CN1294227A - Paper reinforcing agent and paper reinforcing method - Google Patents
Paper reinforcing agent and paper reinforcing method Download PDFInfo
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- CN1294227A CN1294227A CN 99126332 CN99126332A CN1294227A CN 1294227 A CN1294227 A CN 1294227A CN 99126332 CN99126332 CN 99126332 CN 99126332 A CN99126332 A CN 99126332A CN 1294227 A CN1294227 A CN 1294227A
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Abstract
A paper-strengthening agent contains a polymer disperser, which is prepared through polymerizing the monomers containing (methyl) acrylic acid in aqueous solution and depositing the polymer in fine particles form. It is applied through diluting with water, coating it on paper or immersing paper in it, and drying.
Description
The present invention relates to a kind of paper strengthening agent, the dispersion that wherein contains a kind of insoluble polymer fine particle, described polymer fine particle dispersion be with containing in the aqueous solution (methyl) acrylic acid monomer polymerization and products therefrom precipitated and, this dispersion is added in paper-making process on the ply of paper of formation.The invention still further relates to a kind of paper Enhancement Method, comprising being impregnated into paper by the method for spraying or coat by the low viscosity polymer dispersion of paper strengthening agent dilute with water gained of the present invention.
Japanese Laid-Open Patent Application Sho62-20511 disclosed a kind of electrolytical in the presence of by with monomer in a kind of dissolved monomer but do not dissolve polymerization in the aqueous solution of salt of polymer of generation, thereby obtain the method for water soluble polymer dispersions.
On the other hand, disclosed Japanese patent application Sho60-185900 has disclosed in a kind of aqueous solution of salt of the polymer by acrylic acid and acrylamide not being dissolved generation a kind of dissolved monomer and has carried out the method that polymerization obtains polymer fine particle dispersion.In the method, this fine particle can obtain under the situation that does not have any polymer dielectric.Polymer fine particle in this acquisition is water-insoluble, and can be by dissolution with solvents when this dispersion is neutralized.That is to say that this is a kind of and different technology described in the Japanese patent application Sho62-20511.Yet during storage, the fine particle in the acrylic acid-acrylamide copolymer dispersion can agglomeration form the same curdled milk of bean curd, therefore has the defective that can not preserve for a long time.
One object of the present invention is to improve the paper bursting strength, and ring crush intensity and paper surface strength for example utilize heavy polymer to permeate the paper tape waxing effectively.
Inventor of the present invention finds, trickle polymeric dispersions with low viscosity, excellent machinability and outstanding storage stability can be by containing (methyl) acrylic acid monomer by polymerization under the dispersed retention agents condition that for example the cationic polymer electrolyte exists, and the method for the polymer that generates of precipitation and preparing.In addition, in the various trials that this dispersion of research is used, inventor of the present invention also finds, described dispersion has significant effect, for example described dispersion is covered the paper that is produced on the dried paper and strengthen effect and described dispersion is sprayed the paper enhancing effect that is produced on the immersion wet end l Water Paper, make that thus the present invention is accomplished with size presser, braking club formula coating machine or blade coating machine etc.
First aspect present invention provides a kind of paper strengthening agent that contains a kind of polymeric dispersions in fact, described polymeric dispersions is by (methyl) acrylic acid monomer and prepare with the polymer that fine particulate form precipitation is generated containing in the polywater solution, and this paper strengthening agent is added on the paper of formation, wherein
(1) (methyl) acrylic acid (being total to) polymers concentration in the polymeric dispersions is at least 5% (weight),
(2) (methyl) acrylic acid (being total to) polymers average grain diameter in the polymeric dispersions is 1-100 μ m,
(3) viscosity that has just made and made the polymeric dispersions after month is 30-5000mpa.s,
(4) after polymeric dispersions is distilled 10 times of water dilutions, when being 400 microscopic examination dilute dispersion, can observe polymer particle with amplification coefficient, and
(5) during the pH regulator to 7.0 of the dispersion after will diluting with alkali, described polymer particle dissolving forms the aqueous solution.
