CN114855498B - Paper retention aid combination and use method thereof - Google Patents
Paper retention aid combination and use method thereof Download PDFInfo
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- CN114855498B CN114855498B CN202210402775.6A CN202210402775A CN114855498B CN 114855498 B CN114855498 B CN 114855498B CN 202210402775 A CN202210402775 A CN 202210402775A CN 114855498 B CN114855498 B CN 114855498B
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- 230000014759 maintenance of location Effects 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 36
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 125000002091 cationic group Chemical group 0.000 claims abstract description 21
- 229920006317 cationic polymer Polymers 0.000 claims abstract description 21
- 239000002245 particle Substances 0.000 claims abstract description 19
- 238000010008 shearing Methods 0.000 claims abstract description 16
- 239000007864 aqueous solution Substances 0.000 claims abstract description 15
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000008394 flocculating agent Substances 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 4
- 230000002787 reinforcement Effects 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 15
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000007872 degassing Methods 0.000 claims description 10
- 239000010954 inorganic particle Substances 0.000 claims description 6
- LTVDFSLWFKLJDQ-UHFFFAOYSA-N α-tocopherolquinone Chemical compound CC(C)CCCC(C)CCCC(C)CCCC(C)(O)CCC1=C(C)C(=O)C(C)=C(C)C1=O LTVDFSLWFKLJDQ-UHFFFAOYSA-N 0.000 claims description 5
- 229920001131 Pulp (paper) Polymers 0.000 claims description 4
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical group [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- PUVAFTRIIUSGLK-UHFFFAOYSA-M trimethyl(oxiran-2-ylmethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1CO1 PUVAFTRIIUSGLK-UHFFFAOYSA-M 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 2
- 229910000000 metal hydroxide Inorganic materials 0.000 claims description 2
- 150000004692 metal hydroxides Chemical class 0.000 claims description 2
- 150000001447 alkali salts Chemical class 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 9
- 239000000835 fiber Substances 0.000 abstract description 5
- 238000005189 flocculation Methods 0.000 abstract description 5
- 230000016615 flocculation Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 4
- 239000011859 microparticle Substances 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 abstract description 3
- 239000010813 municipal solid waste Substances 0.000 abstract description 2
- 238000010521 absorption reaction Methods 0.000 abstract 1
- 150000001450 anions Chemical class 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 12
- 238000002835 absorbance Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 7
- 229920002472 Starch Polymers 0.000 description 5
- 244000144992 flock Species 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000003623 enhancer Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010893 paper waste Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- HMHFERXOZSZRML-UHFFFAOYSA-M trimethyl-(3-methyloxiran-2-yl)azanium;chloride Chemical compound [Cl-].CC1OC1[N+](C)(C)C HMHFERXOZSZRML-UHFFFAOYSA-M 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000013019 agitation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 229920001661 Chitosan Polymers 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003002 pH adjusting agent Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F8/00—Chemical modification by after-treatment
- C08F8/30—Introducing nitrogen atoms or nitrogen-containing groups
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/10—Retention agents or drainage improvers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/18—Reinforcing agents
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a retention aid combination for paper and a use method thereof. The retention aid combination for paper comprises a flocculant, inorganic particulates, and a cationic polymer reinforcement. The cationic polymer reinforcing agent is prepared by regulating the pH value of a deaerated polyvinyl alcohol aqueous solution and then adding a cationic etherifying agent for reaction. The retention aid combination for paper is characterized in that anion garbage is bonded through the action of flocculants with enough positive charges to form a large flocculation system network, fine silica sol particles are added after shearing and scattering of the subsequent process, the scattered flocculants are pulled up under the action of positive and negative phase absorption, finally PVA molecules with moderate molecular weight and low cationic property are added to be adhered to electronegative particles and fibers, so that the retention of slurry is improved, the turbidity of water is reduced, the dry strength of paper is effectively enhanced, and the burst strength of finished paper is particularly obviously improved. The microparticle retention combination for paper can be added in the paper making process, so that the problem that PVA is difficult to retain in the paper making process is solved.
