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Coatings

A coating and coating technology, used in the field of removing polluting gases, can solve problems such as weight loss, and achieve the effect of small impact on integrity and appearance

Active Publication Date: 2018-11-23
VENATOR MATERIALS UK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Likewise, for exterior paints, a significant weight loss usually occurs after weathering as titanium dioxide breaks down the paint's polymer binder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0142] Example 1 - Preparation of Mesoporous Titanium Dioxide Particles

[0143] Mesoporous titanium dioxide particles were obtained according to the method described in WO2015 / 040426.

[0144]In this case, the slurry from the sulfate process is neutralized and washed to remove sulfate. HCl was added to peptize the slurry and citric acid was added to change the isoelectric point. Monoisopropanolamine was then added to raise the pH to about 7, at which point a clear sol was observed to have formed. The clear neutral sols are spray dried under controlled conditions. Specifically, the concentrated sol was fed into a spray dryer using a Lab Plant Super 7 laboratory spray dryer under the condition of a solid content of 17 wt% at 110° C. to prepare mesoporous titania particles.

[0145] Mesoporous titania particles were treated to remove citric acid. The treatment consists of one of two methods: (a) calcination at a temperature of 500°C for 8 hours or (b) with an intensity of 10...

Embodiment 2

[0161] Example 2 - Preparation of coatings containing mesoporous titanium dioxide particles

[0162] Paint bases were prepared according to Appendix 1 and then used with the particles as listed in Table 1 above.

[0163] For the "blank" paint (Sample 1), no pigment was added.

[0164] For sample 2, no pigment was added in forming the paint base, but the conventional pigment anatase titanium dioxide (available from Huntsman P&A UK Ltd) was provided as a layer on the paint base in the manner described below A-HR pigment).

[0165] For Sample 3, no pigment was added in forming the paint base, but conventional ultrafine anatase titanium dioxide (PC6A from Huntsman P&A UK Ltd) was provided as a layer on the paint base in the manner described below.

[0166] For sample 4, UV irradiated mesoporous titanium dioxide as obtained in Example 1, variant (b) was added as pigment.

[0167] For sample 5, no pigment was added when forming the paint base, but the UV-irradiated mesoporous ti...

Embodiment 3

[0172] Example 3 - Ability to remove NO gas

[0173] The coated metal panels prepared in Example 2 were weighed and then weathered in a xenon arc weathering chamber for 1000 hours.

[0174] At 1000 hours, the weight loss was measured and the panels were tested according to ISO22197-1 at a flow rate of 1.5 liters / minute to assess their ability to remove NO gas from a 1000 ppb NO gas stream.

[0175] The results are shown in Table 2 below.

[0176] Table 2

[0177]

[0178] The samples according to the invention (samples 4, 5 and 6) resulted in significantly lower coating weight loss after the same exposure than the samples using conventional (non-mesoporous) titanium dioxide (samples 2 and 3). The weight loss of these samples was similar to the blank sample (Sample 1: resin only).

[0179] From this it can be seen that, surprisingly, the products (samples 4, 5 and 6) comprising mesoporous titanium dioxide according to the invention, i.e. high specific surface area anatase...

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PUM

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Abstract

The invention provides a coating composition suitable for use in forming a coating that can reduce the concentration of pollutant gases in the environment, the coating composition comprising polymericmaterial together with mesoporous titania particles. The particles have a continuous exterior convex surface and a particle diameter of greater than or equal to 1[mu]m but less than or equal to 50[mu]m, and a BET specific surface area of from 30m2 / g to 350m2 / g, and a modal pore diameter of greater than or equal to 5nm but less than or equal to 50nm, and a pore size distribution such that 85% or more of the total pore volume is associated with pores with a diameter of 10 [mu]m or less. The coating composition comprises from 0.01% to 10% by volume of said particles, relative to the total volumeof the coating composition and comprises from 5% to 99.99% by volume of polymeric material, relative to the total volume of the coating composition.A coating formed from said composition can be usedfor the removal of pollutant gases, especially in conditions where the coating is exposed to UV radiation from sunlight.

Description

technical field [0001] The present invention relates to coatings comprising mesoporous titanium dioxide particles and their use in the removal of polluting gases. Background technique [0002] Air, water and / or soil pollution has become an important topic in recent years, especially in urban areas. The two most important environmental pollutants are nitrogen oxides (NO x ) and volatile organic compounds (VOCs). These compounds are especially considered undesirable since they trigger the formation of secondary pollutants. [0003] Various schemes have been proposed to reduce the concentration of atmospheric pollutants in the environment. [0004] Titanium dioxide (TiO 2 ) are well known for their photocatalytic properties. Titanium dioxide is activated by ultraviolet (UV) radiation to oxidize air pollutants such as nitrogen oxides and volatile organic compounds. Therefore, titanium dioxide has been used to remove harmful NO x Gas (NO and NO 2 ) is oxidized to nitrate ...

Claims

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Application Information

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IPC IPC(8): C09D7/61B01J21/06B01J35/08B01J35/10A61L9/18A61L9/20C09D5/00C09D7/62
CPCB01J21/063C08K2003/2241A61L9/205C09D5/00B01J37/0244B01J37/345B01J37/0219B01J37/0018C09D7/69C09D7/62C09D7/70B01J31/069Y02A50/20B01J35/39B01J35/613B01J35/615B01J35/66B01J35/647B01J31/06B01D53/007B01D53/8628B01D53/8687B01D53/885B01D2255/20707B01D2255/802B01D2255/9202B01D2255/9207B01J21/08B01J31/38B01J35/50B01J35/51B01J35/67B01J35/635
Inventor J·罗布A·S·万K·劳里D·J·沃特斯J·L·爱德华兹
Owner VENATOR MATERIALS UK LTD
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