A second aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, in the above-mentioned paper strengthening agent of mentioning, polymeric dispersions is to be aggregated under the condition that dispersed retention agents (containing the multivalence electrolyte) exists and to precipitate.
A third aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, in paper strengthening agent mentioned above, dispersed retention agents is a kind of surfactant that is selected from the cationic polymer electrolyte, has a polyvalent cation hydrophilic radical and a hydrophobic grouping, and composition thereof.
A fourth aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, the weight ratio that in paper strengthening agent mentioned above, contains (methyl) acrylic acid monomer and described dispersed retention agents in the aqueous solution is 100: 1-10: 1.
A fifth aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, in paper strengthening agent mentioned above, the described polymeric dispersions viscosity that has just made or made after one month is 30-1500mpa.s.
A sixth aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, in paper strengthening agent mentioned above, dispersed retention agents is dimethyl diallyl ammonium chloride (a being total to) polymers.
A seventh aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, in paper strengthening agent mentioned above, dispersed retention agents is a polyethylenepolyamine that a kind of alkyl replaces and/or that aralkyl replaces.
A eighth aspect of the present invention provides a kind of paper strengthening agent, it is characterized in that, in paper strengthening agent mentioned above, dispersed retention agents is a kind of alkyl group with at least 5 carbon atoms penten that replace and/or that aralkyl replaces.
A ninth aspect of the present invention provides a kind of paper Enhancement Method that comprises following steps: the above-mentioned paper strengthening agent of dilute with water apply or the impregnation drying paper with described dilute dispersion, and the dried paper that will handle carries out drying with the preparation dilute dispersion.
A tenth aspect of the present invention provides a kind of paper Enhancement Method, wherein makes the dilute dispersion of above-mentioned paper strengthening agent immerse wet web.
A eleventh aspect of the present invention provides a kind of paper Enhancement Method, and wherein the dilute dispersion with above-mentioned paper strengthening agent is sprayed onto on the wet web.
A twelveth aspect of the present invention provides a kind of paper Enhancement Method, and wherein the wet web in the said method is an individual layer.
(methyl) the acrylic acid monomer that contains of Shi Yonging is a kind of 5-50% of containing (mole) acrylic acid, methacrylic acid and composition thereof in the present invention, with the mixture of itaconic acid and/or acrylamido isobutyl group sulfonic acid, its scope is not to reduce the degree of polymerization and not have adverse effect to be as the criterion to solubility; And 50-95% (mole) a kind of is selected from following non-ionic monomer: (methyl) acrylamide, (methyl) acrylonitrile, N-vinyl carboxylic acid acid amides, N-isopropyl (methyl) acrylamide, N, N-dimethyl (methyl) acrylamide, (methyl) methyl acrylate, (methyl) hydroxy-ethyl acrylate, vinyl methyl ether, vinyl acetate, styrene and composition thereof.
Cationic monomer can be used as the composition polymerization in addition that contains (methyl) acrylic monomers, and its consumption should guarantee that when with distilled water resulting polymers being diluted polymer still keeps the water indissolubility.
Wherein, contain 5-50% (mole) (methyl) acrylic acid, the monomer component of 50-95% (mole) (methyl) acrylamide and 0-50% (mole) (methyl) acrylonitrile is the most preferred.
Preferably under the situation that dispersed retention agents exists, implement polymerisation, to obtain polymeric dispersions of the present invention.Being used for the example of the electrolytical dispersed retention agents of cationic polymer that comprises of the present invention is: the salt of (being total to) polymer of the salt of dialkyl aminoalkyl methacrylate or quaternary ammonium product, dialkyl aminoalkyl (methyl) acrylamide or (being total to) polymer of quaternary ammonium product, and (being total to) polymer of dialkyldiallyl ammonium salt.
The salt of dialkyl aminoalkyl (methyl) acrylate or the example of quaternary ammonium product comprise dimethylaminoethyl (methyl) acrylate hydrochloride and acrylyl oxy-ethyl-trimethyl salmiac.The salt of dialkyl aminoalkyl (methyl) acrylamide or quaternary ammonium product comprise the hydrochloride or the methylate of dialkyl amido propyl group (methyl) acrylamide.The example of dialkyldiallyl ammonium salt is a dimethyl diallyl ammonium chloride.
Be not only single type, the mixture of the cationic monomer that can form described water-soluble polymer that two or more are above-mentioned also can be used.
This cationic water-soluble polymer can be homopolymers or with the non-ionic monomer copolymer of acrylamide for example.
Particularly the preferred cation water solubility copolymer is dimethyl diallyl ammonium chloride (a being total to) polymers.
Be used for the polyethylenepolyamine of example for replacing that comprises the dispersed retention agents of the surfactant with polyvalent cation hydrophilic radical and hydrophobic grouping of the present invention, wherein at least one hydrogen atom on its nitrogen-atoms is replaced by alkyl group and/or aromatic alkyl group.The alkyl group substitution product that has the penten of at least 5 carbon atoms in described alkyl group is effective.
The weight ratio preferred 100 that contains (methyl) acrylic acid monomer and dispersed retention agents: 1-10: 1.If the consumption of dispersed retention agents is too small, dispersion forms bean curd-like curdled milk.On the other hand, the dispersed retention agents of excessive interpolation does not then have any economic implications.
Dispersed retention agents according to the present invention can be the unification compound, also can be its mixture.
The result who adds dispersed retention agents in above-mentioned scope is that the viscosity of polymeric dispersions maintains after just making and making one month in the 30-5000mpa.s scope, and keeps stable in long-term.
Product with 30-1500mpa.s viscosity is easy to use preferred because of it.
Owing to use polyvalent cation as dispersed retention agents according to polymeric dispersions of the present invention, therefore, the surface charge of polymer beads is considered to cationic, and this polymer beads also can mix mutually with the water-soluble cationic polymer aqueous solution and aqueous dispersion.
With regard to promoting polymer precipitation, the aqueous solution of salt also can use in the present invention.The example that forms the salt of this saline solution comprises alkali metal salt, sodium salt for example, sylvite, and ammonium salt for example ammonium chloride, ammonium sulfate and ammonium nitrate.The concentration of above-mentioned saline solution and pH must be able to make and contain (methyl) acrylic acid monomer dissolving, and formed polymer is insoluble.On the contrary, the dispersed retention agents that also exists in addition must be dissolved in above-mentioned saline solution.
(methyl) acrylic acid (being total to) polymers dispersion among the present invention and dispersed retention agents can be respectively by being dissolved in monomer in the aqueous medium under the nitrogen atmosphere of anaerobic, and by adding water-soluble azo type initiators for polymerization for example 2,2-azo two (2 amidine propane) hydrochloride or water soluble oxidized reduced form polymerization initiator (for example using ammonium persulfate and sodium hydrogensulfite) carry out radical polymerization and obtain.
The temperature of polymerization system according to the character of employed polymerization initiator, is selected arbitrarily in 0-100 ℃ of scope respectively.The molecular weight of the polymer that obtains in order to regulate, mode that can be identical with common radical polymerization is added and is used such as isopropyl alcohol or the such chain-transferring agent of mercaptan by suitable selection.When preparation (methyl) acrylic acid (being total to) polymers dispersion, in order successfully to precipitate tiny polymer beads, must stir with the speed that the agitator peripheral speed is at least 1m/min.The mixing speed no maximum, and any stirring condition of inclusions escape that do not make all can be selected for use.Although the preparation of dispersed retention agents is implemented by the static polymerization in the aqueous solution usually, from the angle of product homogenizing, polymerization process of the present invention is preferably carried out under stirring condition.
Polymer concentration is higher or be at least 5% (weight) in the dispersion of the present invention, is generally about 5-40% (weight).