Description
Technical Field
The invention belongs to the field of papermaking, and particularly relates to a retention aid combination for paper and a use method thereof.
Background
The paper making raw materials mainly comprise waste paper, and the waste paper recycling brings a lot of impurities, such as paper starch, fillers, stickies and the like, which affect the operation of a paper machine and the quality of finished paper. In addition, the wastewater discharge amount in the paper industry is large, the wastewater is closed and recycled, a large amount of tiny fibers and chemicals with negative charges are accumulated in the water, and the use effects of conventional chemicals and retention and drainage aids are seriously interfered. How to improve the retention rate in the paper making process, reduce the solid content in the wastewater, save materials, save cost and improve the quality of paper, is an important subject of the wet part of paper making.
Conventional retention and drainage aids for the wet end of the paper are positively charged polymeric materials that aid retention by charge patching and bridging. The unitary retention is easy to form large flocks, the binary retention and the particle retention overcome the defects of the large flocks, the drainage speed and the paper forming quality are improved, especially the particle retention, cationic polymer is firstly added, the fibers form the large flocks, the particles with small particles, large surface area and obvious electronegativity are added at the position close to a paper machine through shearing and scattering of the subsequent process, and the fine flocks are formed, so that the retention of fine fibers, fillers and various chemicals is facilitated, and the paper forming uniformity is excellent. But the large flocks formed in the earlier stage of the particle retention are broken up, and the strength of the paper is affected. How to use the advantage of particle retention without reducing the enhancement of macromolecules is a technical problem to be solved.
Disclosure of Invention
The primary aim of the invention is to overcome the defects and shortcomings of the prior art and provide a retention aid combination for paper.
It is still another object of the present invention to provide a method of using the paper retention combination.
The aim of the invention is achieved by the following technical scheme:
a retention aid combination for paper comprising the following components: flocculant, inorganic particulates, and cationic polymer reinforcement.
Preferably, the flocculant, the inorganic particles and the cationic polymer reinforcing agent are used in a mass ratio of (1-5): 0.2-1): 0.5-1, more preferably in a mass ratio of (1-5): 0.3-0.5): 0.8-1, and most preferably in a mass ratio of 1:0.5:1.
The flocculant is preferably at least one of chitosan, aluminum sulfate, alum, polyaluminium chloride and other water treatment agents with flocculation effect.
The inorganic fine particles are preferably silica sol having a very small particle size and electronegativity, and more preferably silica sol having a particle size of 8 nm.
The cationic polymer reinforcement is preferably cationic polyvinyl alcohol.
The cationic polyvinyl alcohol is prepared by the following steps:
(1) Adding water into polyvinyl alcohol (PVA) for dissolution to obtain a polyvinyl alcohol aqueous solution; degassing to obtain a degassed polyvinyl alcohol aqueous solution;
(2) Adding a pH regulator into the deaerated polyvinyl alcohol aqueous solution obtained in the step (1) to regulate the pH value of the mixture;
(3) And (3) adding a cationic etherifying agent into the mixture obtained in the step (2), reacting, cooling, and discharging to obtain the cationic polyvinyl alcohol.
Preferably, the steps (1), (2) and (3) are performed under stirring conditions; more preferably, the stirring speed is 300 to 500rpm.
The polyvinyl alcohol described in step (1) is preferably PVA1788 or PVA1799.
The concentration of the aqueous polyvinyl alcohol solution in the step (1) is preferably 10% by mass.
The degassing in the step (1) is standing degassing or vacuumizing degassing.
The pH adjuster in step (2) is preferably a weak acid strong base salt or a metal hydroxide, more preferably sodium hydroxide.
The pH of the conditions described in step (2) is preferably adjusted to a pH of 9 to 10, more preferably adjusted to a ph=9.
The cationic etherifying agent in the step (3) is 3-chloro-2-hydroxypropyl-trimethyl ammonium Chloride (CTA) or 2, 3-epoxypropyl trimethyl ammonium chloride (ETA).
The addition amount of the cationic etherifying agent in the step (3) is 1-5% of the dry weight of the polyvinyl alcohol.
