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Preparation method of fluorescent composite whitened attapulgite

A technology of attapulgite and fluorescence, which is applied in the treatment of dyed organosilicon compounds, dyed high molecular organic compounds, dyed low molecular organic compounds, etc. The effect of added value

Inactive Publication Date: 2013-12-04
HUAIYIN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to disperse in non-polar organic substances and polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Purification of attapulgite: take the attapulgite, smash it through a 200-mesh sieve, add water to prepare a dispersion system with a mass concentration of 6%, stir for 1 hour, stand for 6 hours, take the upper suspension to centrifuge and dehydrate it at 200°C The purified attapulgite obtained by drying has a whiteness of 75.0%;

[0020] (2) Modification of attapulgite: Take 30g of purified attapulgite and add 500mL deionized water to make a dispersion, add 3g of silane coupling agent KH-550 dropwise while stirring, heat to 80°C for 4 hours, filter and wash 6 times to remove The unreacted coupling agent is dried in an oven at 70°C for 4 hours, and then ground through a 325 mesh sieve to obtain the coupling agent modified attapulgite;

[0021] (3) Compound reaction: Take 30g of 60% pentahydroxy-melamine and add 0.9g of fluorescent whitening agent VBL, and add 100mL of water and stir evenly until all the fluorescent whitening agent is dissolved, adjust the pH to 4.0 with ...

Embodiment 2

[0023] (1) Purification of attapulgite: take the attapulgite, smash it through a 200-mesh sieve, add water to form a dispersion system with a mass concentration of 6%, stir for 1 hour, stand still for 6 hours, take the upper suspension for centrifugation and dehydrate it at 300°C The purified attapulgite obtained by drying has a whiteness of 78.0%;

[0024] (2) Modification of attapulgite: Take 30g of purified attapulgite and add 500mL deionized water to prepare a dispersion, add 1.5g of silane coupling agent KH-550 dropwise while stirring, heat to 60℃ for 5 hours, filter, wash 6 times Remove unreacted coupling agent, dry in an oven at 80°C for 3 hours, grind through a 325 mesh sieve to obtain coupling agent modified attapulgite;

[0025] (3) Compound reaction: Take 30g of 60% pentahydroxy-melamine and add 1.8g of fluorescent whitening agent VBL, add 100mL of water and stir evenly until all the fluorescent whitening agent is dissolved, adjust the pH to 3.5 with concentrated hydroch...

Embodiment 3

[0027] (1) Purification of attapulgite: take the attapulgite, smash it through a 200-mesh sieve, add water to prepare a dispersion system with a mass concentration of 6%, stir for 1 hour, stand for 6 hours, take the upper suspension to centrifuge and dehydrate it at 400℃ The purified attapulgite obtained by drying has a whiteness of 80.0%;

[0028] (2) Modification of attapulgite: add 30g of purified attapulgite to 500mL deionized water to prepare a dispersion, add 2.3g of silane coupling agent KH-550 dropwise while stirring, heat to 70°C for 3 hours, filter and wash for 6 times Remove unreacted coupling agent, dry in an oven at 60°C for 5 hours, and grind through a 325 mesh sieve to obtain coupling agent modified attapulgite;

[0029] (3) Compound reaction: Take 30g of 60% pentahydroxy-melamine and add 2.0g of fluorescent whitening agent VBL, and add 100mL of water and stir evenly until the fluorescent whitening agent is completely dissolved, adjust the pH to 4.5 with concentrated...

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Abstract

The invention discloses a preparation method of fluorescent composite whitened attapulgite, which is characterized by comprising the following steps: (1) after pulverizing attapulgite, screening, adding water to prepare a disperse system with a certain concentration, stirring, standing for some time, taking the supernatant suspension, carrying out centrifugal dewatering on the supernatant suspension, and drying at certain temperature to obtain purified attapulgite; (2) preparing the purified attapulgite into a dispersion, dropwisely adding a silane coupling agent while stirring, heating to react for some time, filtering, washing, drying, grinding and screening to obtain modified attapulgite; and (3) carrying out composite reaction on the modified attapulgite with a melamine-formaldehyde polycondensate and a water-soluble fluorescent whitening agent VBL to obtain the fluorescent whitened attapulgite. The attapulgite surface is modified by the silane coupling agent, thereby enhancing the dispersity of the attapulgite and the coupling action with resin; and the compound obtained by reacting the melamine-formaldehyde resin with the fluorescent whitening agent is compounded onto the attapulgite surface under the coupling action, thereby effectively enhancing the fixation action of the fluorescent whitening agent on the attapulgite surface and achieving the effect of whitening the attapulgite.

Description

Technical field [0001] The invention relates to a method for whitening attapulgite by fluorescent composite whitening, in particular to a method for compounding a fluorescent whitening agent and a polymer to the surface whitening attapulgite of modified attapulgite. Background technique [0002] Attapulgite is a widely used natural non-metallic mineral. It shows a certain color due to certain impurities. The purified attapulgite is white. It is widely used in daily chemical, polymer synthesis, papermaking, paint and other fields. application. Increasing the whiteness of attapulgite will help increase the added value of attapulgite applications and expand the scope of application of attapulgite in high-quality products. [0003] In the fluorescent whitening of inorganic substances, the anionic fluorescent whitening agent is usually added by direct stirring method, and the anionic fluorescent whitening agent is attached to the surface of the inorganic substance through adsorption to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/42C09C3/10C09C3/12C09C3/08
Inventor 赵登山冯良东孙永明
Owner HUAIYIN INSTITUTE OF TECHNOLOGY
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