CN109776757B - Preparation method and application of benzophenone-containing paper surface polyurethane fluorescent whitening emulsion - Google Patents
Preparation method and application of benzophenone-containing paper surface polyurethane fluorescent whitening emulsion Download PDFInfo
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Abstract
A preparation method of benzophenone-containing paper surface polyurethane fluorescent whitening emulsion and application thereof are disclosed, cyanuric chloride and acetone are placed into a three-neck flask to be stirred, 4 '-diaminostilbene-2, 2' -disulfonic acid is weighed to be dissolved in an alkaline solution of NaOH to react, 2, 4-dihydroxy-benzophenone is added to react, monoethanolamine is added to react after heating, and benzophenone-containing stilbene type fluorescent whitening micromolecules are obtained. Adding isophorone diisocyanate, polyether diol and a small amount of dibutyltin dilaurate into a three-necked bottle which is provided with a condenser pipe and an electric stirrer, placing the three-necked bottle into a constant-temperature water bath, dissolving 2, 2-dimethylolpropionic acid and diphenylethylene type fluorescent whitening micromolecules containing benzophenone into an organic solvent in advance, adding the three-necked bottle into the organic solvent, adding 1, 4-butanediol after reaction, continuing to react and cool, stirring with acetone to reduce viscosity, adding triethylamine for neutralization, adding water for stirring, and evaporating out acetone under reduced pressure.
Description
Technical Field
The invention belongs to the field of polyurethane fluorescent whitening emulsion, and particularly relates to a preparation method and application of benzophenone-containing polyurethane fluorescent whitening emulsion on the surface of paper.
Background
Fluorescent whitening agents, also known as white dyes, can improve the whiteness and gloss of substances and are widely used in textile, printing and dyeing, papermaking, plastics and decorative materials. The brightening and brightening effect of the fluorescent whitening agent on the color of a substance is a physical effect, and high-intensity blue light is emitted in a visible light wave band by absorbing invisible light in a near ultraviolet wave band in sunlight, so that the blue defect in reflected light of a white object with yellow light is compensated, the reflected light intensity of the blue wave band is increased, the whiteness and the brightness of the white object are obviously improved, and the color of a colored object is brighter and more beautiful.
In order to improve the whitening and yellowing inhibition effects of the stilbene fluorescent whitening agent, an ultraviolet absorbent 2, 4-dihydroxy benzophenone is introduced, the ultraviolet absorbent is used for absorbing partial ultraviolet light to achieve the purpose of improving the performance of the stilbene fluorescent whitening agent, although the whitening effect is very obvious, the application is limited due to poor water solubility and difficult sizing.
Disclosure of Invention
The invention aims to provide a preparation method and application of benzophenone-containing paper surface polyurethane fluorescent whitening emulsion, and the preparation method and application have the characteristics of simple synthesis process, easily obtained raw materials and suitability for large-scale production.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of benzophenone-containing paper surface polyurethane fluorescent whitening emulsion comprises the following steps;
(1) mixing isophorone diisocyanate (IPDI), polyether glycol and 1-3 drops of catalyst dibutyltin dilaurate, and reacting at 80 ℃;
(2) mixing 2, 2-dimethylolpropionic acid and diphenylethylene type fluorescent whitening micromolecule containing benzophenone with 5-10ml of organic solvent, adding into the mixture (1), and reacting at 80 ℃;
(3) adding 1, 4-butanediol to the step (2) for continuous reaction, cooling to 40 ℃, and adding 10ml of acetone for viscosity reduction;
(4) and (3) adding triethylamine to neutralize, and adding water to emulsify to obtain the waterborne polyurethane fluorescent whitening emulsion.
In the step (1), the molar ratio of isophorone diisocyanate (IPDI) to polyether glycol is 4: (0.5-1.5);
in the step (2), the molar ratio of the 2, 2-dimethylolpropionic acid to the isophorone diisocyanate is (0.5-1) to 4.8, and the molar ratio of the diphenyl ethylene type fluorescent whitening micromolecules containing benzophenone to the 2, 2-dimethylolpropionic acid is (1-3: 5);
in the step (3), the molar ratio of the 1, 4-butanediol to the stilbene type fluorescent whitening micromolecules of the benzophenone is (1: 1);
in the step (4), the molar ratio of the 2, 2-dimethylolpropionic acid to the triethylamine to the water is 1:1 (350-600).
