CN114855498A - Paper retention aid combination and use method thereof - Google Patents
Paper retention aid combination and use method thereof Download PDFInfo
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- CN114855498A CN114855498A CN202210402775.6A CN202210402775A CN114855498A CN 114855498 A CN114855498 A CN 114855498A CN 202210402775 A CN202210402775 A CN 202210402775A CN 114855498 A CN114855498 A CN 114855498A
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- polyvinyl alcohol
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- 230000014759 maintenance of location Effects 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title abstract description 16
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 34
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 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
- 239000000203 mixture Substances 0.000 claims abstract description 17
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 17
- 239000007864 aqueous solution Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 238000010008 shearing Methods 0.000 claims abstract description 11
- 239000008394 flocculating agent Substances 0.000 claims abstract description 10
- 238000007872 degassing Methods 0.000 claims abstract description 9
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000003623 enhancer Substances 0.000 claims abstract description 3
- 239000011859 microparticle Substances 0.000 claims abstract description 3
- 238000003756 stirring Methods 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 229920001131 Pulp (paper) Polymers 0.000 claims description 7
- 239000010954 inorganic particle Substances 0.000 claims description 6
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [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 5
- 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
- 238000001816 cooling Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 4
- 239000007787 solid Substances 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
- 229920001661 Chitosan Polymers 0.000 claims description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 229940037003 alum Drugs 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
- 238000009849 vacuum degassing Methods 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
- 230000009471 action Effects 0.000 abstract description 4
- 230000009172 bursting Effects 0.000 abstract description 4
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 239000010813 municipal solid waste Substances 0.000 abstract description 2
- 150000001450 anions Chemical class 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 12
- 238000002835 absorbance Methods 0.000 description 7
- 229920002472 Starch Polymers 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 239000000243 solution Substances 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
- 239000000126 substance Substances 0.000 description 4
- 239000010893 paper waste 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
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000010419 fine particle Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 125000000129 anionic group Chemical group 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 244000144992 flock Species 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
- 238000011056 performance test Methods 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
- 239000011122 softwood Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000012360 testing method 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 using method thereof. The retention aid composition for paper comprises a flocculant, inorganic microparticles and a cationic polymer enhancer. The cationic polymer reinforcing agent is prepared by degassing a polyvinyl alcohol aqueous solution, adjusting the pH value, and adding a cationic etherifying agent for reaction. According to the retention aid combination for the paper, the flocculating agent with enough positive charges is adopted, anion garbage is bonded through the action of flocs to form a large flocculation system network, fine silica sol particles are added after shearing and scattering of a subsequent process, the scattered flocs are drawn close under the action of positive and negative attraction, and finally PVA molecules with moderate molecular weight and low cationic property are added and are adhered to negative particles and fibers, so that the retention of pulp is improved, the turbidity of water is reduced, the dry strength of the paper is effectively enhanced, and particularly, the bursting strength of the finished paper is obviously improved. The paper particle retention aid composition can be added in the papermaking process, so that the problem that PVA is difficult to retain in the papermaking 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 using method thereof.
Background
The papermaking raw materials mainly comprise waste paper, and the recycling of the waste paper brings many impurities, such as starch, filler, sticky matters and the like for paper, which affect the operation of a paper machine and the quality of finished paper. In addition, the discharge amount of wastewater in the paper making industry is large, the wastewater is sealed and recycled, a large amount of negative-charged fine fibers and chemical medicines are accumulated in water, and the using effects of conventional chemicals and retention and drainage aids are seriously interfered. How to improve the retention rate in the papermaking process, reduce the solid content in the wastewater, save materials, save cost and improve the quality of paper products is an important subject of the wet end of papermaking.
The conventional retention and drainage aid for the wet part of papermaking is a high molecular substance with positive charge and helps retention through charge patches and bridging. The unitary retention is easy to form large floccules, the binary retention and the particle retention overcome the defects of the large floccules, the water filtration speed and the paper quality are improved, particularly, the particle retention is realized by firstly adding the cationic polymer, forming the large floccules by fibers, adding particles with fine particles, large surface area and obvious electronegativity at the part close to a paper machine through shearing and scattering of the subsequent process to form fine floccules, thereby not only helping the retention of fine fibers, fillers and various chemicals, but also having excellent paper formation uniformity. However, the large flocks formed in the early stage of the particulate retention are broken up and the strength of the paper is affected. How to utilize the advantages of particle retention without reducing the enhancement of macromolecules is a technical problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a retention aid combination for paper.
