CN102121208B - Method for preparing papermaking dry strengthening agent - Google Patents
Method for preparing papermaking dry strengthening agent Download PDFInfo
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- CN102121208B CN102121208B CN 201010577577 CN201010577577A CN102121208B CN 102121208 B CN102121208 B CN 102121208B CN 201010577577 CN201010577577 CN 201010577577 CN 201010577577 A CN201010577577 A CN 201010577577A CN 102121208 B CN102121208 B CN 102121208B
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Abstract
The invention discloses a method for preparing a papermaking dry strengthening agent. The method comprises the following steps of: dissolving a mixture of 0.5 to 2.5 weight percent of modified starch and polyanionic cellulose by using pure water; then adding a copolymerized blended monomer consisting of acrylamide, acrylic acid or ester thereof, carboxylic acid ester and acrylonitrile into the mixture solution; after the substances are mixed completely, raising the temperature of the mixture to between 30 and 60 DEG C, and reacting the mixture for 1 to 3 hours at the temperature; adding pH regulator to regulate the pH value of the mixture to between 5.5 and 7, and adding cross-linking prevention agent, reaction inhibitor, regulator and multi-element composite catalyst in the reaction under the pH condition by adopting a one-step grafting copolymerization reaction technology respectively; and performing ageing reaction after the grafting copolymerization reaction is completed, adding acuring agent in the ageing reaction process, heating the reactants to the temperature of between 65 and 78 DEG C, and obtaining the papermaking dry strengthening agent after ageing for certain time. The papermaking dry strengthening agent can remarkably improve the dry strength and the tearing strength of paper.
Description
Technical field:
The invention belongs to the auxiliary agent preparing technical field in the paper technology, relate to a kind of preparation method of papermaking dry-strengthening agent.
Background technology:
In the dry strength agent that uses at present, the dry strength agent of starch based almost occupies the market share of the overwhelming majority.And with starch as dry strength agent, from its use procedure, need to its gelatinization be diluted with steam, and then through pump, technological process is complicated again, and has increased equipment and personnel's input; And the long-term a large amount of starch that use of paper manufacturing systems are as reinforcing agent, and are larger to the pollution of the plain boiled water of paper machine.In addition, the boiling gelatinization of starch needs power consumption, has not only consumed gas but also power consumption, is unfavorable for energy-saving and emission-reduction; The result of use of the dry strength agent of making from prior art, with its paper product of being produced as auxiliary agent: at 5-7N.m/g, the burst index of craft paper only has 1.5-2.0kpa.m such as the lateral loops Compressive Strength of watt rib paper
2/ g, the folding strength of above-mentioned 2 kinds of paper only has 20 times, and pop strength is poor.In addition, in China's paper industry raw material, because timber resource shortage, a large amount of paper making raw materials that use mainly are straw pulp, secondary stock at present, and these raw materials have a strong impact on the intensity of paper and cardboard because the shortcoming such as fiber is short, heteroproteose cell content is high, water retention value is high.
The preparation method of the dry strength agent of prior art to sum up exists that cost is high, power consumption is large, production procedure is complicated, and the dry strength agent of producing is to improving the defectives such as folding strength, ring crush intensity, pop strength be relatively poor.How solving preparation method and the existing many defectives of finished product of existing dry strength agent, has been problem of needing solution badly in the paper industry.
Summary of the invention:
The present invention is in order to overcome the existing problem of dry strength agent in the prior art, the preparation method of the papermaking dry-strengthening agent that provide that a kind of macromolecule low viscosity resin, easy to use, stable performance, cost are low, ring crush intensity and pop strength is high, wet end when this dry strength agent is used for papermaking adds and uses as top sizing, dry strength and the anti-intensity of tearing of paper can significantly be provided, obviously improve ring crush intensity and the slurry water filtering performance of paper, improve keeping of fine component, reduce the paper cost, increase economic efficiency, alleviate the processing pressure of paper waste.
