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Preparation method of closed water-based polyurethane modified PAE (polyarylether) wet strength agent

A technology of PAE wet strength agent and water-based polyurethane, which is applied in the direction of reinforcing agent addition, can solve the problems of limited use, and achieve the effects of increased folding resistance, increased wet strength retention rate, and good storage stability

Inactive Publication Date: 2014-01-22
SHANGHAI DONGSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, isocyanate is easy to react with water, which limits its use in papermaking

Method used

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  • Preparation method of closed water-based polyurethane modified PAE (polyarylether) wet strength agent
  • Preparation method of closed water-based polyurethane modified PAE (polyarylether) wet strength agent
  • Preparation method of closed water-based polyurethane modified PAE (polyarylether) wet strength agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of blocked polyurethane prepolymer: put 100g of polybutylene adipate diol (molecular weight: 1000) and 8g of 2,2'-dimethylol propionic acid into a stirring and heating device In a four-neck flask, after vacuum dehydration at 100°C for 1h, add 180g of dry N-methylpyrrolidone and 41.8g of toluene diisocyanate ([NCO] / [OH]=1.5) to react to its NCO at 80°C under the protection of nitrogen. The content reaches the theoretical value, and the polyurethane prepolymer with terminal NCO group is obtained. Then add 7g of methyl ethyl ketoxime and react at 80°C until its NCO content is zero to obtain a blocked polyurethane prepolymer;

[0030] (2), the preparation of PPC: in the four-neck flask that stirring, condensation tube are housed, add 103 grams of diethylenetriamine and 31 grams of deionized water, start stirring, slowly add 146 grams of adipic acid under stirring, make The temperature of the system should not exceed 130°C. Stir for 20 minutes after the addi...

Embodiment 2

[0033] (1) Put 100g of polytetrahydrofuran diol (molecular weight: 1000) and 9.4g of 2,2'-dimethylolpropionic acid into a four-necked flask with a stirring and heating device, dehydrate in vacuum at 100°C for 1 hour, then add 180g of dry N-methylpyrrolidone and 55g of diphenylmethane diisocyanate ([NCO] / [OH]=1.3) were reacted at 80°C under the protection of nitrogen until the NCO content reached the theoretical value to obtain NCO-terminated polyurethane prepolymer . Then add 4.5g of methyl ethyl ketoxime and react at 80°C until its NCO content is zero to obtain a blocked polyurethane prepolymer;

[0034] (2) Preparation of PPC: Add 108 grams of diethylenetriamine and 31 grams of deionized water into a four-necked flask equipped with a stirring and condenser tube, start stirring, and slowly add 146 grams of adipic acid under stirring to make the system The temperature should not exceed 130°C, stir for 20 minutes after the addition is complete, then heat to 180°C with a heatin...

Embodiment 3

[0037] (1) Put 100g of polyneopentyl glycol adipate diol (molecular weight: 2000) and 4.7g of 2,2'-dimethylolpropionic acid into a four-necked flask with a stirring and heating device. After vacuum dehydration at 100°C for 1 h, 170 g of N-methylpyrrolidone and 32 g of isophorone diisocyanate ([NCO] / [OH]=1.7) were added to react at 80°C under the protection of nitrogen until the NCO content reached the theoretical value. NCO based polyurethane prepolymer. Then add 5.2g of methyl ethyl ketoxime and react at 80°C until its NCO content is zero to obtain a blocked polyurethane prepolymer;

[0038](2) Preparation of PPC: Add 108 grams of diethylenetriamine and 31 grams of deionized water into a four-necked flask equipped with a stirring and condenser tube, start stirring, and slowly add 146 grams of adipic acid under stirring to make the system The temperature should not exceed 130°C, stir for 20 minutes after the addition is complete, then heat to 175°C with a heating mantle, and ...

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Abstract

The invention provides a preparation method of a sealed water-based polyurethane modified PAE (polyarylether) wet strength agent, which comprises the following steps: carrying out vacuum dehydration on polyalcohol and carboxylic acid chain extender, adding organic solvent and polyisocyanate, reacting in a nitrogen atmosphere to obtain NCO-terminated polyurethane prepolymer, and adding a closing agent to react until the -NCO content is zero to obtain a closed polyurethane prepolymer; mixing polyethylene polyamine, dibasic acid and catalyst to carry out polycondensation reaction, removing the generated water by distillation, cooling to 120-140 DEG C, and adding hot water to obtain a polyamide-imide solution; and sequentially adding water and the closed polyurethane prepolymer into the polyamide-imide solution, dissolving by stirring, adding epoxy chloropropane to react, adding a terminator when the system viscosity reaches 40-100 cps, and regulating the pH value of the system to 3.0-5.0. Compared with the traditional PAE wet strength agent, after the wet strength agent provided by the invention is applied to paper, the dry tensile index, wet tensile index, wet strength retention and folding strength are enhanced.

Description

technical field [0001] The invention relates to a preparation method of a blocked waterborne polyurethane modified PAE wet strength agent. Background technique [0002] Traditional wet strength agents are mainly acid-cured wet-strength agents represented by urea-formaldehyde resin and melamine resin and medium-alkaline-cured wet-strength agents represented by polyamide epichlorohydrin. It will release a certain amount of formaldehyde, which will pollute the environment, and it needs to be matured at a lower pH value, so it is difficult to recycle broken paper; the water resistance of polyamide epichlorohydrin wet strength agent is not as good as that of melamine formaldehyde resin. The effect on dry strength is not obvious, and the content of organic chlorine is high, which is considered to be a carcinogenic risk. [0003] Isocyanate is a compound containing isocyanate group (-NCO) in the molecule. Its chemical activity is mainly manifested in its characteristic group -NCO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/80C08G18/60C08G18/38C08G18/12D21H21/20
CPCC08G18/12C08G18/2805C08G18/286C08G18/603C08G18/6659C08G18/6692D21H17/57D21H21/20C08G18/65
Inventor 施晓旦李改霞
Owner SHANGHAI DONGSHENG NEW MATERIALS
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