CN102720094B - Branch type dry strength agent and preparation method thereof - Google Patents
Branch type dry strength agent and preparation method thereof Download PDFInfo
- Publication number
- CN102720094B CN102720094B CN201210223728.1A CN201210223728A CN102720094B CN 102720094 B CN102720094 B CN 102720094B CN 201210223728 A CN201210223728 A CN 201210223728A CN 102720094 B CN102720094 B CN 102720094B
- Authority
- CN
- China
- Prior art keywords
- solution
- monomer
- acid
- dry strength
- add
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Paper (AREA)
Abstract
The invention discloses a branch type dry strength agent and a preparation method thereof. The preparation method comprises the following steps of: firstly, mixing acrylamide, negative ion monomers, positive ion monomers, crosslinking agent monomers, a photoinitiator, water and other functional monomers to obtain solution A; secondly, mixing a chain transfer agent and water to obtain solution B; thirdly, polymerizing 40%-60% of the solution A and 20%-40% of the solution B by ultraviolet ray irradiation; fourthly, adding 20%-30% of the solution A and 20%-30% of the solution B into the mixed solution in the third step to be subjected to polymerization by ultraviolet ray irradiation; fifthly, adding the residual solution A and the residual solution B into the mixed solution in the fourth step to be subjected to polymerization by ultraviolet ray irradiation until the viscosity of the solution meets requirements; and sixthly, adjusting the pH and solid content of weight of the mixed solution in the fifth step, and adding free radical catcher into the mixed solution to obtain the branch type dry strength agent. According to the branch type dry strength agent and the preparation method, the operation is simple, the viscosity is easy to control, the dispersibility of the branch type dry strength agent in water is good, the properties of ring crush, fold resistance, breaking resistance, tension resistance, internal bonding strength and the like of paper can be improved.
Description
Technical field
The present invention relates to dry strength agent and preparation technology thereof for papermaking.
Background technology
Dry strength agent is a class important chemical that increases paper strength in paper industry, is generally used for compensation and adds the decline of filler or the caused paper intensity of low-grade fiber (as regenerated fiber).Many water miscible, the high polymer that can form Hydrogenbond with fiber can become dry strength agent.
Conventional dry strength agent has natural polymer if starch and modifier (cationic starch, anionic starch, crosslinked starch etc.) thereof, synthetic polymer are as polyacrylamide, polyvinyl alcohol etc. and other water-soluble natural product type dry strength agent (as guar gum and derivative thereof etc.).In most of the cases, only add such material of mass fraction 0.1% ~ 0.75% just can reach effectively dry potent fruit.
In recent years, China's waste paper resource utilization rises year by year, and development potentiality is huge.But the raising of the utilization rate of waste paper means waste paper and recycles the increase of number of times, can cause declining to a great extent of paper strength index, strengthens paper strength so need to add dry strength agent.Along with constantly rising to paper and Board demand in consumption market, pull the rapid growth of dry strength agent demand.Study of Paper-Strengthening Agent Based has been widely used in the production process of all kinds of paper and cardboard, in order to the dry strength of remarkable increase paper and cardboard, reduces high-quality raw material consumption, reduces production costs; Or raising product specification, the more and more higher quality requirement constantly proposing to meet user.
The best dry strength agent of effect is polyacrylamide and copolymer thereof at present, comprises anion-polyacrylamide, cationic-type polyacrylamide and amphiprotic polyacrylamide.Wherein amphiprotic polyacrylamide shows best effect.Polyacrylamide also divides direct linkage type and branched chain type structure.The polyacrylamide that the degree of branching is high has better effect.
Main flow and the trend of synthesized high-performance dry strength agent are the branched chain type amphiphilic polymers of synthetic molecular weight and modest viscosity at present.This dry strength agent can play the dry humidification of good paper in the situation that not adding aluminum sulfate.Normal employing adds the method for crosslinking agent to obtain branched chain type dry strength agent, but often has a common problem, is exactly course of reaction control problem, and the viscosity of resulting polymers often there will be excessive or too small problem, controls the improper gelation that also often there will be.