The preparation method of the stilbene fluorescent whitening micromolecules containing benzophenone in the step (2) is as follows:
5.126g of cyanuric chloride and 40ml of acetone are put into a three-neck flask, stirred for 10min under ice bath to be dispersed evenly, then 5.876g of alkaline solution of 4,4 '-diaminostilbene-2, 2' -disulfonic acid (DSD acid) dissolved in NaOH is weighed to carry out the first step of reaction, the pH value is adjusted to about 5 by 10% NaOH aqueous solution, the reaction temperature is controlled to be 0-5 ℃, the reaction is carried out for 2.5h to be dispersed evenly, 4.67g of 2,4 dihydroxy-benzophenone is added, simultaneously gradually heating to 35-40 ℃, adjusting the pH to 6-7 by using 10% NaOH aqueous solution, reacting for 3 hours, heating to 80-85 ℃, adding 2.57g ethanolamine, adjusting the pH to 8-8.5, reacting for 3 hours, after the reaction is finished, vacuum filtration is carried out, deionized water is used for washing, drying is carried out at 40 ℃ until the weight is constant, the yield is 78%, and a product is stored in a dryer, wherein the structural formula of the product is as follows:
the molecular weight of the polyether glycol in the step (1) may be 500, 700 or 1000.
The organic solvent in the step (2) can be acetone, N-methyl pyrrolidone and toluene.
The reaction time in the step (1) is 2-3 h.
The reaction time in the step (2) is 3-4 h.
The emulsifying time in the step (4) is 0.5-2.5 h.
The waterborne polyurethane fluorescent whitening emulsion is applied to successive polyurethane emulsion and surface sizing of high-yield cultural paper, so that the paper has good yellowing inhibition and sizing effects.
The invention has the beneficial effects that:
the invention has the advantages that the whitening effect of the diphenyl ethylene fluorescent whitening agent is improved, the surface strength of paper is enhanced, and the three functions of inhibiting paper yellowing are combined together, and from the perspective of molecular design, diphenyl ethylene type fluorescent whitening micromolecules containing benzophenone are connected in a polyurethane chain to form novel fluorescent whitening polyurethane emulsion. The synthesis temperature of the method is below 100 ℃, the operation is simple and convenient, and the energy is saved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1
Adding 0.024mol of isophorone diisocyanate, 0.003mol of polyether glycol (M is 500) and 1 drop of dibutyltin dilaurate into a 100ml three-necked bottle which is provided with a condenser tube and an electric stirrer, then placing the bottle in a constant-temperature water bath at 80 ℃ for reaction for 2h, dissolving 0.004mol of 2, 2-dimethylolpropionic acid and 0.0016mol of diphenyl ethylene type fluorescence whitening micromolecule containing benzophenone in 10ml of acetone in advance, adding the dissolved molecules into the three-necked bottle, reacting for 4h, adding 0.0016mol of 1, 4-butanediol for continuous reaction, increasing the emulsion viscosity, cooling to 40 ℃ after reacting for 1h, stirring with 10ml of acetone for viscosity reduction, adding 0.004mol of triethylamine for neutralization, adding 76.8g of water for stirring for 30min, and evaporating the acetone under reduced pressure to obtain the waterborne polyurethane fluorescence whitening emulsion.
