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Preparation method of fluorescent composite whitened attapulgite

A kind of attapulgite and fluorescent technology, which is applied in the treatment of dyed organosilicon compounds, dyed high-molecular organic compounds, dyed low-molecular organic compounds, etc., can solve problems such as difficult dispersion, improve dispersibility, increase added value, and improve fixed action effect

Inactive Publication Date: 2012-09-19
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 attapulgite, pass through a 200-mesh sieve after crushing, add water to make a dispersion system with a mass concentration of 6%, stir for 1 hour, let stand for 6 hours, take the upper suspension and dehydrate it by centrifugation at 200°C Dry to obtain purified attapulgite with a whiteness of 75.0%;

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

[0021] (3) Composite reaction: take 30g of 60% pentahydroxy-melamine, add 0.9g of fluorescent whitening agent VBL, add 100mL of water and stir until the fluorescent whitening agent is completely dissolved, adjust the pH value ...

Embodiment 2

[0023] (1) Purification of attapulgite: take attapulgite, pass through a 200-mesh sieve after being crushed, add water to make a dispersion system with a mass concentration of 6%, stir for 1 hour, let it stand for 6 hours, take the upper suspension and dehydrate it by centrifugation at 300°C Dry to obtain purified attapulgite with a whiteness of 78.0%;

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

[0025] (3) Composite reaction: take 30g of 60% pentahydroxy-melamine, add 1.8g of fluorescent whitening agent VBL, add 100mL of water and stir until the fluorescent whitening agent is completely dissolved, adjust the pH value...

Embodiment 3

[0027] (1) Purification of attapulgite: Take attapulgite, pass through a 200-mesh sieve after being crushed, add water to make a dispersion system with a mass concentration of 6%, stir for 1 hour, let it stand for 6 hours, take the upper suspension and dehydrate it by centrifugation at 400°C Dry to obtain purified attapulgite with a whiteness of 80.0%;

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

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

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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 compounding, in particular to a method for whitening attapulgite on the surface of modified attapulgite by compounding a fluorescent whitening agent and a polymer. Background technique [0002] Attapulgite is a widely used natural non-metallic mineral. It has a certain color because it contains certain impurities. The purified attapulgite is white. It has been widely used in the fields of daily chemical, polymer synthesis, papermaking, paint, etc. application. Improving the whiteness of attapulgite will help to increase the added value of attapulgite application and expand the application range 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 th...

Claims

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Application Information

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Patent Type & Authority Applications(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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