Conventionally synthetic dry strength agent can adopt raw material once to add or progressively these two kinds of methods of dropwise reaction of raw material.But all there are some defects in these two kinds of methods: the method that raw material once adds, because reactant concentration is higher, is easy to produce implode and then produces gelation effect; And progressively drip mode, the monomer first adding forms polymer under lower concentration, the monomer then adding is in the solution for continuous reflection of these polymer, can keep like this monomer concentration to remain on reduced levels always, prevent implode, still when polymer solution reaches after certain viscosity, after the monomer and the initator that add cannot be stirred evenly in system in time, and then cause local concentration excessive, and producing local implode and gelation, this is also the problem that needs solve.
Summary of the invention
The object of this invention is to provide a kind of branched chain type dry strength agent and preparation method thereof, the defect existing to overcome prior art.
Method of the present invention, comprises the steps:
(1) in inert atmosphere, the water of acrylamide, anionic monomer, cationic monomer, cross-linkable monomer, light trigger, gross weight 50～65% and other functional monomers are mixed, obtain solution A;
(2) in inert atmosphere, the water of chain-transferring agent and surplus is mixed, obtain solution B;
(3) in inert atmosphere, by 20 ~ 40%, 70 ~ 95 DEG C of 40 ~ 60% and solution B gross weight of solution A gross weight, polymerization 50 ~ 70 minutes under UV-irradiation;
(4) then add solution A gross weight 20 ~ 30% and solution B gross weight 20 ~ 30%, continue under UV-irradiation polymerization 25 ~ 35 minutes;
(5) add again the solution A of surplus and the solution B of surplus, when the viscosity while being polymerized to 25 DEG C is 3000～10000mPas, stop UV-irradiation under continuation UV-irradiation;
(6) add pH adjusting agent to regulate pH to 4～6, add water regulating weight solid content to 14%～16%, add free radical scavenger to mix, to ensure the storage stability of product, obtain product;
In above step (1)～(5), parts by weight of raw materials proportioning following (raw material calculates with effective content 100%):
Wherein:
Described cationic monomer is selected from (methyl) acrylyl oxy-ethyl-trimethyl salmiac, (methyl) dimethylaminoethyl acrylate, (methyl) acrylic acid lignocaine ethyl ester, diallyldimethylammonium chloride, dimethylamino propyl acrylamide etc. with more than one in tertiary amino monomers or quaternary ammonium salt monomer; Add cationic monomer unit can make dry strength agent and paper fibre there is better adhesion;
Described anionic monomer is more than one in the monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, maleic anhydride, sodium vinyl sulfonate, vinylbenzenesulfonic acid sodium, sodium allylsulfonate and methallylsulfonic acid sodium or its esters; Add anionic moiety can make dry strength agent have the larger scope of application, and can catch the anionic trash in paper pulp;
Described cross-linkable monomer is that di-vinyl monomers (as methylene-bisacrylamide etc.), trivinyl monomer are (as N, N-diallyl acrylamide etc.) or the activated monomer of other tools (as N, N methacrylamide etc.) in one or more, the participation of cross-linkable monomer, can make polymer produce side chain easily;
Described other functional monomers can be one or more in some soft monomers (as hydroxy-ethyl acrylate, hydroxypropyl acrylate), hard monomer (as styrene, methyl methacrylate), hydrophobic monomer (as alkyl acrylate, alkyl methacrylate etc.).Various functional monomers are in order to adjust the performance of dry strength agent in some special aspects.Soft monomer can improve the performance of dry strength agent aspect paper folding strength, and hard monomer can be strengthened dry strength agent in the performance of improving on paper ring crush index, and hydrophobic monomer can improve the dispersiveness of dry strength agent in water.
Described photoinitiator is benzophenone, benzophenone soluble derivative, styrax analog derivative, fluorescein and eosin etc.
Described chain-transferring agent can be for inorganic chain-transferring agent (as sodium hydrogensulfite, sodium pyrosulfite and sodium thiosulfate etc.), organic chain transfer agent (as positive lauryl mercaptan, tert-dodecyl mercaptan, TGA, mercaptoethanol, other materials, isopropyl alcohol etc. with sulfydryl) with one or more in allylic monomer.