The technical solution adopted for the present invention to solve the technical problems is: a kind of preparation method of papermaking dry-strengthening agent, and the step of its preparation dry strength agent is:
(1) converted starch of gross weight 0.5～2.5% and the mixture of polyanion cellulose composition are dissolved with pure water;
(2) copolymerization that then acrylamide, acrylic acid or its ester class, carboxylic esters and acrylonitrile the is formed monomer that is mixed adds in the mixture of step (1);
(3) above-mentioned substance mix complete after, mixture temperature is raised to 30 ℃～60 ℃, and under this temperature, reacted 1～3 hour;
(4) adding pH adjusting agent is adjusted to 5.5～7 to the pH value of mixture also carrying out with this understanding one-step method connects the skill copolyreaction;
(5) connect in one-step method and add respectively anti-crosslinking agent, reaction suppressor, conditioning agent, multiplex catalyst in the process of skill copolyreaction;
(6) connect the skill copolyreaction and enter into the ageing reaction process after complete, add curing agent in the ageing course of reaction, be heated to 65 ℃～78 ℃, ageing obtains papermaking dry-strengthening agent after a period of time.
The effect of ageing is: make the graft copolymerization of one-step method reaction more perfect, the side chain that generates in the molecule and copolymerization chain are firmly changed.Suitably improve temperature, can the promoting ageing process; Time is longer, and ageing is more complete.
As the further design to the aforementioned techniques scheme: the converted starch in the step (1) comprises one or two or more kinds in oxidized starch, cationic starch, phosphoric acid fat starch amphoteric starch, the dextrin.
As the further design to the aforementioned techniques scheme: aforesaid oxidized starch comprises hypochlorite oxidation starch, hydrogen peroxide oxidation starch.
As the further design to the aforementioned techniques scheme: the pH adjusting agent in the aforesaid step (4) is alkali metal hydroxide, and alkali metal hydroxide can be selected one or two or more kinds in NaOH, potassium hydroxide, the rubidium hydroxide; The PH conditioning agent also can be acidic materials, and acidic materials are one or two or more kinds of hydrochloric acid, sulfuric acid, acetic acid, acetic acid, citric acid, oxalic acid.
As the more further design to the aforementioned techniques scheme: the anti-crosslinking agent that adds in the aforesaid step (5) comprises ureas, sodium sulphate, sodium chloride, ethene amine and ammoniacal liquor; Reaction suppressor is one or both in quinone phenols, the many alkyl phenols; Conditioning agent is compound: one or two or more kinds in alcohols, isopropyl alcohol, ethylene glycol, the alkyl hydrosulfide; Multiplex catalyst is persulfate, peroxide, and persulfate is: one or two or more kinds of potassium peroxydisulfate, Ammonium Persulfate 98.5 and sodium salt thereof, and peroxide is: one or two or more kinds in hydrogen peroxide, benzoyl peroxide, the water-soluble azo class; Curing agent in the step (6) is the compound of reductant class, and its chemicals are one or two or more kinds in sodium sulfite, sodium hydrogensulfite, ethylene glycol amine, triethanolamine, the tertiary amines organic amine.
The preparation method of dry strength agent of the present invention compares with the dry strength agent preparation method of prior art, has following features and advantage:
1, preparation method of the present invention adopts one-step method to carry out simultaneously the preparation that grafting and multi-component copolymer reaction process technology are finished dry strength agent, with traditional independent graft reaction or separately copolyreaction, again or the method for copolyreaction behind the substep graft reaction is fully different.
2, the converted starch in the main raw material(s), polyanion cellulose, acrylamide, acrylicacidandesters class, carboxylic esters and acrylonitrile are based on the domestic market supply, sufficient raw, and cost is low.
3, the present invention uses converted starch as the main material delivering of dry strength agent, has solved can only use cationic starch and anionic starch as the defective of dry strength agent in traditional handicraft.
