Method for improving brightness of attapulgite

A technology of attapulgite and nano-attapulgite, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as high product cost, environmental pollution, and inability to prepare rutile titanium dioxide, and achieve safety High, wide application field, cost-saving effect

Active Publication Date: 2009-05-06
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method needs to add a large amount of oxalic acid, tartaric acid or citric acid as a compounding agent, which will cause higher product costs and pollute the environment.
In addition, the crystal form of titanium dioxide synthesized by this method is anatase structure, and rutile titanium dioxide cannot be prepared. Because rutile titanium dioxide has good light stability (weather resistance), it has greater application value than anatase titanium dioxide.

Method used

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  • Method for improving brightness of attapulgite
  • Method for improving brightness of attapulgite

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preparation example Construction

[0019] In the invention, firstly, the attapulgite is dispersed in the water phase to prepare the nano attapulgite aqueous dispersion. Then titanium tetrachloride (TiCl 4 ) as a raw material to prepare nano-titanium dioxide aggregates with high hiding power, and compound the nano-titanium dioxide aggregates with nano-attapulgite. The hydrochloric acid produced by the hydrolysis of titanium tetrachloride in the reaction process is used to dissolve the iron element in the attapulgite, and then sodium oxalate is used to complex and remove iron, so that chemical iron removal and surface chemical compounding have a synergistic effect to jointly improve the unevenness The purpose of stick clay whiteness. The concrete steps of above-mentioned preparation method are as follows:

[0020] 1. For methods of dispersing and purifying attapulgite and preparing nano-attapulgite water dispersion, please refer to US Patents US6130179, US6444601 and Chinese Patents CN1248984C, CN101224892A, CN...

Embodiment 1

[0028] Add attapulgite with a whiteness of 65 to deionized water, add sodium hexametaphosphate accounting for 3% of the mass of attapulgite, and stir at high speed for 2 hours with an ME-100 emulsifier (produced by Sino-US joint venture Nantong Ross Mixing Equipment Co., Ltd.) , Stand still for 5 days (ie 120 hours). Impurities and undispersed attapulgite aggregates at the bottom of the deposition are removed to obtain a nano attapulgite aqueous dispersion with a mass ratio of m (attapulgite):m (water)=1:10. Measure 75mL of 1mol / L NaOH solution into a 2000mL three-necked flask, and slowly add 1mol / L TiCl dropwise while stirring 4 Aqueous solution 75mL, control the reaction temperature at 10°C. TiCl 4 After the aqueous solution was added dropwise, the temperature was raised to 85°C, and 1320g of nano-attapulgite aqueous dispersion was added into a three-necked flask, stirred and kept at 85°C for 2 hours, then suction filtered and washed until the pH of the filtrate = 1.0, and...

Embodiment 2

[0030] Add attapulgite with a whiteness of 65 into deionized water, add sodium pyrophosphate accounting for 2% of the mass of attapulgite, and stir at a high speed for 2 hours with an ME-100 emulsifier (produced by Sino-US joint venture Nantong Ross Mixing Equipment Co., Ltd.), Stand for 5 days (120h). Impurities at the bottom of the deposition and undispersed attapulgite aggregates are removed to obtain a nano attapulgite aqueous dispersion with a mass ratio of m(attapulgite):m(water)=1:10. Measure 150mL of 1.5mol / L ammonia solution into a 2000mL three-necked flask, and slowly add 3mol / L TiCl dropwise while stirring 4 Aqueous solution 75mL, control the reaction temperature at 30°C. TiCl 4 After the aqueous solution was added dropwise, the temperature was raised to 80°C, and 1320g of nano-attapulgite aqueous dispersion was added into a three-necked flask, stirred and kept at 80°C for 2 hours, then suction filtered and washed until the pH of the filtrate = 1.0, and the obtain...

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Abstract

The invention discloses a method for improving whiteness of attapulgite. Firstly, natural attapulgite is subjected to dispersion treatment in water phase to prepare an aqueous dispersion solution of the nanometer attapulgite; TiCl4 is used as a raw material to prepare a nanometer titania congeries; secondly, the nanometer titania congeries and the nanometer attapulgite are compounded; an iron element in the attapulgite is dissolved out through utilizing hydrochloric acid produced by the hydrolysis of titanium tetrachloride in the reaction process; and finally, sodium oxalate is used for complexation so as to remove iron. The method is simple and feasible, completes the treatment of the whole process in low temperature, does not need high-temperature heat treatment, does not need to add extra hydrochloric acid, saves cost and reduces environmental pollution; the method utilizes a chemical iron removing method of acid dipping and complexation, is combined with the function of chemical compounding on the surface of titania to whiten synergistically, thereby remarkably improving the whiteness of the attapulgite; and the method can conveniently prepare a titania / attapulgite composite material with different crystal forms through controlling process condition.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide / attapulgite composite material, in particular to a method for synergistically whitening attapulgite by sodium oxalate iron removal and titanium dioxide modification. Background technique [0002] Attapulgite, also known as attapulgite and palygorskite, is a layer-chain structure of hydrous magnesium-aluminosilicate clay minerals. The basic structural unit of attapulgite is rod crystal, which is fibrous and 0.5 in length. ~5μm, diameter 0.02~0.04μm, belonging to natural one-dimensional nanomaterials, with good adsorption, colloid and reinforcement. Since natural attapulgite minerals often contain various impurities, among which iron is the main factor affecting whiteness, the promotion and application of attapulgite in high-end products is greatly restricted. [0003] In order to improve the whiteness of attapulgite, Chinese patent CN1884207A proposes a compound iron removal and whiteni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/06
Inventor 姚超方志成陈志刚吴凤芹丁永红李为民王茂华
Owner 溧阳常大技术转移中心有限公司
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