Described free radical scavenger is the material (as sodium hydrogensulfite, ascorbic acid etc.) that various water-soluble polymerization inhibitors (as hydroquinones, benzoquinones, iron chloride, Schweinfurt green etc.) maybe can consume free radical.
Described pH adjusting agent determines as the case may be, and before system pH regulates, higher than 6 time, pH adjusting agent is acids (example hydrochloric acid, sulfuric acid, acetic acid, phosphoric acid etc.); Before system pH regulates, lower than 4 time, pH adjusting agent is bases (as NaOH, ammoniacal liquor etc.).
Described ultraviolet source is high-voltage mercury lamp, and its wavelength is 100 ~ 1000nm, and its power is according to the size adjustment of reaction vessel.
The present invention is taking acrylamide, anionic monomer, cationic monomer, cross-linkable monomer, chain-transferring agent and other functional monomers as raw material, in the situation that continuing logical nitrogen, adopt UV-irradiation photoinitiator initiated polymerization to obtain, course of reaction adopts the method for subsection charging.Monomer, initator and chain-transferring agent take points three sections to add, each reinforcedly all complete in the short period of time.Such method can be avoided raw material once to add and progressively drip problem separately, on the one hand, can keep the interior monomer of system and initiator concentration at lower concentration level, on the other hand, after the material solution that adds system is had to a diluting effect, the raw material that is conducive to newly add is uniformly dispersed in system, prevents that local concentration is too high.Due to light-initiated feature, free radical can produce in a short period of time, also can disappear in a short period of time, therefore the method is compared conventional synthetic method and is had simple to operate, viscosity is easy to control, the advantages such as gelation can be effectively prevented, all moderate dry strength agents of molecular weight, the degree of branching and viscosity can be obtained.
By regulating the ratio of soft or hard monomer, the ratio of zwitterion, and by adding cross-linkable monomer to introduce branched structure, make dry strength agent there is good performance, add the performances such as the ring pressure that can improve into well paper after paper pulp, folding, resistance to broken, anti-tensile, paper internal bond strength.In addition, the branched structure that this dry strength agent has and suitable hydrophilic and hydrophobic matter, make it have less viscosity, has good dispersiveness in water, can dilute easily, easy to use.
There is few, the effective feature of consumption with the synthetic dry strength agent of this method.Can in the production of the multiple paper kinds such as boxboard, fluting medium, art paper, cop tube paper, speciality paper, use, play the effect that increases paper dry strength, especially, in the time starching as paper making raw material with reclaimed waste paper, effect is more remarkable.Such dry strength agent can have the dry effect that strengthens of outstanding paper in the situation that not adding aluminum sulfate.
Detailed description of the invention
In embodiment, if no special instructions, percentage is all weight percentage.
Embodiment 1
Water 355g, acrylamide 118g, itaconic acid 2g, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride 16g, methylene-bisacrylamide 0.08g, hydroxypropyl acrylate 4g, ethyl acrylate 2g and benzophenone 1g are uniformly mixed, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 3 times, obtain solution A;
By even to sodium allylsulfonate 1g and 50g water stirring and dissolving, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 3 times, obtain solution B;
Add through High Purity Nitrogen and rinse and drive in the reactor of oxygen 30% of 50% and solution B of solution A, be warmed up to 75 DEG C, open ultraviolet lamp reactor is irradiated, carry out light initiation polymerization 60 minutes;
In reactor, continue to add solution A 25% and solution B 25% carry out light initiation polymerization 30 minutes;
In reactor, continue to add 45% the carrying out light initiation polymerization to viscosity and reach 4200mP*s(25 DEG C of 25% and solution B of solution A), after stop UV-irradiation.
Add liquid caustic soda (32%, weight) to regulate pH to 5.0, finally add hydroquinones 0.02g, add water and regulate solid content to 20%, be final products.
