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Enclosed type aqueous polyurethane emulsion papermaking wet strength agent and its preparation method

A water-based polyurethane, closed-type technology, applied in the direction of reinforcing agent addition, etc., can solve problems such as restricted use

Inactive Publication Date: 2012-10-17
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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  • Enclosed type aqueous polyurethane emulsion papermaking wet strength agent and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, put 100g of polybutylene adipate diol (molecular weight: 1000) and 8g of 2,2'-dimethylol propionic acid into a four-necked flask with a stirring and heating device, and vacuum at 100°C After dehydration for 1 h, add 20 g of dry N-methylpyrrolidone and 41.8 g of toluene diisocyanate ([NCO] / [OH]=1.5) and react at 80 °C for 3 h under nitrogen protection until the NCO content reaches the theoretical value, and the terminal NCO based polyurethane prepolymers.

[0024] Then add 7g of methyl ethyl ketoxime and react at 80°C for 3h until the NCO content is zero to obtain a blocked polyurethane prepolymer;

[0025] Add 6g of triethylamine at 55°C for neutralization reaction for 1h, add 325g of deionized water to disperse to obtain the final sample, which is a bluish white emulsion with a viscosity of 9.8mPa.s at 25°C (measured by NDJ-1 rotational viscometer), weight The solid content is 32%, and the pH is 7.5.

Embodiment 2

[0027] First, 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, and after vacuum dehydration at 80°C for 2 hours, add 30g Dry N-methylpyrrolidone and 55g of diphenylmethane diisocyanate ([NCO] / [OH]=1.3) were reacted at 75°C for 4h under the protection of nitrogen until the NCO content reached the theoretical value to obtain NCO-terminated polyurethane prepolymer thing. Then add 4.5g of methyl ethyl ketoxime and react at 75°C for 4h until its NCO content is zero to obtain a blocked polyurethane prepolymer, add 7g of triethylamine at 65°C for neutralization reaction for 0.5h, add 400g of deionized water, and disperse The final sample obtained was a bluish white emulsion with a viscosity of 39.8 mPa.s at 25°C (measured by NDJ-1 rotational viscometer), a weight solid content of 29%, and a pH of 7.7.

Embodiment 3

[0029] First, put 100g polyneopentyl glycol adipate diol (molecular weight: 2000) and 4.7g 2,2'-dimethylolpropionic acid into a four-necked flask with a stirring and heating device, at 100 After vacuum dehydration at ℃ for 1 h, add 15 g of N-methylpyrrolidone and 32 g of isophorone diisocyanate ([NCO] / [OH]=1.7) and react for 5 h at 85 °C under the protection of nitrogen until the NCO content reaches the theoretical value. NCO-terminated polyurethane prepolymer. Then add 5.2g of methyl ethyl ketone oxime and react at 80°C for 6h until its NCO content is zero to obtain a blocked polyurethane prepolymer, add 6g of triethylamine at 60°C for neutralization reaction for 0.5h, add 350g of deionized water for dispersion The final sample obtained was a bluish white emulsion with a viscosity of 20.5 mPa.s at 25°C (measured by NDJ-1 rotational viscometer), a weight solid content of 29.4%, and a pH of 7.4.

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Abstract

The invention discloses an enclosed type aqueous polyurethane emulsion papermaking wet strength agent and its preparation method. The preparation method comprises the following steps of: (1) dehydrating polyol and a carboxylic acid type chain extender; (2)adding an organic solvent and polyisocyanates, reacting in a nitrogen atmosphere at 70-100 DEG C until the content of NCO in the solution reaches a theoretical value, so as to obtain a -NCO-terminated polyurethane prepolymer; (3) adding a blocking agent and reacting at 75-85 DEG C until the NCO content is zero, so as to obtain an enclosed type polyurethane prepolymer. and (4) adding triethylamine at 55-65 DEG C to conduct a neutralization reaction for 0.5-1h, adding water, and stirring to disperse to obtain the enclosed type aqueous polyurethane emulsion papermaking wet strength agent. According to the invention, deblocking can be realized at high temperature, and wet and dry strength of paper can be raised by the utilization of reactions between isocyanate and hydroxyl, amino and the like in fiber.

Description

technical field [0001] The invention relates to a water-based polyurethane emulsion papermaking wet strength agent and a preparation method thereof. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/48C08G18/42C08G18/34C08G18/12D21H21/20
Inventor 施晓旦郑昌堪
Owner SHANGHAI DONGSHENG NEW MATERIALS
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