It is a further object of the present invention to provide a method of using the retention aid composition for paper.
The purpose of the invention is realized by the following technical scheme:
a retention aid combination for paper comprising the following components: flocculants, inorganic microparticles and cationic polymer reinforcing agents.
Preferably, the flocculant, the inorganic particles and the cationic polymer reinforcing agent are used in a mass ratio of (1-5) to (0.2-1) to (0.5-1) in terms of solid mass, more preferably in a mass ratio of (1-5) to (0.3-0.5) to (0.8-1), and most preferably in a mass ratio of 1:0.5: 1.
The flocculating agent is preferably at least one of water treatment agents with flocculation effect, such as chitosan, aluminum sulfate, alum, polyaluminium chloride and the like.
The inorganic fine particles are preferably negatively charged silica sol having an extremely small particle size, and more preferably silica sol having a particle size of 8 nm.
The cationic polymer reinforcing agent is preferably cationic polyvinyl alcohol.
The cationic polyvinyl alcohol is prepared by the following steps:
(1) dissolving polyvinyl alcohol (PVA) in water to obtain a polyvinyl alcohol aqueous solution; degassing to obtain a degassed polyvinyl alcohol aqueous solution;
(2) adding a pH regulator into the degassed 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 step (1), the step (2) and the step (3) are carried out under stirring conditions; more preferably, the stirring speed is 300-500 rpm.
The polyvinyl alcohol used in step (1) is preferably PVA1788 or PVA 1799.
The concentration of the polyvinyl alcohol aqueous solution in the step (1) is preferably 10% by mass.
The degassing in the step (1) is standing degassing or vacuum degassing.
The pH regulator in step (2) is preferably a weak acid strong base salt or a metal hydroxide, more preferably sodium hydroxide.
The pH value under the condition in the step (2) is preferably adjusted to 9-10, and is more preferably adjusted to 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 condition in the step (3) is preferably reaction at 60-80 ℃ for 1-2 hours; more preferably at 60 ℃ for 2 hours.
The temperature reduction in the step (3) is preferably to room temperature.
The room temperature is below 40 ℃; more preferably 30 ℃ or lower.
The use method of the retention aid combination for paper comprises the following steps:
(4) adding a flocculating agent into the paper pulp in the papermaking step, and defibering;
(5) after shearing, adding inorganic particles;
(6) after stirring, the cationic polymer enhancer is added.
The time for untwining in the step (4) is preferably 30-90 seconds; more preferably 60 seconds.
The shearing conditions in the step (5) are preferably such that the shearing is carried out at a rotational speed of 1000rpm for at least 30 seconds.
The stirring condition in the step (6) is preferably that the stirring is carried out at a rotating speed of 300-500 rpm for more than 1 minute.
Compared with the prior art, the invention has the following advantages and effects:
(1) the paper particle retention aid composition adopts the flocculating agent with enough positive charges to bond anionic garbage in pulp water, particularly in a waste paper recycling and closed water system through the action of flocs to form a large flocculation system network, fine silica sol particles are added after shearing and scattering of a subsequent process, the scattered flocs are drawn close under the action of positive and negative attraction, and finally PVA molecules with moderate molecular weight and low cationic property are added and are adhered to negatively charged particles and fibers, so that the retention of pulp is improved, the turbidity of water is reduced, the dry strength of paper is effectively enhanced, and particularly the bursting strength of finished paper is obviously improved.
(2) Since the water flushing force in the papermaking process is large, 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 on the finished paper. The paper particle retention aid composition can be added in the papermaking process, so that the problem that PVA is difficult to retain in the papermaking process is solved, and the paper with high bursting strength can be obtained by directly adding the paper particle retention aid composition into pulp.
Detailed Description
The present invention will be described in further detail with reference to examples, but the embodiments of the present invention are not limited thereto. Reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated. Unless otherwise indicated, reagents and materials used in the present invention are commercially available.
Example 1
The following components are calculated according to parts by mass.
The cationic polymer reinforcing agent was prepared by maintaining low-speed stirring during the preparation, the speed of the low-speed stirring being 300 rpm.
(1) Fully dissolving 50 parts of PVA1788 in water to obtain a polyvinyl alcohol aqueous solution with the mass percentage concentration of 10%, standing and degassing to obtain a degassed polyvinyl alcohol aqueous solution for later use.