Embodiment 2
. water 350g, acrylamide 110g, maleic anhydride 2g, (methyl) dimethylaminoethyl acrylate 10g, DMAA 0.9g, hydroxy propyl methacrylate 15g, styrene 5g and benzophenone 0.7g are uniformly mixed, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 3 times, obtain solution A; By even to sodium allylsulfonate 0.6g and 60g water stirring and dissolving, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 3 times, obtain solution B; Add through High Purity Nitrogen and rinse and drive in the reactor of oxygen 30% of 50% and solution B of solution A, be warmed up to 80 DEG C, open ultraviolet lamp reactor is irradiated, carry out light initiation polymerization 55 minutes; In reactor, continue to add solution A 25% and solution B 25% carry out light initiation polymerization 25 minutes; 45% the carrying out light initiation polymerization to viscosity and reach 5200mP*s of 25% and solution B that continues to add solution A in reactor, (25 DEG C), stop UV-irradiation.
Add sulfuric acid (15%) to regulate pH to 4.6, finally add copper sulphate 0.01g, add water and regulate solid content to 20%, be final products.
Embodiment 3
Water 450g, acrylamide 82g, maleic acid 1g, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride 10g, DMAA 0.5g, styrene 2g, hydroxypropyl acrylate 1g, ethyl acrylate 5g and eosin 0.7g are uniformly mixed, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 2 times, obtain solution A; By even to TGA 0.005g and 120g water stirring and dissolving, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 2 times, obtain solution B; Add through High Purity Nitrogen and rinse and drive in the reactor of oxygen 25% of 40% and solution B of solution A, be warmed up to 85 DEG C, open ultraviolet lamp reactor is irradiated, carry out light initiation polymerization 70 minutes; In reactor, continue to add solution A 35% and solution B 35% carry out light initiation polymerization 25 minutes; In reactor, continue to add 40% the carrying out light initiation polymerization to viscosity and reach 3700mP*s(25 DEG C of 25% and solution B of solution A), after stop UV-irradiation.
Add liquid caustic soda (32%) to regulate pH to 4.8, finally add hydroquinones 0.01g, add water and regulate solid content to 15%, be final products.
Embodiment 4
Water 350g, acrylamide 144g, acrylic acid 3g, dimethyl diallyl ammonium chloride 17g, DMAA 1g, hydroxypropyl acrylate 4g, styrene 2g and benzoin methyl ether 0.5g are uniformly mixed, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 3 times, obtain solution A; By even to sodium allylsulfonate 0.6g, lauryl mercaptan 0.002g and 70g water stirring and dissolving, repeatedly vacuumize logical High Purity Nitrogen and drive oxygen 3 times, obtain solution B; Add through High Purity Nitrogen and rinse and drive in the reactor of oxygen 35% of 50% and solution B of solution A, be warmed up to 85 DEG C, open ultraviolet lamp reactor is irradiated, carry out light initiation polymerization 60 minutes; In reactor, continue to add solution A 25% and solution B 25% carry out light initiation polymerization 35 minutes; In reactor, continue to add 40% the carrying out light initiation polymerization to viscosity and reach 4500mP*s(25 DEG C of 25% and solution B of solution A), after stop UV-irradiation.
Add liquid caustic soda (32%) to regulate pH to 4.5, finally add Dichlorodiphenyl Acetate copper 0.01g, add water and regulate solid content to 30%, be final products.
Comparative example 1
In reactor, add successively water 550g, acrylamide 81g, acrylic acid 2g, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride 9g, methylene-bisacrylamide 0.1g, sodium allylsulfonate 0.1g to stir, logical nitrogen drives oxygen 60 minutes, be warmed up to 60 DEG C, add ammonium persulfate 0.5g(to be dissolved in 20g water), temperature of reaction kettle is risen to 82 DEG C, react viscosity after 30 minutes and increase sharply, temperature rises rapidly, gelation after a few minutes.