Example 2
Adding 0.024mol of isophorone diisocyanate, 0.006mol of polyether glycol (M is 700) and 2 drops of dibutyltin dilaurate into a 100ml three-necked bottle provided with a condenser tube and an electric stirrer, then placing the bottle in a constant-temperature water bath at 80 ℃ for reaction for 3h, then dissolving 0.0048mol of 2, 2-dimethylolpropionic acid and 0.00288mol of diphenyl ketone-containing stilbene type fluorescence whitening micromolecule in 5ml of N-methyl pyrrolidone in advance, adding the mixture into the three-necked bottle, adding 0.00288mol of 1, 4-butanediol for continuous reaction after 3h reaction to increase the emulsion viscosity, cooling to 40 ℃ after 2h reaction, stirring with 10ml of acetone to reduce the viscosity, adding 0.0048mol of triethylamine for neutralization, adding 53.76g of water, stirring for 1.5h, and evaporating the acetone under reduced pressure to obtain the aqueous polyurethane fluorescence whitening emulsion.
Example 3
Adding 0.024mol of isophorone diisocyanate, 0.009mol of polyether glycol (M is 1000) and 3 drops of dibutyltin dilaurate into a 100ml three-neck flask which is provided with a condenser tube and an electric stirrer, then placing the flask into a constant-temperature water bath at 80 ℃ for reaction for 2.5h, dissolving 0.0025mol of 2, 2-dimethylolpropionic acid and 0.0005mol of diphenyl ethylene type fluorescence whitening micromolecule containing benzophenone in 10ml of acetone in advance, adding the mixture into the three-neck flask, after the reaction is carried out for 3.5h, adding 0.0005mol of 1, 4-butanediol for continuous reaction to increase the emulsion viscosity, after the reaction is carried out for 2h, cooling to 40 ℃, stirring with 10ml of acetone for viscosity reduction, adding 0.0025mol of triethylamine for neutralization, adding 40g of water for stirring for 1.5h, and distilling off the acetone under reduced pressure to obtain the aqueous polyurethane fluorescence whitening emulsion.
Example 4
Adding 0.024mol of isophorone diisocyanate, 0.006mol of polyether glycol (M is 1000) and 2 drops of dibutyltin dilaurate into a 100ml three-necked bottle provided with a condenser tube and an electric stirrer, then placing the bottle in a constant-temperature water bath at 80 ℃ for reaction for 2h, dissolving 0.0048mol of 2, 2-dimethylolpropionic acid and 0.0024mol of diphenyl ethylene type fluorescence whitening micromolecule containing benzophenone in 7.5ml of toluene in advance, adding the dissolved solution into the three-necked bottle, after the reaction for 4h, adding 0.0024mol of 1, 4-butanediol for continuous reaction to increase the emulsion viscosity, after the reaction for 2h, cooling to 40 ℃, stirring with 10ml of acetone for viscosity reduction, adding 0.0048mol of triethylamine for neutralization, then adding 60g of water for stirring for 1h, and evaporating the acetone under reduced pressure to obtain the waterborne polyurethane fluorescence whitening emulsion.
Example 5
Adding 0.024mol of isophorone diisocyanate, 0.003mol of polyether glycol (M is 700) and 3 drops of dibutyltin dilaurate into a 100ml three-necked bottle which is provided with a condenser tube and an electric stirrer, then placing the bottle in a constant-temperature water bath at 80 ℃ for reaction for 2h, dissolving 0.004mol of 2, 2-dimethylolpropionic acid and 0.0024mol of diphenyl ethylene type fluorescence whitening micromolecule containing benzophenone in 7ml of toluene in advance, adding the dissolved molecules into the three-necked bottle, adding 0.0024mol of 1, 4-butanediol for continuous reaction after 3h reaction, increasing the emulsion viscosity, cooling to 40 ℃ after 2h reaction, stirring with 10ml of acetone for viscosity reduction, adding 0.004mol of triethylamine for neutralization, adding 50g of water for stirring for 2.5h, and evaporating the acetone under reduced pressure to obtain the waterborne polyurethane fluorescence whitening emulsion.
The invention aims to prepare the polyurethane fluorescent whitening agent emulsion which has good water-based property, good paper-binding property, yellowing resistance and paper tension resistance improvement by taking the diphenyl ethylene type fluorescent whitening micromolecule containing benzophenone as a chain extender and connecting the diphenyl ethylene type fluorescent whitening micromolecules in the polyurethane emulsion.