The reaction conditions in step (3) are preferably those at 60 to 80℃for 1 to 2 hours; more preferably at 60 deg.c for 2 hours.
The temperature reduction in step (3) is preferably to room temperature.
The room temperature is below 40 ℃; more preferably 30℃or lower.
The application method of the retention combination for paper comprises the following steps:
(4) Adding a flocculating agent into paper pulp in the papermaking step to defiberize;
(5) After shearing, adding inorganic particles;
(6) After stirring, a cationic polymer enhancer is added.
The fluffing time in the step (4) is preferably 30-90 seconds; more preferably 60 seconds.
The conditions of shearing described in step (5) are preferably shearing at a speed of 1000rpm for at least 30 seconds.
The stirring conditions in the step (6) are preferably a stirring speed of 300 to 500rpm for 1 minute or more.
Compared with the prior art, the invention has the following advantages and effects:
(1) The paper particle retention combination of the invention bonds anionic trash in pulp water, especially waste paper recycling and a closed water system by flocculation action by adopting flocculating agent with enough positive charge to form a large flocculation system network, after shearing and scattering in the subsequent process, fine silica sol particles are added, the scattered flocculation is pulled up under the action of positive and negative attraction, finally PVA molecules with moderate molecular weight and low cationic property are added, and the PVA molecules are stuck on electronegative particles and fibers, thereby improving the retention of pulp, reducing the turbidity of water, effectively enhancing the dry strength of paper, and particularly obviously improving the burst strength of finished paper.
(2) Because of the large hydraulic flushing force in the papermaking process, PVA is difficult to remain in the paper and is easy to run off, and in order to increase the bursting strength of the paper, the prior art generally solves the problem by means of surface treatment of the finished paper. The microparticle retention combination for paper can be added in the paper making process, so that the problem that PVA is difficult to retain in the paper making process is solved, and the paper with high bursting strength can be obtained by directly adding the microparticle retention combination into pulp.
Detailed Description
The present invention will be described in further detail with reference to examples, but embodiments of the present invention are not limited thereto. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art. The reagents and materials used in the present invention are commercially available unless otherwise specified.
Example 1
The following components are calculated according to parts by weight.
The cationic polymer enhancer was prepared by maintaining low speed agitation during the preparation, which was at a speed of 300rpm.
(1) 50 parts of PVA1788 is fully dissolved in water to obtain a polyvinyl alcohol aqueous solution with the mass percent concentration of 10 percent, and the polyvinyl alcohol aqueous solution is kept stand for degassing to obtain a degassed polyvinyl alcohol aqueous solution for standby.
(2) And (3) adding sodium hydroxide into the deaerated polyvinyl alcohol aqueous solution obtained in the step (1), and adjusting the pH of the mixture to pH=9.
(3) And (3) adding 0.5 part of cationic etherifying agent CTA (3-chloro-2-hydroxypropyl trimethyl ammonium chloride) or ETA (2, 3-epoxypropyl trimethyl ammonium chloride) into the mixture obtained in the step (2), reacting for 2 hours at 60 ℃, cooling to below 30 ℃, and discharging to obtain the cationic polymer reinforcing agent.
Paper samples were made using a paper retention combination by the following steps:
(4) In the papermaking step, adding 1% of aluminum sulfate relative to the dry weight of the paper pulp into a needle blade paddle plate, and defibering for 1 minute;
(5) After high-speed shearing (45 seconds at 1000 rpm), 0.5% silica sol (particle size 8nm, JN-20, buddha gel materials Co., ltd.) was added to the pulp dry weight;
(6) After stirring (stirring at 300-500 rpm for 90 seconds), 1% of the cationic polymer reinforcing agent obtained in step (3) relative to the dry weight of the pulp was added.
(7) After mixing well, 100GSM sheets were made, white water was taken to measure turbidity, and a paper sample of example 1 was obtained.
Example 2
The following components are calculated according to parts by weight.
The cationic polymer enhancer was prepared by maintaining low agitation during the preparation, at 500rpm.
(1) 50 parts of PVA1799 is fully dissolved in water to obtain a polyvinyl alcohol aqueous solution with the mass percent concentration of 10 percent, and the polyvinyl alcohol aqueous solution is kept stand for degassing to obtain a degassed polyvinyl alcohol aqueous solution for standby.