Comparative example 2
In reactor, add successively water 550g, acrylamide 81g, acrylic acid 2g, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride 9g, sodium allylsulfonate 0.2g to stir, logical nitrogen drives oxygen 60 minutes, be warmed up to 60 DEG C, add ammonium persulfate 0.5g(to be dissolved in 20g water), temperature of reaction kettle is risen to 82 DEG C, react and after 1 hour, start sampling and detect viscosity.Viscosity adds polymerization inhibitor to stop reaction after reaching 5000mPa*s.Regulate pH to 4 ~ 6, adding water move to solid content is 15%.
Comparative example 3
In reactor, add successively water 550g, acrylamide 81g, acrylic acid 2g, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride 9g, DMAA 0.8g, sodium allylsulfonate 0.2g stirs, logical nitrogen drives oxygen 60 minutes, be warmed up to 60 DEG C, add ammonium persulfate 0.5g(to be dissolved in 20g water), temperature of reaction kettle is risen to 82 DEG C, react and after 1 hour, start sampling and detect viscosity.Viscosity adds polymerization inhibitor to stop reaction after reaching 3500mPa*s.Regulate pH to 4 ~ 6, adding water move to solid content is 15%.The time interval of viscosity between 3000mPa*s and 10000mPa*s only has 10 minutes, is relatively difficult to control.
Embodiment 5
Adopt reclaimed waste paper case to pull an oar as raw material, beating degree adds dry strength agent to stir 5 minutes after reaching 35 ° of SR, after being shaped, semi-automatic sheet former adopts the squeezing of standard page squeezer, natural air drying, then detects the indexs such as the tensile strength, ring crush intensity, bursting strength, folding strength, internal bond strength of paper.Dry strength agent addition is 4.5 ~ 7.5 ‰ (dry/oven dry stocks).Table 2 has provided the application data of the prepared dry strength agent of said method.
Table 2. adds the handsheet intensity index (dry/oven dry stock) of dry strength agent
From above-described embodiment, comparative example and application examples, method therefor of the present invention has viscosity and is easy to control, and can effectively prevent gelation, easily prepares the advantages such as high solids content product.Have good application performance with the dry strength agent of the method synthesized, compare straight chain type dry strength agent (comparative example 2) and have significant advantage, branched chain type dry strength agent (comparative example 3) effect of comparing by conventional method synthesized has certain advantage.
The above not does any pro forma restriction to technical scheme of the present invention only as part embodiment of the present invention.Any simple modification, equivalent variations and modification that every technical spirit according to the present invention is done above embodiment, all still belong to technical scheme scope of the present invention.
Claims (8)
1. the preparation method of branched chain type dry strength agent, is characterized in that, comprises the steps:
(1) in inert atmosphere, the water of acrylamide, anionic monomer, cationic monomer, cross-linkable monomer, light trigger, gross weight 50～65% and other functional monomers are mixed, obtain solution A;
(2) in inert atmosphere, the water of chain-transferring agent and surplus is mixed, obtain solution B;
(3) in inert atmosphere, by 20～40%, 70～95 DEG C of 40～60% and solution B gross weight of solution A gross weight, polymerization 50～70 minutes under UV-irradiation;
(4) then add solution A gross weight 20～30% and solution B gross weight 20～30%, continue under UV-irradiation polymerization 25～35 minutes;
(5) add again the solution A of surplus and the solution B of surplus, when continuing to be polymerized to viscosity under UV-irradiation and reaching 3000～10000mPas, stop UV-irradiation;
(6) add pH adjusting agent to regulate pH, add water regulating weight solid content, add free radical scavenger to mix, obtain product;
Raw material calculates with effective content 100%, and in step (1)～(5), parts by weight of raw materials proportioning is as follows:
Described other functional monomers are more than one in soft monomer, hard monomer or hydrophobic monomer;
Described soft monomer is hydroxy-ethyl acrylate or hydroxypropyl acrylate, and described hard monomer is that styrene or methyl methacrylate, described hydrophobic monomer are alkyl acrylate or alkyl methacrylate.
