Wet strength agent, and preparation method and application of wet strength agent

A technology of wet strength agent and catalyst, which is applied in the direction of enhancer addition, etc., can solve the problems of no significant improvement in the effect of humidification strength, improve retention performance, solve problems of excessively high cationic charge density, prevent swelling and water absorption Effect

Active Publication Date: 2015-06-17
九洲生物技术(苏州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Fu Xiaolong et al. used maleic anhydride instead of 20% adipic acid to prepare an unsaturated wet strength agent with a content of 25% ("China Paper" 2013, Volume 32, Issue 7), although a double bond was introduced in the molecular chain, However, no further modification treatment has been done, and the product’s humidification effect has not been significantly improved.

Method used

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  • Wet strength agent, and preparation method and application of wet strength agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) In a 500ml four-necked flask with a stirrer, a thermometer and a reflux condenser, add successively a 40% linear polyacrylic acid aqueous solution (the molecular weight of the linear polyacrylic acid is 1850, and the addition amount is 0.0025mol), diethylenetriamine 0.425mol, 0.5g of 50% sulfuric acid, heated up to 135°C, and kept for 1 hour to synthesize a polyamide polyamine prepolymer A with a comb structure; add 0.36mol of adipic acid, Malay Acid anhydride 0.043mol, heat up to 175°C, keep warm for 6 hours, add deionized water, dilute the polyamide polyamine to a solid content of 50%, and obtain a wet strength agent intermediate solution B with a viscosity of 405mPa.s (25°C) ;

[0044] (2) Transfer the above-mentioned wet strength agent intermediate B to a 1-liter four-neck flask, add deionized water to adjust the solid content to 30%, raise the temperature to 35°C, and add 24 g of ammonium persulfate aqueous solution with a concentration of 1% at the same time, 8...

Embodiment 2

[0047] (1) in the 500ml four-neck flask that has stirrer, thermometer and reflux condenser, add content successively and be the linear polymaleic acid aqueous solution of 50% (the molecular weight of linear polymaleic acid is 1050, and addition is 0.005mol), 0.425mol of diethylenetriamine, 1.0g of p-toluenesulfonic acid, heated up to 140°C, and kept the temperature for 0.5 hours to synthesize a polyamide polyamine prepolymer A with a comb structure; Formic acid 0.315mol, itaconic acid 0.098mol, heat up to 180°C, heat preservation reaction for 5 hours, add deionized water, dilute the polyamide polyamine to a solid content of 50%, and obtain a wet solution with a viscosity of 380mPa.s (25°C). Strong agent intermediate solution B;

[0048] (2) Transfer the above-mentioned wet strength agent intermediate B to a 1-liter four-neck flask, add deionized water to adjust the solid content to 30%, raise the temperature to 40°C, and add 24 g of ammonium persulfate aqueous solution with a ...

Embodiment 3

[0051] (1) in the 500ml four-neck flask that has stirrer, thermometer and reflux condenser, add content successively and be the linear polyitaconic acid aqueous solution of 50% (the molecular weight of linear polyitaconic acid is 625, and addition is 0.01mol), 0.285mol of triethylenetetramine, 0.15mol of hexamethylenediamine, 2.0g of dodecylbenzenesulfonic acid, heating up to 130°C, and keeping the temperature for 1 hour to synthesize polyamide polyamine prepolymer A with a comb structure; Add 0.35 mol of sebacic acid and 0.075 mol of fumaric acid to prepolymer A, raise the temperature to 160°C, keep it warm for 9 hours, add deionized water, dilute the polyamide polyamine to a solid content of 50%, and obtain a viscosity of 550mPa .s (25°C) wet strength agent intermediate solution B;

[0052] (2) Transfer the above-mentioned wet strength agent intermediate B to a 1-liter four-necked flask, add deionized water to adjust the solid content to 30%, raise the temperature to 38° C.,...

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Abstract

The invention relates to a wet strength agent, and a preparation method and an application of the wet strength agent. The preparation method comprises the steps of allowing polycarboxylic acid and polyamine to react for 0.5-2h at 100-140 DEG C in the presence of a catalyst to form a polyamide polyamine prepolymer, adding dicarboxylic acid into the polyamide polyamine prepolymer for reaction for 4-10h at 150-190 DEG C to form a wet strength agent intermediate, adding a crosslinking monomer and an initiator at 30-50 DEG C for reaction for 0.5-1h at 50-60 DEG C to form a polymer, cooling the polymer to 30-35 DEG C, adding epoxy chloropropane, heating up to 60-80 DEG C for reaction for 2-6h, and adjusting pH (potential of hydrogen) of a reaction system to be 2-4 to form the wet strength agent. The wet strength agent has multiple branches, high molecular weight, balanced negative and positive charge distribution, high retention rate and high curing speed.

Description

technical field [0001] The invention belongs to the field of papermaking chemicals, and in particular relates to a wet strength agent, its preparation method and application. Background technique [0002] The wet strength of paper refers to the strength of a paper sheet when exposed to water or in a humid environment. Many paper products require high wet strength, and the addition of wet strength agents can improve the wet strength of paper under conditions such as wetting. [0003] Wet strength agents first used urea-formaldehyde resin (UF) and melamine-formaldehyde resin (MF) resin. Because they contain a lot of formaldehyde and need to be in an acidic system to have a better wet strength effect, they have been basically eliminated. At present, the most widely used wet strength agent is polyamide polyamine epichlorohydrin (PAE or PPE) resin, which can obtain good wet strength effect in medium-alkaline system, and does not contain formaldehyde and is non-toxic. , can be a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/04C08F220/32C08F216/14C08F8/02D21H21/20
Inventor 詹新岭封玉凤
Owner 九洲生物技术(苏州)有限公司
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