(2) And (3) adding sodium hydroxide into the deaerated polyvinyl alcohol aqueous solution obtained in the step (1), and adjusting the pH of the mixture to pH=10.
(3) And (3) adding 2.5 parts of cationic etherifying agent ETA (2, 3-epoxypropyl trimethyl ammonium chloride) into the mixture obtained in the step (2), reacting for 1 hour at 80 ℃, cooling to room temperature, and discharging to obtain the cationic polymer reinforcing agent.
Paper samples were made using a paper retention combination by the following steps:
(4) In the paper making step, 5% of aluminum sulfate relative to the dry weight of the paper pulp is added into the needle blade paddle plate to be fluffed for 1 minute;
(5) After high-speed shearing (1000 rpm shearing for 45 seconds), 0.3% silica sol (particle size 8 nm) was added relative to the dry weight of the pulp;
(6) After stirring (stirring at 300-500 rpm for 90 seconds), 0.8% of the cationic polymer reinforcing agent obtained in step (3) relative to the dry weight of the pulp was added.
(7) After mixing well, 100GSM sheets were made, white water was taken to measure turbidity, and a paper sample of example 2 was obtained.
Comparative example 1
A paper sample was prepared by the following steps:
after fluffing the needle blade pulp board, adding a cationic starch solution (the concentration is 2% by mass) which is 2% of the dry weight of the pulp as a dry strength agent, uniformly mixing, making a sheet according to 100GSM, taking white water to measure turbidity, and obtaining a paper sample of comparative example 1.
Comparative example 2
A paper sample was prepared by the following steps:
(1) In the papermaking step, a cationic starch solution (the concentration is 2% by mass) accounting for 1% of the dry weight of the pulp is added into a needle blade paddle plate, and the pulp is fluffed for 1 minute;
(2) After high-speed shearing (1000 rpm shearing for 45 seconds), 0.5% silica sol (particle size 8 nm) was added relative to the dry weight of the pulp;
(3) After mixing uniformly, 100GSM sheets were made, white water was taken to measure turbidity, and a paper sample of comparative example 2 was obtained.
Comparative example 3
A paper sample was prepared by the following steps:
(1) In the papermaking step, a cationic starch solution (the concentration is 2% by mass) accounting for 1% of the dry weight of the pulp is added into a needle blade paddle plate, and the pulp is fluffed for 1 minute;
(2) After high-speed shearing (1000 rpm shearing for 45 seconds), 0.5% silica sol (particle size 8 nm) was added relative to the dry weight of the pulp;
(3) After stirring (stirring at 300-500 rpm for 90 seconds), 0.5% of the cationic polymer reinforcing agent obtained in step (3) of example 1, relative to the dry weight of the pulp, was added.
(4) After mixing uniformly, 100GSM sheets were made, white water was taken to measure turbidity, and a paper sample of comparative example 3 was obtained.
Comparative example 4
A paper sample was prepared by the following steps:
after fluffing the needle blade pulp, adding a conventional binary commercial retention aid (Solenis according to the recommended amount of the product), uniformly mixing, making a sheet according to 100GSM, taking white water to measure turbidity, and obtaining a paper sample of comparative example 4.
Blank group
A paper sample was prepared by the following steps:
after fluffing the needle blade pulp board, uniformly mixing, making sheets according to 100GSM, taking white water to measure turbidity, and obtaining blank group paper samples.