4, preparation method of the present invention can improve the ring crush intensity index 10%～20% of paper, improves the burst index of paper more than 15%, and can improve retention aid and filtering aid, increases the retention rate of fiber fines, and dry strength.
5, preparation method's technique of the present invention is simple, cost is low, pollution is few, and the converted starch price that the present invention uses is lower than cationic starch and the anionic starch that uses in the conventional method.
The specific embodiment:
Below in conjunction with embodiment the present invention is described in further detail.
Embodiment 1
The oxidized starch sodium chlorate of gross weight 0.5% and the mixture of polyanion cellulose are stirred with the pure water dissolving rear the adding in the reaction flask, the copolymerization that add 8.2 gram acrylamides, 1.2 acrylic acid, 2.6 carboxylic esters and the 3 gram acrylonitrile compositions monomer that is mixed, temperature is raised to 30 ℃, and under this temperature, reacted 1 hour; The adding weight concentration is 30% sodium hydroxide solution, adjust pH to 5.5, one-step method occurs with this understanding connect the skill copolyreaction, in the process that connects the skill copolyreaction, add sodium sulphate, many alkyl phenols, ethylene glycol, hydrogen peroxide, connect the skill copolyreaction and enter into the ageing reaction process after complete, in the ageing course of reaction, add sodium sulfite, be heated to 65 ℃, just can metering packing after ageing a period of time.
The actual measurement paper strengthens effect and sees the following form
Embodiment 2
The cationic starch of gross weight 1.5% and the mixture of phosphoric acid fat starch amphoteric starch and polyanion cellulose are stirred with the pure water dissolving rear the adding in the reaction flask, the copolymerization that add 6.1 gram acrylamides, 1.5 esters of acrylic acids, 3.2 carboxylic esters and the 3.5 gram acrylonitrile compositions monomer that is mixed, temperature is raised to 45 ℃, and under this temperature, reacted 2 hours; The adding weight concentration is 30% potassium hydroxide and rubidium hydroxide mixed solution, adjust pH to 6.5, one-step method occurs with this understanding connect the skill copolyreaction, in the process that connects the skill copolyreaction, add sodium chloride, quinone phenols and many alkyl phenols, alcohols and isopropyl alcohol, potassium peroxydisulfate and Ammonium Persulfate 98.5, connect the skill copolyreaction and enter into the ageing reaction process after complete, in the ageing course of reaction, add ethylene glycol amine and triethanolamine, be heated to 70 ℃, just can metering packing after ageing a period of time.
The actual measurement paper strengthens effect and sees the following form:
Embodiment 3
The dextrin of gross weight 2.5% and the mixture of polyanion cellulose are stirred with the pure water dissolving rear the adding in the reaction flask, the copolymerization that add 6.5 gram acrylamides, 1.8 acrylic acid, 3.5 carboxylic esters and the 2 gram acrylonitrile compositions monomer that is mixed, temperature is raised to 60 ℃, and under this temperature, reacted 3 hours; The adding weight concentration is 30% hydrochloric acid and sulfuric acid mixed solution, adjust pH to 7, one-step method occurs with this understanding connect the skill copolyreaction, in the process that connects the skill copolyreaction, add ethene amine and ammoniacal liquor, quinone phenols, alkyl hydrosulfide, benzoyl peroxide and water-soluble azo class, connect the skill copolyreaction and enter into the ageing reaction process after complete, in the ageing course of reaction, add sodium hydrogensulfite, be heated to 78 ℃, just can metering packing after ageing a period of time.
The actual measurement paper strengthens effect and sees the following form
The above only is preferred embodiment of the present invention, is not technical scheme of the present invention is done any pro forma restriction.Every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment does.