Claims (8)
1. A preparation method of benzophenone-containing paper surface polyurethane fluorescent whitening emulsion is characterized by comprising the following steps;
(1) mixing isophorone diisocyanate (IPDI), polyether glycol and 1-3 drops of catalyst dibutyltin dilaurate, and reacting at 80 ℃;
(2) mixing 2, 2-dimethylolpropionic acid and diphenylethylene type fluorescent whitening micromolecule containing benzophenone with 5-10ml of organic solvent, adding into the mixture (1), and reacting at 80 ℃;
(3) adding 1, 4-butanediol to the step (2) for continuous reaction, cooling to 40 ℃, and adding 10ml of acetone for viscosity reduction;
(4) adding triethylamine to neutralize in the step (3), and adding water for emulsification to obtain the waterborne polyurethane fluorescent whitening emulsion;
the preparation method of the stilbene fluorescent whitening micromolecules containing benzophenone in the step (2) is as follows:
5.126g of cyanuric chloride and 40ml of acetone are put into a three-neck flask, stirred for 10min under ice bath to be dispersed evenly, then 5.876g of alkaline solution of 4,4 '-diaminostilbene-2, 2' -disulfonic acid (DSD acid) dissolved in NaOH is weighed to carry out the first step of reaction, the pH value is adjusted to about 5 by 10% NaOH aqueous solution, the reaction temperature is controlled to be 0-5 ℃, the reaction is carried out for 2.5h to be dispersed evenly, 4.67g of 2,4 dihydroxy-benzophenone is added, simultaneously gradually heating to 35-40 ℃, adjusting the pH to 6-7 by using 10% NaOH aqueous solution, reacting for 3 hours, heating to 80-85 ℃, adding 2.57g ethanolamine, adjusting the pH to 8-8.5, reacting for 3 hours, after the reaction is finished, vacuum filtration is carried out, deionized water is used for washing, drying is carried out at 40 ℃ until the weight is constant, the yield is 78%, and a product is stored in a dryer, wherein the structural formula of the product is as follows:
2. the method for preparing the polyurethane fluorescent whitening emulsion on the surface of paper containing benzophenone according to claim 1, wherein in the step (1), the molar ratio of isophorone diisocyanate (IPDI) to polyether glycol is 4: (0.5-1.5);
in the step (2), the molar ratio of the 2, 2-dimethylolpropionic acid to the isophorone diisocyanate is (0.5-1) to 4.8, and the molar ratio of the diphenyl ethylene type fluorescent whitening micromolecules containing benzophenone to the 2, 2-dimethylolpropionic acid is (1-3: 5);
in the step (3), the molar ratio of the 1, 4-butanediol to the stilbene type fluorescent whitening micromolecules of the benzophenone is (1: 1);
in the step (4), the molar ratio of the 2, 2-dimethylolpropionic acid to the triethylamine to the water is 1:1 (350-600).
3. The method for preparing polyurethane fluorescent whitening emulsion for paper surfaces containing benzophenone as claimed in claim 1, wherein the molecular weight of polyether diol in step (1) is 500, 700 or 1000.
4. The method for preparing polyurethane fluorescent whitening emulsion on paper surface containing benzophenone as claimed in claim 1, wherein the organic solvent in step (2) is acetone, N-methyl pyrrolidone, toluene.
5. The method for preparing the polyurethane fluorescent whitening emulsion on the surface of paper containing benzophenone as claimed in claim 1, wherein the reaction time in step (1) is 2-3 h.
6. The method for preparing the polyurethane fluorescent whitening emulsion for the paper surface containing benzophenone as claimed in claim 1, wherein the reaction time in the step (2) is 3-4 h.
7. The method for preparing polyurethane fluorescent whitening emulsion for paper surface containing benzophenone as claimed in claim 1, wherein the emulsifying time in step (4) is 0.5-2.5 h.
8. The use of the benzophenone-containing polyurethane emulsion for the fluorescent whitening of paper surfaces according to any of claims 1 to 7, wherein the aqueous polyurethane emulsion for the fluorescent whitening of paper surfaces is used for the surface sizing of high-yield cultural paper, and the paper has good yellowing inhibition and sizing effects.
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