The paper was tested for performance according to GB/T1539 and GB/T2679.5-2002, with the following results:
example 1, white water absorbance (turbidity) 0.108, burst index 1.9kpa.m 2 /g；
Example 2, white water absorbance (turbidity) 0.109, resistanceBreaking index 1.8kPa.m 2 /g；
Comparative example 1, white water absorbance (turbidity) 0.119, burst index 1.4kpa.m 2 /g；
Comparative example 2, white water absorbance (turbidity) 0.116, burst index 1.4kpa.m 2 /g；
Comparative example 3, white water absorbance (turbidity) 0.112, burst index 1.7kPa. M 2 /g
Comparative example 4, white water absorbance (turbidity) 0.106, burst index 1.5kPa. M 2 /g；
Blank, white water absorbance (turbidity) 0.068, burst index 0.9kpa.m 2 /g。
Analysis of test results for each example:
as can be seen from the blank group and the sample group control of each example, the paper particle retention combination used in the present invention can reduce the white water turbidity, improve the slurry retention, and improve the dry strength of the paper. As is clear from the comparison of the examples and the comparison of the sample group, the retention aid combination for paper of the present invention has more excellent effect of increasing the dry strength of paper at 2% of the amount of the conventional cationic starch dry strength agent; compared with the paper retention aid combination without the cationic polymer reinforcing agent, the paper retention aid combination with the cationic polymer reinforcing agent can further reduce the turbidity of white water and improve the dry strength of paper; compared with the conventional binary commercial retention aid, the white water turbidity is reduced, the retention of the slurry is improved, and the dry strength of the paper is also improved.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (6)
1. The application method of the retention aid combination for paper is characterized by comprising the following steps of:
(4) Adding a flocculating agent into paper pulp in the papermaking step to defiberize;
(5) After shearing, adding inorganic particles;
(6) After stirring, adding a cationic polymer reinforcing agent;
the retention aid combination for paper comprises the following components: flocculant, inorganic particulates, and cationic polymer reinforcement;
the flocculant is aluminum sulfate;
the inorganic particles are silica sol with electronegativity and the particle size of the silica sol is 8 nm;
the cationic polymer reinforcing agent is cationic polyvinyl alcohol;
the cationic polyvinyl alcohol is prepared by the following steps:
(1) Adding water into polyvinyl alcohol to dissolve the polyvinyl alcohol to obtain a polyvinyl alcohol aqueous solution; degassing to obtain a degassed polyvinyl alcohol aqueous solution;
(2) Adding a pH regulator into the deaerated polyvinyl alcohol aqueous solution obtained in the step (1) to regulate the pH value of the mixture;
(3) Adding a cationic etherifying agent into the mixture obtained in the step (2), reacting, and cooling and discharging to obtain cationic polyvinyl alcohol;
the polyvinyl alcohol in the step (1) is PVA1788 or PVA1799;
the cationic etherifying agent in the step (3) is 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride or 2, 3-epoxypropyl trimethyl ammonium chloride;
the mass ratio of the flocculant to the inorganic particles to the cationic polymer reinforcing agent is (1-5) to (0.2-1) to (0.5-1) based on the mass of the solid.
2. The method of using a retention aid composition for paper according to claim 1, wherein:
the mass ratio of the flocculant to the inorganic particles to the cationic polymer reinforcing agent is (1-5) to (0.5-1) based on the mass of the solid.
3. The method of using a retention aid composition for paper according to claim 1, wherein:
the pH regulator in the step (2) is weak acid strong alkali salt or metal hydroxide;
the pH value of the adjusting mixture in the step (2) is adjusted to 9-10;
the addition amount of the cationic etherifying agent in the step (3) is 1-5% relative to the dry weight of the polyvinyl alcohol.
4. A method of using a retention aid composition for paper according to claim 3, wherein:
the pH regulator in the step (2) is sodium hydroxide;
the pH value of the adjusting mixture in the step (2) is adjusted to 9.
5. The method of using a retention aid composition for paper according to claim 1, wherein:
the step (1), the step (2) and the step (3) are carried out under stirring conditions;
the stirring speed is 300-500 rpm;
the degassing in the step (1) is standing degassing or vacuumizing degassing;
the reaction conditions in the step (3) are that the reaction is carried out for 1 to 2 hours at a temperature of between 60 and 80 ℃.
6. The method of using a retention aid composition for paper according to claim 1, wherein:
the fluffing time in the step (4) is 30-90 seconds;
the shearing conditions in step (5) are shearing at a speed of 1000rpm for at least 30 seconds;
the stirring conditions in the step (6) are a rotation speed of 300-500 rpm and stirring is carried out for more than 1 minute.
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