Claims (4)
1. the preparation method of a papermaking dry-strengthening agent is characterized in that: the step of preparation dry strength agent is:
(1) converted starch of gross weight 0.5～2.5% and the mixture of polyanion cellulose composition are dissolved with pure water;
(2) copolymerization that then acrylamide, acrylic acid or its ester class, carboxylic acid ester and acrylonitrile the is formed monomer that is mixed joins in the mixture of step (1);
(3) after above-mentioned substance mixes, mixture temperature is raised to 30 ℃～60 ℃, and under this temperature, reacted 1～3 hour;
(4) adding pH adjusting agent is adjusted to 5.5～7 to the pH value of mixture and also carries out with this understanding the one-step method graft copolymerization;
(5) in the process of one-step method graft copolymerization, add respectively anti-crosslinking agent, reaction suppressor, conditioning agent, multiplex catalyst;
(6) graft copolymerization enters into the ageing reaction process after complete, adds curing agent in the ageing course of reaction, is heated to 65 ℃～78 ℃, and ageing obtains papermaking dry-strengthening agent after a period of time.
2. method according to claim 1, it is characterized in that: the converted starch in the described step (1) comprises one or two or more kinds in oxidized starch, cationic starch, phosphoric acid fat type amphoteric starch, the dextrin.
3. method according to claim 2, it is characterized in that: described oxidized starch is hypochlorite oxidation starch or hydrogen peroxide oxidation starch.
4. method according to claim 3, it is characterized in that: the pH adjusting agent in the described step (4) is alkali metal hydroxide, and alkali metal hydroxide is selected one or two or more kinds in NaOH, potassium hydroxide, the rubidium hydroxide; PH adjusting agent is acidic materials, and acidic materials are one or two or more kinds of hydrochloric acid, sulfuric acid, acetic acid, citric acid, oxalic acid.
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| CN 201010577577 CN102121208B (en) | 2010-12-03 | 2010-12-03 | Method for preparing papermaking dry strengthening agent |
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| CN 201010577577 CN102121208B (en) | 2010-12-03 | 2010-12-03 | Method for preparing papermaking dry strengthening agent |
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| CN102121208B true CN102121208B (en) | 2013-01-09 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102627730B (en) * | 2012-03-29 | 2014-01-29 | 上海东升新材料有限公司 | Amphoteric dry strength agent and preparation method thereof |
| WO2014074086A1 (en) * | 2012-11-06 | 2014-05-15 | Empire Technology Development Llc | Copolymers of starch and cellulose |
| CN104894917A (en) * | 2015-06-08 | 2015-09-09 | 浙江华川实业集团有限公司 | Base paper containing dry-strength agent and preparation method of base paper |
| CN105484100B (en) * | 2015-11-18 | 2017-12-26 | 江门市高力依科技实业有限公司 | A kind of preparation method of fiber fines retention and drainage aid agent |
| CN106939530A (en) * | 2017-02-22 | 2017-07-11 | 镇江市天亿化工研究设计院有限公司 | A kind of drying strengthening agent and preparation method thereof |
| CN108035199A (en) * | 2017-12-11 | 2018-05-15 | 福建省联盛纸业有限责任公司 | A kind of craft paper 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 |
| CN109487620A (en) * | 2018-12-05 | 2019-03-19 | 江门市高力依科技实业有限公司 | A kind of papermaking dry-strengthening agent and preparation method thereof |
| CN113981734A (en) * | 2021-11-18 | 2022-01-28 | 上海昶法新材料有限公司 | Natural polymer modified reinforcing agent and preparation method thereof |
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| US6090871A (en) * | 1994-05-11 | 2000-07-18 | Bayer Aktiengesellschaft | Paper finishing aid |
| US5824190A (en) * | 1995-08-25 | 1998-10-20 | Cytec Technology Corp. | Methods and agents for improving paper printability and strength |
| EP2164908A1 (en) * | 2007-07-05 | 2010-03-24 | Basf Se | Method for producing aqueous suspensions of fine particulate fillers and use thereof for producing papers having a high filler content and a high dry strength |
| US8604134B2 (en) * | 2007-08-02 | 2013-12-10 | Hercules Incorporated | Modified vinylamine-containing polymers as additives in papermaking |
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