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Preparation method and application for papermaking dry strength agent

A dry strength agent and reactor technology, used in papermaking, reinforcing agent addition, textiles and papermaking, etc., can solve the problems of gelation, high local concentration, local explosion, etc., to avoid environmental pollution and overcome product viscosity. , to avoid the effect of explosion and gelation

Active Publication Date: 2014-03-26
山东奥赛新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are some defects in these two methods: the method of adding raw materials at one time, due to the high concentration of reactants, is easy to produce implosion polymerization and then gelation effect; The concentration of the polymer is lowered, and then the added monomer continues to react in the solution of these polymers, so that the monomer concentration can be kept at a low level to prevent implosion, but when the polymer solution reaches a certain viscosity, the latter is added The monomers and initiators in the system cannot be stirred evenly into the system in time, resulting in excessive local concentration, resulting in local detonation and gelation, which is also a problem that needs to be solved

Method used

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  • Preparation method and application for papermaking dry strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Add 480kg of isopropanol and 200kg of deionized water into the reactor, stir and mix evenly, and heat up to 80-85°C;

[0034] (2) Mix 27kg of acrylic acid, 2.0kg of methyl acrylate, and 0.5kg of itaconic acid evenly to obtain dropwise solution A1; mix 120kg of acrylamide, 13kg of acrylic acid, 1.8kg of N,N-dimethylacrylamide, 25kg of DMC, 13kg acrylonitrile and 15kg deionized water were uniformly mixed to obtain drip solution A2; 0.46kg sodium persulfate and 50kg deionized water were uniformly mixed to obtain drip solution B1; 1kg sodium persulfate and 50kg deionized water were uniformly mixed to obtain Obtain dropwise solution B2;

[0035] (3) At 80-85°C, add dropwise liquids A1 and B1 to the above-mentioned reactor at a constant speed at the same time. After the polymerization reaction occurs for 1.5 hours, cool down to 35-45°C, and adjust the pH to 4-6 with NaOH , and then raise the temperature to 80-85°C, then drop the dripping solution A2 and B2 into the react...

Embodiment 2

[0038] (1) Add 600kg of n-butanol and 80kg of deionized water into the reactor, stir and mix evenly, and heat up to 80-85°C;

[0039](2) Mix 26kg of acrylic acid, 2.5kg of hydroxyethyl acrylate, 0.5kg of methyl methacrylate, and 1kg of DM evenly to obtain dropwise solution A1; mix 125kg of acrylamide, 15kg of acrylic acid, 1kg of N,N-dimethylacrylamide , 1kg maleic anhydride, 28kgDM, and 18kg deionized water were uniformly mixed to obtain dropwise solution A2; 2.5kg hydrogen peroxide (30% effective content) and 48kg deionized water were uniformly mixed to obtain dropwise solution B1; 1.5kg Mix hydrogen peroxide (effective content 30%) and 50kg deionized water evenly to obtain drip solution B2;

[0040] (3) At 80-85°C, drop the dripping solution A1 and B1 into the above-mentioned reactor at the same time at a constant speed, after the polymerization reaction occurs for 2 hours, cool down to 35-45°C, and adjust the pH to 4-6 with NaOH , and then raise the temperature to 80-85°C...

Embodiment 3

[0043] (1) Add 500kg of ethanol and 180kg of deionized water into the reactor, stir and mix evenly, and heat up to 80-85°C;

[0044] (2) Mix 30kg of acrylic acid, 2.5kg of hydroxypropyl acrylate, 0.5kg of ethyl acrylate, and 2kg of DADMAC evenly to obtain dropwise solution A1; mix 147kg of acrylamide, 19kg of Amide, 1.5kg sodium methacrylate, and 19kg deionized water were uniformly mixed to obtain drip solution A2; 0.46kg ammonium persulfate and 50kg deionized water were uniformly mixed to obtain drip solution B1; 0.6kg benzene peroxide Formyl and 50kg of deionized water were evenly mixed to obtain dropwise solution B2;

[0045] (3) At 80-85°C, drop the dripping solution A1 and B1 into the above-mentioned reactor at the same time at a constant speed, after the polymerization reaction occurs for 2 hours, cool down to 35-45°C, and adjust the pH to 4-6 with NaOH , and then raise the temperature to 80-85°C, then add the dripping solution A2 and B2 into the reactor at a constant s...

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Abstract

The invention relates to a preparation method for a papermaking dry strength agent. The preparation method comprises the following steps: (1) adding alcohol and water into a reactor, and heating to 80-85 DEG C; (2) preparing a dripping liquid A1 with acrylic monomer, acrylate monomer and comonomer X, preparing a dripping liquid A2 with acrylamide monomer, residual acrylic monomer and comonomer Y, and mixing an oxidizing agent and deionized water respectively to prepare dripping liquids B1 and B2; (3) adding the dripping liquids A1 and B1 into the reactor, cooling after polymerization, adjusting pH to 4-6, heating to 80-85 DEG C, and adding the dripping liquids A2 and B2 into the reactor to continue polymerization, heating to distill off alcohol after the reaction is completed, and finally, cooling, supplementing deionized water and discharging. According to the method, reaction products effectively avoid the phenomena of local implosion and gelatinization under the dilution effect of an alcohol-water system and the dispersion effect of a dispersing agent prepared by earlier reaction so as to synthesize the dry strength agent with moderate molecular weight, branching coefficient and viscosity step by step.

Description

technical field [0001] The invention belongs to the technical field of paper strengthening agents, and in particular relates to a preparation method and application of a dry strength agent for papermaking. Background technique [0002] Dry strength agent is an important class of chemicals in the paper industry to enhance the strength of paper, and is usually used to compensate for the decrease in paper strength caused by adding fillers or low-grade fibers (such as recycled fibers). Many water-soluble polymers that can form hydrogen bonds with fibers can be used as dry strength agents. [0003] Commonly used dry strength agents include natural polymers such as starch and its modified products (cationic starch, anionic starch, cross-linked starch), synthetic polymers such as polyacrylamide, polyvinyl alcohol, and other water-soluble natural products. Agents (such as guar gum and its derivatives, etc.). In most cases, effective dry strength can be achieved by heating only 0.1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/48C08F220/14C08F220/28C08F220/18C08F222/06C08F228/02C08F222/02C08F2/10D21H17/45D21H17/43D21H21/18
Inventor 谢鹏
Owner 山东奥赛新材料有限公司
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