(2) Sodium hydroxide was added to the degassed aqueous polyvinyl alcohol solution obtained in step (1), and the pH of the mixture was adjusted to 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 at 60 ℃ for 2 hours, cooling to below 30 ℃, and discharging to obtain the cationic polymer reinforcing agent.
A paper sample was made using a paper retention aid combination by:
(4) adding aluminum sulfate accounting for 1 percent of the dry weight of the paper pulp into a needle blade paddle board in the papermaking step, and defibering for 1 minute;
(5) after high-speed shearing (shearing at 1000rpm for 45 seconds), 0.5% silica sol (particle size 8nm, Foshan Corp Seisakusho New Material Co., Ltd., JN-20) was added to the pulp dry weight;
(6) and (3) after stirring (stirring at 300-500 rpm for 90 seconds), adding 1% of the cationic polymer reinforcing agent obtained in the step (3) relative to the dry weight of the pulp.
(7) After mixing, sheets were formed according to 100GSM, and the white water was taken to measure turbidity, and a sample of the paper of example 1 was obtained.
Example 2
The following components are calculated according to parts by mass.
The cationic polymer reinforcing agent was prepared by maintaining low-speed stirring during the preparation, the speed of the low-speed stirring being 500 rpm.
(1) And (3) fully dissolving 50 parts of PVA1799 in water to obtain a polyvinyl alcohol aqueous solution with the mass percentage concentration of 10%, standing and degassing to obtain a degassed polyvinyl alcohol aqueous solution for later use.
(2) Sodium hydroxide was added to the degassed aqueous polyvinyl alcohol solution obtained in step (1), and the pH of the mixture was adjusted to 10.
(3) And (3) adding 2.5 parts of cationic etherifying agent ETA (2, 3-epoxypropyltrimethylammonium 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.
A paper sample was made using a paper retention aid combination by:
(4) adding 5% of aluminum sulfate relative to the dry weight of the paper pulp into a needle blade paddle board in the papermaking step, and defibering for 1 minute;
(5) after high shear (45 seconds at 1000 rpm), 0.3% silica sol (particle size 8nm) relative to the dry weight of the pulp was added;
(6) and (3) after stirring (stirring at 300-500 rpm for 90 seconds), adding 0.8% of the cationic polymer reinforcing agent obtained in the step (3) relative to the dry weight of the pulp.
(7) After mixing, sheets were formed according to 100GSM, and the white water was taken to measure turbidity, and a sample of the paper of example 2 was obtained.
Comparative example 1
A paper sample was made by the following steps:
after the needle blade pulp board is defibered, cationic starch solution (the concentration is 2 percent by mass) which is 2 percent of the dry weight of the paper pulp is added as dry strength agent, after uniform mixing, the paper is made into sheets according to 100GSM, white water is taken for measuring turbidity, and the paper sample of the comparative example 1 is obtained.
Comparative example 2
A paper sample was made by the following steps:
(1) adding a needle blade paddle board into a cationic starch solution (the concentration is 2 percent by mass) which is 1 percent of the dry weight of the paper pulp in the papermaking step, and defibering for 1 minute;
(2) after high shear (45 seconds at 1000 rpm), 0.5% silica sol (particle size 8nm) relative to the dry weight of the pulp was added;
(3) after mixing uniformly, sheets were formed according to 100GSM, and white water was taken to measure turbidity, and a paper sample of comparative example 2 was obtained.
Comparative example 3
A paper sample was made by the following steps:
(1) adding a needle blade paddle board into a cationic starch solution (the concentration is 2 percent by mass) which is 1 percent of the dry weight of the paper pulp in the papermaking step, and defibering for 1 minute;
(2) after high shear (45 seconds at 1000 rpm), 0.5% silica sol (particle size 8nm) relative to the dry weight of the pulp was added;
(3) after stirring (300 to 500rpm for 90 seconds), 0.5% by dry weight of the cationic polymer reinforcing agent obtained in step (3) of example 1 was added.
(4) After mixing uniformly, sheets were formed according to 100GSM, and white water was taken to measure turbidity, and a paper sample of comparative example 3 was obtained.
Comparative example 4
A paper sample was made by the following steps:
after the softwood pulp sheets were fluffed, conventional binary commercial retention aids (Solenis, recommended amount of product) were added, mixed well and sheeted according to 100GSM, white water was taken for turbidity measurement, and a paper sample of comparative example 4 was obtained.
Blank group
A paper sample was made by the following steps:
after the needle blade pulp board is defibered, the mixture is evenly mixed and then is processed into sheets according to 100GSM, white water is taken for turbidity measurement, and a blank group of paper samples are obtained.
The paper is subjected to performance tests according to GB/T1539 and GB/T2679.5-2002, and the results are as follows:
example 1 white Water Absorbance (turbidity) 0.108, burst index 1.9kPa. m 2 /g；
Example 2 white Water Absorbance (turbidity) 0.109 and burst 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, absorbance (turbidity) of white water 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 group, white Water Absorbance (turbidity) 0.068, burst index 0.9kPa.m 2 /g。
Analysis of test results for each example:
as is clear from the comparison between the blank and sample groups in each example, the particulate retention aid for paper used in the present invention can reduce white water turbidity, improve retention of pulp, and improve dry strength of paper. Compared with the common cationic starch dry strength agent, the retention aid composition for paper has more excellent effect of increasing the dry strength of paper under the condition of 2 percent of dosage; compared with the retention combination for paper without using the cationic polymer reinforcing agent, the retention combination for paper using the cationic polymer reinforcing agent can further reduce the turbidity of white water and improve the dry strength of the paper; compared with the conventional binary commercial retention aid, the turbidity of white water is reduced, the retention of the pulp is improved, and the dry strength of paper is also improved.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A retention aid composition for paper comprising the following components: flocculants, inorganic microparticles and cationic polymer reinforcing agents.
2. A retention aid combination for paper according to claim 1, characterized in that:
the mass ratio of the flocculating agent to the inorganic particles to the cationic polymer reinforcing agent is (1-5) to (0.2-1) to (0.5-1) calculated according to the solid mass.
3. A retention aid combination for paper according to claim 2, characterized in that:
the mass ratio of the flocculating agent, the inorganic particles and the cationic polymer reinforcing agent is (1-5): (0.3-0.5): (0.8-1) calculated according to the solid mass.
4. A retention aid combination for paper according to claim 1, characterized in that:
the flocculating agent is at least one of chitosan, aluminum sulfate, alum and polyaluminium chloride;
the inorganic particles are silica sol with negative charge and extremely small particle size;
the cationic polymer reinforcing agent is cationic polyvinyl alcohol.
5. A retention aid combination for paper according to claim 4, characterized in that:
the cationic polyvinyl alcohol is prepared by the following steps:
(1) dissolving polyvinyl alcohol in water to obtain a polyvinyl alcohol aqueous solution; degassing to obtain a degassed polyvinyl alcohol aqueous solution;
(2) adding a pH regulator into the degassed 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.
6. A retention aid combination for paper according to claim 5, characterized in that:
the polyvinyl alcohol in the step (1) is PVA1788 or PVA 1799;
the pH regulator in the step (2) is weak acid strong alkali salt or metal hydroxide;
the pH value of the condition in the step (2) is adjusted to 9-10;
the cationic etherifying agent in the step (3) is 3-chloro-2-hydroxypropyl-trimethyl ammonium chloride or 2, 3-epoxypropyltrimethyl ammonium chloride;
the addition amount of the cationic etherifying agent in the step (3) is 1-5% of the dry weight of the polyvinyl alcohol.
7. A retention aid combination for paper according to claim 6, characterized in that:
the pH regulator in the step (2) is sodium hydroxide;
the condition described in step (2) is to adjust the pH to 9.
8. A retention aid combination for paper according to claim 5, characterized in that:
the step (1), the step (2) and the step (3) are carried out under the condition of stirring;
the stirring speed is 300-500 rpm;
the degassing in the step (1) is standing degassing or vacuum degassing;
the reaction condition in the step (3) is that the reaction is carried out for 1-2 hours at the temperature of 60-80 ℃.
9. Use of a paper retention aid combination according to any of claims 1 to 8, characterized in that it comprises the following steps:
(4) adding a flocculating agent into the paper pulp in the papermaking step, and defibering;
(5) after shearing, adding inorganic particles;
(6) after stirring, the cationic polymer enhancer is added.
10. Use of a paper retention aid combination according to claim 9, characterized in that:
the time for untwining in the step (4) is 30-90 seconds;
the shearing condition in the step (5) is that the rotating speed of 1000rpm is used for shearing for at least 30 seconds;
the stirring condition in the step (6) is that the stirring is carried out for more than 1 minute at the rotating speed of 300-500 rpm.
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