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Preparation method for papermaking dry-strength agent with temporary wet-strength improving effect

A temporary, dry strength agent technology, applied in the field of polymer chemistry, can solve the problems of reduced aldehyde group reactivity and product storage stability, and achieve easy retention and adsorption, resistance to anion garbage interference, and improved dry strength Effect

Inactive Publication Date: 2016-03-09
ZHEJIANG TRANSFAR WHYYON CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, the activity of the aldehyde group on the molecular chain of the hydroformylated modified polyacrylamide product is relatively high, and the intermolecular crosslinking reaction will still slowly occur when stored at room temperature, forming a gel, resulting in a serious decline in the storage stability of the product, and There is no good way to further reduce this high aldehyde group reactivity.

Method used

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  • Preparation method for papermaking dry-strength agent with temporary wet-strength improving effect

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] ①Acrylamide 1.78g (0.025mol), N-methylolacrylamide 42.93g (0.425mol), diallyl dimethyl ammonium chloride 7.48g (solid content 65%, 0.03mol), methyl Dimethylaminoethyl acrylate 2.36g (0.015mol), methacrylic acid 0.43g (0.005mol), diethylene glycol diacrylate 0.0054g (0.25×10 -4 mol), 80 g of deionized water were mixed evenly to obtain monomer solution I, and an appropriate amount of dilute sulfuric acid was added to adjust the pH value of monomer solution I to 3;

[0023] ②Mix 1.05g of azobisisobutylimidazoline hydrochloride VA-044 with 90g of deionized water to obtain initiator solution II;

[0024] ③Put 1 / 3 of the monomer solution I and 130g of deionized water into a four-necked flask equipped with a reflux condenser, an air guide tube, and a thermometer, and heat up to 55°C after blowing nitrogen gas, and add 1 / 3 of the initiator into the system Solution II, heat preservation reaction for 1h, then drop the remaining 2 / 3 monomer solution I and 2 / 3 initiator solution I...

Embodiment 2

[0026] ①Acrylamide 10.65g (0.15mol), N-methylolacrylamide 20.2g (0.2mol), acryloyloxyethyltrimethylammonium chloride 29.94g (solid content 81%, 0.125mol), acrylic acid 1.08g (0.015mol), 2-acrylamido-2-methylpropanesulfonic acid 1.04g (0.005mol), glycidyl methacrylate 0.0071g (0.5×10 -4 mol), 0.215g (0.0025mol) of methyl acrylate, 0.285g (0.0025mol) of ethyl methacrylate, and 120g of deionized water were mixed evenly to obtain monomer solution I, and an appropriate amount of dilute sulfuric acid was added to adjust the pH value of monomer solution I is 4;

[0027] ②Mix 1.43g of ammonium persulfate and 85g of deionized water evenly to obtain initiator solution II;

[0028] ③Put 1 / 3 of the monomer solution I and 199g of deionized water into a four-necked flask equipped with a reflux condenser, an air guide tube, and a thermometer, and heat up to 70°C after passing through nitrogen, and add 1 / 3 of the initiator into the system Solution II, keep warm for 1.5h, then add the remain...

Embodiment 3

[0030] ① 7.1g (0.1mol) of acrylamide, 30.3g (0.3mol) of N-methylolacrylamide, 5.57g (solid content 84%, 0.0225mol) of methacryloyloxyethyltrimethylammonium chloride , Dimethylaminoethyl methacrylate 3.53g (0.0225mol), diallyldimethylammonium chloride 11.22g (solid content 65%, 0.045mol), itaconic acid 0.975g (0.0075mol), Methylenebisacrylamide 0.019g (1.25×10 -4 mol), 0.11g (0.00083mol) of butyl acrylate, 0.17g (0.00167mol) of methyl methacrylate, and 45g of deionized water were mixed evenly to obtain monomer solution I, and an appropriate amount of dilute sulfuric acid was added to adjust the pH value of monomer solution I is 3.5;

[0031] ②Mix 0.54g potassium persulfate and 60g deionized water evenly to obtain initiator solution II;

[0032] ③Put 1 / 3 of the monomer solution I and 109g of deionized water into a four-necked flask equipped with a reflux condenser, an air guide tube, and a thermometer, and heat up to 75°C after passing through nitrogen, and add 1 / 3 of the init...

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Abstract

The invention discloses a preparation method for a papermaking dry-strength agent with temporary wet-strength improving effect. Conventional hydroformylated polyacrylamide dry-strength agents are normally prepared by preparing cationic polyacrylamide at first and then carrying out hydroformylation by using glyoxal, wherein the process of hydroformylation is difficult to control, and gelation occurs if control is improper. The preparation method provided by the invention employs N-methylolacrylamide as a main monomer and subjects N-methylolacrylamide, acrylamide, cationic monomer and anionic monomer to free radical solution copolymerization so as to prepare the papermaking dry-strength agent with a macromolecular chain containing a great number of active hydroxymethyl groups. The papermaking dry-strength agent prepared in the invention has the advantages of easiness in adherence and adsorption, effective resistance to interference by anionic garbage, high dry-strength improving effect on paper and certain temporary wet-strength improving effect on the paper. The papermaking dry-strength agent is simple to synthesize, does not contain organochlorine, is friendly to environment and has good storage stability.

Description

technical field [0001] The invention belongs to the field of macromolecule chemistry, in particular to a preparation method of a paper-making dry strength agent with temporary humidification strength. Background technique [0002] Paper is mainly composed of paper fibers through a network structure, and paper has a layered structure. In the plane, paper fibers are interlaced and arranged randomly, and paper also has a pore structure. Therefore, although the strength of paper is affected by many factors, the most important reason is the bonding force between paper fibers. If the paper contains a large amount of unbound short fibers, the strength of the paper will decrease significantly, which will not only affect the performance and quality of the paper, but also affect the running performance of the paper machine and reduce the production efficiency. Especially in the case of the use of paper-making fillers, this effect is more significant. Therefore, in the production pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/58C08F226/02C08F220/34C08F220/56C08F220/06C08F220/18C08F222/14C08F228/02C08F222/06D21H21/18
CPCD21H21/18C08F220/34C08F220/56C08F220/58C08F220/06C08F220/585C08F220/18C08F220/14C08F220/325C08F226/02C08F222/02C08F220/1804C08F228/02C08F222/06C08F220/281C08F222/14
Inventor 牟静梁福根王胜鹏刘钦漆智鹏陆林光谢占豪姜莉
Owner ZHEJIANG TRANSFAR WHYYON CHEM
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