2. method according to claim 1, it is characterized in that, described cationic monomer is selected from (methyl) acrylyl oxy-ethyl-trimethyl salmiac, (methyl) dimethylaminoethyl acrylate, (methyl) acrylic acid lignocaine ethyl ester, diallyldimethylammonium chloride, dimethylamino propyl acrylamide etc. with more than one in tertiary amino monomers or quaternary ammonium salt monomer;
Described anionic monomer is more than one in the monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid, maleic anhydride, sodium vinyl sulfonate, vinylbenzenesulfonic acid sodium, sodium allylsulfonate and methallylsulfonic acid sodium or its esters;
Described cross-linkable monomer is one or more in di-vinyl monomers, trivinyl monomer or the activated monomer of other tools.
3. method according to claim 2, is characterized in that, described cross-linkable monomer is that methylene-bisacrylamide, described trivinyl monomer are N, and N-diallyl acrylamide, the activated monomer of described other tools are N,N-DMAA.
4. method according to claim 1, is characterized in that, described light trigger is benzophenone, benzophenone soluble derivative, styrax analog derivative, fluorescein or eosin.
5. method according to claim 1, it is characterized in that, described chain-transferring agent is sodium hydrogensulfite, sodium pyrosulfite, sodium thiosulfate, positive lauryl mercaptan, tert-dodecyl mercaptan, TGA, mercaptoethanol, other materials with sulfydryl, isopropyl alcohol or and with one or more in allylic monomer;
Described free radical scavenger is hydroquinones, benzoquinones, iron chloride, Schweinfurt green, sodium hydrogensulfite or ascorbic acid;
Described pH adjusting agent is hydrochloric acid, sulfuric acid, acetic acid, phosphoric acid, NaOH or ammoniacal liquor.
6. method according to claim 1, is characterized in that, described ultraviolet source is high-voltage mercury lamp, and its wavelength is 100～1000nm.
7. method according to claim 1, is characterized in that, in step (6), adds pH adjusting agent to regulate pH to 4～6, adds water regulating weight solid content to 14%～16%.
8. the branched chain type dry strength agent of preparing according to method described in claim 1～7 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210223728.1A CN102720094B (en) | 2012-06-29 | 2012-06-29 | Branch type dry strength agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210223728.1A CN102720094B (en) | 2012-06-29 | 2012-06-29 | Branch type dry strength agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102720094A CN102720094A (en) | 2012-10-10 |
| CN102720094B true CN102720094B (en) | 2014-08-06 |
Family
ID=46945949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210223728.1A Active CN102720094B (en) | 2012-06-29 | 2012-06-29 | Branch type dry strength agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102720094B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103255671B (en) * | 2013-04-08 | 2015-05-20 | 上海东升新材料有限公司 | Preparation method of dry strength agent for papermaking |
| CN103408700A (en) * | 2013-07-09 | 2013-11-27 | 上海东升新材料有限公司 | Preparation method of amphoteric dry strength agent |
| CN103665258B (en) * | 2013-11-25 | 2016-08-17 | 康吉诺（北京）科技有限公司 | A kind of preparation method and applications of dry strengthening agent used for making papers |
| CN104628946A (en) * | 2015-02-13 | 2015-05-20 | 孙高雷 | Dry strength agent for coated paper and preparation method of dry strength agent |
| CN107189008A (en) * | 2017-06-16 | 2017-09-22 | 江苏富淼科技股份有限公司 | A kind of lower molecular weight amphiprotic polyacrylamide and preparation method thereof |
| CN109440527A (en) * | 2018-11-30 | 2019-03-08 | 江门市高力依科技实业有限公司 | A kind of synergistic agent and preparation method thereof of paper making wet part addition |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667187A (en) * | 2004-03-11 | 2005-09-14 | 大连广汇化学有限公司 | Method for preparing amphiprotic intensifier for paper |
| CN101086148A (en) * | 2007-06-28 | 2007-12-12 | 上海东升新材料有限公司 | Emulsion drying strengthening agent for paper and preparation method thereof |
