle retention aid is microparticle retention agent A.

5. The universal binary flow-aid and filter-aid according to claim 1, characterized in that: The polymer retention aid is polymer retention aid B; the microparticle retention aid is microparticle retention aid A.

6. The universal binary flow-aid filter aid according to claim 1, characterized in that: The polymer retention agent 888 is a white powder prepared by mixing 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 ionicity of 30-50, and a density of 0.5-0.7 g / cm 3 ; The microparticle retention aid 666 is a white emulsion prepared by 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 ionicity of 40-60, and a density of 1.0-1.2 g / cm 3 .

7. A method for using the universal binary flow-aid filter aid according to any one of claims 1 to 6, characterized in that: Step S1, after the pulp flows through the flushing pump, a polymer retention aid solution accounting for 0.2-0.6‰ of the total mass of the pulp is added and mixed evenly; Step S2, after uniform mixing, the pulp is passed through a pressure screen, and then a microparticle retention agent 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 the mixture is uniformly mixed.

8. The method for using the universal binary flow-aid and filter-aid according to claim 7, characterized in that: The addition amount of the polymer retention agent solution accounts for 0.02-0.06‰ of the total mass of the pulp; the addition amount of the microparticle retention agent solution accounts for 0.02-0.06‰ of the total mass of the pulp.

9. The method for using the universal binary flow-aid and filter-aid according to claim 8, characterized in that: The mass concentration of the polymer retention aid in the polymer retention aid solution is 0.1-0.3%; the mass concentration of the microparticle retention aid in the microparticle retention aid solution is 0.4-0.6%.

10. An application of the universal binary flow-aid filter-aid according to any one of claims 1 to 6 or the method for using the universal binary flow-aid filter-aid according to any one of claims 7 to 9, characterized in that: Used to prepare kraft paper and corrugated paper.

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