Although dispersion of the present invention contains the formed polymer of high concentration, because polymer is scattered in the decentralized medium with fine particle in stable conditionly, the viscosity of this dispersion is but very low, is low to moderate 30-5000mpa.s usually, preferred 30-1500mpa.s.Therefore, as its feature, polymeric dispersions can easily flow and can carry out processed easily.
Polymer dispersion particle of the present invention can be identified under 400 times of light microscopes at undiluted state or with behind 10 times of the distilled water dilutings.At this moment, the average particulate diameter of polymer particle is generally 1-100 μ m, preferred 2-50 μ m, particularly preferred 2-30 μ m.When the average particulate diameter of polymer particle surpasses 100 μ m, because particle is easy to precipitation, storage stability will descend.In addition, if the size of polymer particle is bigger, in use, even when just mixing with water, dissolubility also will descend, therefore need for a long time next complete dissolve polymer.On the contrary, dispersion of the present invention has outstanding storage stability, even and if also can not take place such as particle problem adhered to one another when preserving at normal temperatures.In addition, the solubility in water is fairly good during use.
Polymer molecular weight in the dispersion of the present invention there is no particular restriction.If dispersion of the present invention is explained with solution viscosity, when in the ammonium sulfate aqueous solution that is dissolved in 2% (weight) (viscosity at 25 ℃ time use Brookfield viscometer determining) so, in the method, when polymer concentration was 0.5% (weight), viscosity was usually in the 5-200mpa.s scope.And, dispersion of the present invention even after preserving month, its viscosity is almost without any variation.
After diluted 10 times of dispersion of the present invention, can discern polymer particle with microscope, and when a kind of alkali was added into dispersion with dispersion pH regulator to 7.0, this polymer particle dissolving formed the aqueous solution.That is, dispersion of the present invention is a kind of dispersion of insoluble polymer fine particle.
In the present invention, paper strengthens effect and can apply or be sprayed onto dry paper or moistening paper surface and dry the acquisition by the aqueous dispersion with the dilution of described paper strengthening agent.
In paper Enhancement Method of the present invention, paper strengthening agent can be used in combination with other wet end chemistry agent, for example is used for the retention agent or the chemical conditioner of filler.In particular, a kind of cationic starch aqueous solution, cationic polyacrylamide or other wet end paper strengthening agents etc. are added into or mix mutually with paper making raw material, and will be sprayed to according to the aqueous dispersion of the dilution of paper strengthening agent of the present invention on the l Water Paper in interstage that utilizes papermaking wire-cloth to form page, promptly before the vacuum dehydration part or on this part, so that the aqueous dispersion of described dilution is immersed in the paper.
According to another embodiment of the present invention, behind the paper dryer that will make, use size presser, roll coater or knife type coater etc. are coated to the dilution water dispersion of paper strengthening agent of the present invention on the gained dry paper, and make polymer be immersed in paper surface or paper inside.
According to said method, the polymer of the almost entire quantity that is coated with all is retained in the paper, promptly hangs in the page.Because the cementations of paper pulp fiber etc. not only can increase the surface strength of paper, but also can increase the bursting strength and the ring crush intensity of paper.
The paper that non-wet end adds paper strengthening agent is through being usually used in printing, and paper used for recording and PPC are with paper (that is, plain copying paper), and paper is generally individual layer.
In addition, for example starch, modified starch, casein and galactomannans also can additionally be used in the paper strengthening agent of the present invention traditional paper strengthening agent.
The invention is characterized in, do not use and contain the polymer that comprises (methyl) acrylic acid water-soluble monomer.
(methyl) acrylic acid (being total to) polymers is fire-resistant, even and if molecular weight very high, still have than low-viscosity, this makes the dilution water dispersion of high concentration easily to be applied on the surface.
According to the present invention, heavy polymer can effectively be coated with at the water-insoluble state.Because pH will rise when coated polymeric immerses paper, a part of polymer becomes water-soluble and is converted into pasty mass.Thereby can be contemplated that it will play binder.
When considering the characteristic of its smears, comparing with starch does not have corruption to take place, and with the aqueous solution of (methyl) acrylate (being total to) polymers mutually specific viscosity do not increase.Therefore, when spraying to the smears on the l Water Paper, have no problem, and the phenomenon of dry paper face coat inequality can not take place.
In the method for the invention, polymeric dispersions is sprayed or is applied on the paper surface after polymer concentration being diluted to 0.1-0.5% (weight).
The clean amount that sprays or be applied to the polymer on paper surface is the 0.05-1.0% (weight) of paper pulp SS (being suspended solid), preferred 0.1-0.5% (weight).
Embodiment
Following embodiment is to the invention provides detailed explanation, but the present invention is not limited to this.Preparation embodiment-1
Be equipped with in the reactor of agitator, nitrogen breather pipe and temperature controller one, with 10 parts of monomer compositions of forming by the monomer of 15% (mole) acrylic acid, 55% (mole) acrylamide and 30% (mole) acrylonitrile, and a PDDA as dispersant (CPS company makes, and commodity are called Age Flock WT40HV) is dissolved in 89 parts of deionized waters.After this, add 2,2 '-azo two [2-(amidine azoles quinoline-2-yl) propane dihydrochloride (WakoPure Chemical Industries Co., Ltd makes, and commodity are called VA-044) as polymerization initiator.Under stirring state, polymerisation is carried out 20 hours to generate polymeric dispersions (pH3), the fine particle of the 5-50 μ m that wherein is scattered here and there under 35 ℃ of temperature.This dispersion is called as " sample-1 ".
The viscosity of above-mentioned polymeric dispersions (sample-1) is 1000mpa.s, fine particle even still can discerned by microscope with behind 10 times of the distilled water dilutings, and this polymer is proved to be water-insoluble on substantially.Aqueous sodium carbonate is mixed mutually with above-mentioned dispersion, regulate dispersion pH to 7, after this polymer is dissolved, and its molecular weight is measured by the inherent viscosity based on the above-mentioned aqueous solution.Preparation embodiment-2
Except using the monomer composition of forming by 30% (mole) acrylic acid, 45% (mole) acrylamide and 25% (mole) acrylonitrile to obtain to repeat to prepare the method for embodiment-1 the insoluble polymer dispersion.This dispersion is called as " sample-2 ".Preparation embodiment-3
Be equipped with in the reactor of agitator, nitrogen gas tube and temperature controller one, it is in the sodium-chloride water solution of 20% (weight) that 20 parts of monomer compositions of being made up of 30% (mole) acrylic acid, 60% (mole) acrylamide and 10% (mole) acrylonitrile and 1 part of PDDA as dispersant (CPS company makes, and commodity are called Age Flock WT40HV) are dissolved in 79 parts of concentration.After this,, add 2,2 '-azo two (2-amidine propane) dihydrochloride (Wako Pure Chemical Industries Co., Ltd makes, and commodity are called V-50) as polymerization initiator.Under stirring state, polymerisation is carried out 10 hours to obtain polymeric dispersions (pH3) under 53 ℃ of temperature, and wherein the fine particle of 10-20 μ is dispersed in the saline solution.This dispersion is called as " sample-3 ".
The viscosity of above-mentioned polymeric dispersions (sample-3) is 500mpa.s or lower, fine particle even described dispersion still can discerned by microscope with behind 10 times of the distilled water dilutings, and this polymer to be proved be water-insoluble basically.Aqueous sodium carbonate is mixed mutually with above-mentioned dispersion, regulate dispersion pH to 7, after this, polymer dissolution, its molecular weight is measured by the inherent viscosity based on the above-mentioned aqueous solution.Preparation embodiment-4
Be equipped with in the reactor of agitator, nitrogen breather pipe and temperature controller one, with 20 parts of monomer compositions of forming by 10% (mole) acrylic acid, 70% (mole) acrylamide and 20% (mole) acrylonitrile, and 1 part of conduct that wherein is added with the 3mol benzyl chloride to disperse the penten of meter to be dissolved in 79 parts of concentration be in the sodium-chloride water solution of 20% (weight).After this,, add 2,2 '-azo two (2-amidine propane) dihydrochloride (Wako Pure ChemicalIndustries Co., Ltd makes, trade name V-50) as polymerization initiator.Under stirring state, polymerisation was carried out 10 hours under 53 ℃ of temperature, obtained polymeric dispersions (pH3), and wherein, the fine particle of 10-20 μ m is dispersed in the saline solution.This dispersion is called as " sample-4 ".
Described polymeric dispersions (sample-4) viscosity is 500mpa.s or lower, fine particle even still can discern by microscope with behind 10 times of the distilled water dilutings, and this polymer to be proved be water-insoluble basically.
Aqueous sodium carbonate and described dispersion are mixed mutually to regulate dispersion PH to 7, and after this, polymer dissolution can be measured molecular weight by the inherent viscosity based on the described aqueous solution.
Sample-1 to the polymer features of sample-4 is listed in table 1.
Table 1
| NO. | The sample title | Monomer (% (mole)) | Molecular weight | ||
| AAC | AAM | AN | |||
| 1 | Sample-1 | 15 | 55 | 30 | 2,000,000 |
| 2 | Sample-2 | 30 | 45 | 25 | 3,000,000 |
| 3 | Sample-3 | 30 | 60 | 10 | 2,500,000 |
| 4 | Sample-4 | 10 | 70 | 20 | 3,700,000 |
AAc: acrylic acid AAm; Acrylamide AN: acrylonitrile surface coated measure of merit-1
The polymer dispersed body and function PH of present embodiment is the dilution of 3.0 acid water, to prepare the aqueous dispersion that a kind of polymer concentration is 2.0% dilution.Utilization is coated with rod and is coated with on the paper that dispersion that roller will dilute is applied to commercially available mean quality (quantitative: 55g/m
2, Daishowa paper Co., Ltd produces, neutralized paper), and 105 ℃ of dryings 5 minutes, to obtain coated paper.The consumption of coated polymeric is 0.1g/m and 0.2g/m
2The test result of pop strength and surface strength is listed in table 2.
Table 2 paper strength measure of merit result
| NO. | The sample title | Coating weight (g/m) | Burst factor | Surface strength WAX PIC |
| 1 | Sample-1 | ????0.1 | ????2.15 | ????12A |
| 2 | Sample-1 | ????0.2 | ????2.24 | ????13A |
| 3 | Sample-2 | ????0.1 | ????2.13 | ????12A |
| 4 | Sample-3 | ????0.1 | ????2.12 | ????12A |
| 5 | Sample-4 | ????0.1 | ????2.12 | ????12A |
| 6 | It only is acid starch | ????0.5 | ????1.50 | ????11A |
| 7 | No coating | ????0 | ????1.30 | ????8A |
WAXPIC: measure the pop strength test according to TAPPI (paper pulp and paper industry technological associations) T459os-75: TAPPIT403om-85 surface coated measure of merit-2
With the polymer dispersed body and function pH of present embodiment be 3.0 acid water dilution back add acid starch with the preparation polymer concentration be 2.0%, acid starch concentration is 2.0% coating fluid.Utilize the braking club coating machine that this coating fluid is applied to and quantitatively be 60g/m
2The paper of mean quality on dry then to obtain coated paper.The consumption of coated polymeric is 0.19/m
2And 0.29/m
2The test result of pop strength and surface strength is listed in table 3.
Table 3 paper strength measure of merit result
| ????NO． | The sample title | Coating consumption (g/m) | Burst factor | Surface strength WAXPIC |
| ????1 | Sample-1 | ????0.1 | ????2.15 | ????12A |
| ????2 | Sample-1 | ????0.2 | ????2.24 | ????13A |
| ????3 | Sample-2 | ????0.1 | ????2.14 | ????12A |
| ????4 | Sample-2 | ????0.2 | ????2.24 | ????13A |
| ????5 | Be acid starch | ????0.6 | ????1.50 | ????llA |
| ????6 | No coating | ????0.6 | ????1.50 | ????llA |
Can easily be applied on the paper with the form of dilute dispersion by the paper surface coating fluid of paper strengthening agent of the present invention preparation, and make paper have high paper strength with low viscosity and works fine performance.Spraying paper strength measure of merit
In Niagara type beater, old corrugated board is pulled an oar, and Canadian Standard Freeness (C.S.F) is transferred to 400ml, with preparation paper pulp.Liquid adhesive body with 2% is added in the described paper pulp, stirs then and obtains uniform mixture.Gained paper pulp is diluted to 0.5%, and utilizes the handmade paper tester to obtain quantitatively being 125g/m, water content is 96% l Water Paper A.By a nozzle, under 2 atmospheric pressure,, be that the dilute dispersion of each sample of 0.25% is sprayed on the described l Water Paper A one side with polymer concentration according to the consumption (solid constituent of polymers compositions/paper pulp) of table 4 polymer, the reverse side at l Water Paper vacuumizes subsequently.This is that a typical case who sprays to be formed paper by paper pulp at wet end tests.Then, l Water Paper A is placed between the blankets and with testing extruder squeezing twice, the dry then paper that obtains being used to measure paper strength.
For after measuring paper strength adjusting gained paper humidity, measure the pop strength and the ring crush intensity of paper, it the results are shown in table 4.
Table 4 paper strength measure of merit result
| ????NO． | The sample title | Addition (%) | Factor breaks | The ring-type crushing strength |
| ????1 | Sample-1 | ????0.3 | ????2.15 | ????15.02 |
| ????2 | Sample-2 | ????0.3 | ????2.14 | ????15.01 |
| ????3 | Sample-3 | ????0.3 | ????2.14 | ????15.00 |
| ????4 | Sample-4 | ????0.3 | ????2.14 | ????15.01 |
| ????5 | Comparative sample-A | ????0.3 | ????1.89 | ????14.12 |
| ????6 | Comparative sample-B | ????0.3 | ????1.90 | ????14.12 |
| ????7 | Blank | ????0 | ????1.50 | ????11.73 |
Attention: comparative sample-A is a kind of commercialization mannic paper strengthening agent (Arakawa Chemical Co., Ltd product that is used for wet end, trade name: Polystron 609), and comparative sample-B is-(Seiko ChemicalIndustries Co., Ltd produces, trade name: Stargum FN) ring is pressed test: TAPPI T472wd-76 kind to be used for the commercialization Hoffman response type paper strengthening agent of wet end
Can easily spray according to paper strengthening agent of the present invention with a kind of form with dilute dispersion of low viscosity and works fine performance, and paper can have good retention and high strength, spray nozzle clogging or uneven cementation can not occur.
Though the preferred embodiment of the invention represents and describes, be appreciated that the present invention is not limited thereto, and those skilled in the art can do a large amount of changes and improvements and not exceed affiliated scope in the claim of the present invention here to the present invention.
Claims (12)
1. paper strengthening agent, it contains a kind of polymeric dispersions, described polymeric dispersions be by with containing in the aqueous solution (methyl) acrylic acid monomer polymerization, with the form of fine particle the resulting polymers precipitation is made then, and described dispersion is added in the ply of paper of formation, wherein
(1) concentration of (methyl) acrylic acid (being total to) polymers in the described polymeric dispersions is at least 5% (weight),
(2) average particulate diameter of (methyl) acrylic acid (being total to) polymers is 1-100 μ m in the described polymeric dispersions,
(3) described polymeric dispersions just make and make one month after viscosity be 30-5000mpa.s,
(4) polymer particle can be in microscopic examination and the identification that will behind 10 times of the described polymer dispersed body and function distilled water dilutings by multiplication factor be 400, and
(5) when the pH of the dispersion of described dilution is adjusted to 7.0 by adding a kind of alkali, this polymer particle dissolving forms aqueous solution.
2. according to the paper strengthening agent of claim 1, wherein said polymeric dispersions is that polymerization also precipitates in the presence of dispersed retention agents, and wherein said retention agents comprises the multivalence electrolyte.
3. according to the paper strengthening agent of claim 1 or 2, wherein said dispersed retention agents is selected from: the cationic polymer electrolyte, have the surfactant of polyvalent cation hydrophilic radical and hydrophobic grouping, and composition thereof.
4. according to each paper strengthening agent of claim 1-3, the weight ratio that wherein contains (methyl) acrylic acid monomer and dispersed retention agents in the aqueous solution is 100: 1-10: 1.
5. according to each paper strengthening agent of claim 1-4, wherein said polymeric dispersions just make and make one month after viscosity be 30-1500mpa.s.
6. according to each paper strengthening agent of claim 1-5, wherein dispersed retention agents is dimethyl diallyl ammonium chloride (a being total to) polymers.
7. according to each paper strengthening agent of claim 1-5, wherein dispersed retention agents is the polyethylenepolyamine that alkyl replaces and/or aralkyl replaces.
8. according to the paper strengthening agent of claim 7, wherein dispersed retention agents is the penten that a kind of alkyl replaces and/or aralkyl replaces, and described alkyl group has at least 5 carbon atoms.
9. paper Enhancement Method may further comprise the steps: each paper strengthening agent dilute with water among the claim 1-8 to make the dispersion of dilution, applied described dilute dispersion or be impregnated on the dried paper, and dry treated dried paper.
10. paper Enhancement Method may further comprise the steps: each paper strengthening agent dilute with water among the claim 1-8 making the dispersion of dilution, and is impregnated into described dilute dispersion on the wet web of wet end.
11. as the paper Enhancement Method of claim 10, wherein the dispersion with dilution sprays to be impregnated on the wet web.
12. as the paper Enhancement Method of claim 10 or 11, wherein the wet web of handling with described dilute dispersion is an individual layer.
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| CN 99126332 CN1294227A (en) | 1999-10-28 | 1999-10-28 | Paper reinforcing agent and paper reinforcing method |
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| CN 99126332 CN1294227A (en) | 1999-10-28 | 1999-10-28 | Paper reinforcing agent and paper reinforcing method |
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| CN101608047A (en) * | 2008-06-19 | 2009-12-23 | 荒川化学工业株式会社 | Water-soluble polymer dispersion, paper strengthening agent, paper grade (stock) drainability rising agent and retention aid for paper making |
| CN101003957B (en) * | 2006-11-21 | 2010-05-19 | 杭州市化工研究院有限公司 | Dispersion liquid of polymer in use for papermaking, preparation method and application |
| CN113785029A (en) * | 2019-02-28 | 2021-12-10 | 索理思科技开曼公司 | Compositions and methods for increasing wet and dry paper strength |
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1999
- 1999-10-28 CN CN 99126332 patent/CN1294227A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101003957B (en) * | 2006-11-21 | 2010-05-19 | 杭州市化工研究院有限公司 | Dispersion liquid of polymer in use for papermaking, preparation method and application |
| CN100455721C (en) * | 2006-12-25 | 2009-01-28 | 上海东升新材料有限公司 | Reinforcement agent for yarn tube paper and its preparing method |
| CN101608047A (en) * | 2008-06-19 | 2009-12-23 | 荒川化学工业株式会社 | Water-soluble polymer dispersion, paper strengthening agent, paper grade (stock) drainability rising agent and retention aid for paper making |
| CN101608047B (en) * | 2008-06-19 | 2014-10-29 | 荒川化学工业株式会社 | Water-soluble polymer dispersion liquid, paper strengthening agent, drainability improving agent and retention agent for making paper |
| CN113785029A (en) * | 2019-02-28 | 2021-12-10 | 索理思科技开曼公司 | Compositions and methods for increasing wet and dry paper strength |
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