| KR20090030542A (en) * | 2007-09-20 | 2009-03-25 | 주식회사 화성산업 | Dry strength agent of cation block type and producing method thereof |
| CN101487207A (en) * | 2009-02-16 | 2009-07-22 | 广州市星业科技发展有限公司 | Production method of anti-interference paper intensifier |
| CN101514239A (en) * | 2008-12-30 | 2009-08-26 | 上海东升新材料有限公司 | Amphoteric polyacrylamide and preparation method thereof |
-
2012
- 2012-06-29 CN CN201210223728.1A patent/CN102720094B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1667187A (en) * | 2004-03-11 | 2005-09-14 | 大连广汇化学有限公司 | Method for preparing amphiprotic intensifier for paper |
| CN101086148A (en) * | 2007-06-28 | 2007-12-12 | 上海东升新材料有限公司 | Emulsion drying strengthening agent for paper and preparation method thereof |
| KR20090030542A (en) * | 2007-09-20 | 2009-03-25 | 주식회사 화성산업 | Dry strength agent of cation block type and producing method thereof |
| CN101514239A (en) * | 2008-12-30 | 2009-08-26 | 上海东升新材料有限公司 | Amphoteric polyacrylamide and preparation method thereof |
| CN101487207A (en) * | 2009-02-16 | 2009-07-22 | 广州市星业科技发展有限公司 | Production method of anti-interference paper intensifier |
Non-Patent Citations (4)
| Title |
|---|
| 杜伟民 编译.聚丙烯酰胺类纸页增强剂的技术动向.《造纸化学品》.2008,第20卷(第3期),66-71. |
| 汪威 等.紫外光引发丙烯酰胺分散聚合研究.《高分子学报》.2005,(第3期),320-326. |
| 紫外光引发丙烯酰胺分散聚合研究;汪威 等;《高分子学报》;20050630(第3期);320-326 * |
| 聚丙烯酰胺类纸页增强剂的技术动向;杜伟民 编译;《造纸化学品》;20080630;第20卷(第3期);66-71 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102720094A (en) | 2012-10-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102720094B (en) | Branch type dry strength agent and preparation method thereof | |
| CN102627724B (en) | Paper dry intensifier and preparation method thereof | |
| CN103232573B (en) | Preparation method of polyacrylamide emulsion | |
| CN100558752C (en) | The fine-particled polymer dispersions that contains starch | |
| JP4894264B2 (en) | Composition comprising amphoteric water-soluble polymer | |
| CN102656192B (en) | Amyloid polymeric dispersions in small, broken bits, its production method and in papermaking as the purposes of sizing agent | |
| WO2007000419A1 (en) | Fine-particled polymer dispersions containing starch | |
| CN103554348B (en) | A kind of polymkeric substance, its preparation method and application | |
| CN108004841A (en) | A kind of Cypres and preparation method thereof | |
| CN104119480A (en) | High-branch type polyvinyl alcohol-acrylamide graft copolymer, preparing method thereof and applications of the copolymer | |
| JP5640458B2 (en) | Method for producing paper-making paper strength enhancer | |
| CN104628946A (en) | Dry strength agent for coated paper and preparation method of dry strength agent | |
| CN103408700A (en) | Preparation method of amphoteric dry strength agent | |
| CN103408701B (en) | The method that uv-light polymerization prepares drying strengthening agent | |
| CN101906734A (en) | Additive for papermaking | |
| CN108559475B (en) | Temperature-resistant salt-resistant polyvinyl acetate microsphere and preparation and application thereof | |
| CN103408702A (en) | Preparation method of graft-polymer cationic dry strength agent | |
| CN102617791B (en) | Amphoteric dry strength agent and preparation method thereof | |
| CN108642959A (en) | A kind of lignin Cypres and preparation method thereof | |
| AU2017207857B2 (en) | Use of an acrylate copolymer as retention aid in a method of making a substrate comprising cellulosic fibres | |
| CN104592444A (en) | Dry strength agent for packaging paperboard and preparation method thereof | |
| CN103421147A (en) | Preparation method for graft polymer type amphoteric dry strength agent | |
| CN103435752A (en) | Synthesis method for graft polymer-type amphoteric dry strength agent | |
| CN108532362A (en) | A kind of lignin sizing agent and preparation method thereof | |
| CN105237648B (en) | A kind of glyoxal cross-linked polymer is modified high amylopectin starch and its preparation method and application |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |