Emulsion type paint

Abstract

Buildings surfaces are often seen subjected to application of heat insulation paint. When the surface of buildings gets dirty, reflectivity of the light lowers, so that the surface of buildings is likely to adsorb heat, resulting in lowering of the heat insulation effect. The present invention has such object of providing a paint that the tasks of prevention of getting dirty and provision of heat insulation are achieved, decomposition of resin is much lowered, and applying the paint is readily carried out. An emulsion type paint comprising: an organic hollow balloon A having on the surface photo-catalyst minute particles stuck by heat fusion, an organic hollow balloon B having on the surface minute particles other than photo-catalyst stuck by the similar manner, and an organic resin, colloidal silica, and water, characterized in that the organic hollow balloon B is higher in specific gravity than the organic hollow balloon A.

Claims

1. An emulsion paint comprising: an organic hollow balloon A having on the surface photo-catalyst minute particles stuck by heat fusion, an organic hollow balloon B having on the surface minute particles other than photo-catalyst stuck thereon, and an organic resin, colloidal silica, and water, characterized in that the organic hollow balloon B is higher in specific gravity than the organic hollow balloon A.

2. The emulsion paint as set forth in claim 1 wherein the whole capacity of the organic hollow balloons B and the organic hollow balloons A occupies 50% or more of the capacity of the whole of the paint.

3. The emulsion type paint as set forth in claim 2 wherein the whole capacity of the organic hollow balloons B and the organic hollow balloons A occupies 70% or more of the capacity of the whole of the paint.

4. The emulsion paint as set forth in claim 1 wherein the whole capacity of the colloidal silica occupies 5% or more of the capacity of the whole of the paint.

5. The emulsion paint as set forth in claim 1 wherein the photo-catalyst is titanium oxide and the minute particles other than the photo-catalyst are calcium carbonate minute particles.

6. The emulsion paint as set forth in claim 1, further containing metal powder.

7. The emulsion paint as set forth in claim 1, further containing metal ion.

8. The emulsion paint as set forth in claim 2 wherein the whole capacity of the colloidal silica occupies 5% or more of the capacity of the whole of the paint.

9. The emulsion paint as set forth in claim 3 wherein the whole capacity of the colloidal silica occupies 5% or more of the capacity of the whole of the paint.

10. The emulsion paint as set forth in claim 2 wherein the photo-catalyst is titanium oxide and the minute particles other than the photo-catalyst are calcium carbonate minute particles.

11. The emulsion paint as set forth in claim 3 wherein the photo-catalyst is titanium oxide and the minute particles other than the photo-catalyst are calcium carbonate minute particles.

12. The emulsion paint as set forth in claim 4 wherein the photo-catalyst is titanium oxide and the minute particles other than the photo-catalyst are calcium carbonate minute particles.

13. The emulsion paint as set forth in claim 2, further containing metal powder.

14. The emulsion paint as set forth in claim 3, further containing metal powder.

15. The emulsion paint as set forth in claim 4, further containing metal powder.

16. The emulsion paint as set forth in claim 5, further containing metal powder.

17. The emulsion paint as set forth in claim 2, further containing metal ion.

18. The emulsion paint as set forth in claim 3, further containing metal ion.

19. The emulsion paint as set forth in claim 4, further containing metal ion.

20. The emulsion paint as set forth in claim 5, further containing metal ion.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1: a sectional view of the applied paint according to an example of the present invention.

EMBODIMENTS TO USE THE INVENTION

(2) Next, the present invention will be detailed with referring to the examples. The present invention should not be limited to the examples.

(3) First, the inventor examined anti-fouling effect of photo-catalyst.

(4) As Example 1, the following paint was prepared. Resin component: acrylic resin, 100 wt. part (emulsifier is contained by 2-3% but omitted from explanation. The same in the following explanations) Hollow balloon A: balloon of acrylonitrile (10-50 m in size) to which fused is photo-catalyst particles (anatase type titanium oxide). 10 wt. part (3 wt. part for photo-catalyst) Colloidal silica: 5 wt. part Balloon B: balloon of acrylonitrile (10-50 m in size) to which fused is calcium carbonate powder. 45 wt. part Water: 100 wt. part

(5) A comparative example 1 was prepared without using photo-catalyst and balloons. Resin component: acrylic resin, 100 wt. part Colloidal silica: 5 wt. part Water: 100 wt. part

(6) A comparative example 2 contains photo-catalyst but not using balloons. Resin component: acrylic resin, 100 wt. part Photo-catalyst: 3 wt. part (mixed, in the form of minute particles, in the resin) Colloidal silica: 5 wt. part Water: 100 wt. part

(7) A comparative example 3 uses balloon A but not balloon B. Resin component: acrylic resin, 100 wt. part Hollow balloon A: balloon of acrylonitrile (10-50 m in size) to which fused is photo-catalyst particles (anatase type titanium oxide). 10 wt. part (3 wt. part for photo-catalyst) Colloidal silica: 5 wt. part Water: 100 wt. part

(8) These paints are applied on iron plates and kept intact on the outside for a month. Results and the components are shown in table 1. As clearly seen in the table, definite differences are visually confirmed.

(9) Also, water drops were dropped on the applied paints and contact angles were measured. Definite differences were seen as shown in table 1. Example 1 according to the present invention shows clearly that it is water-soluble to readily clean dirt.

(10) TABLE-US-00001 TABLE 1 Comparative Comparative Comparative Example 1 example 1 example 2 example 3 Quantity of resin 100 100 100 100 Quantity of photo- 3 3 3 catalyst Balloon A 10 10 Colloidal silica 5 5 5 5 Balloon B (calcium 45 carbonate) Water 100 100 100 100 Difference from the Without photo- Photo-catalyst Without balloon B Example 1 catalyst being Kneaded Visually seen Almost no Rain streak of Rain streak of Dirt a little change dirt dirt Contact angles 19 80 50 40

(11) Next, heat insulation effect of the present invention was examined.

(12) In addition to the above-mentioned Example 1, Examples 2 and 3 of modified quantities of balloons were also examined.

(13) The above-mentioned paints were applied in thickness of 0.4 kg/m.sup.2 onto the whole inner wall surface of a box made of an iron plate (thickness about 4 mm) in the form of a cube of 505050 cm. Atmospheric air was placed in the container which kept at 80 C. or 0 C. and was subjected to measuring internal temperatures of the box. Results of measurement are shown in table 2. It is found that heat insulation effect is high due to presence of many balloons.

(14) TABLE-US-00002 TABLE 2 Comparative Example 1 Example 2 Example 3 example 4 Quantity of resin 100 100 100 100 Quantity of photo- 3 3 3 3 catalyst Balloon A 10 5 15 Colloidal silica 5 5 5 5 Balloon B (calcium 45 30 45 carbonate) Water 100 100 100 100 Inner surface 72 C. 75 C. 70 C. 79 C. temperature 1 (80 C.) Inner surface 6 C. 5 C. 6 C. 0.5 C. temperature 2 (0 C.)

(15) Next, weather resistance of paint itself (readiness of decomposition of vehicle) was examined.

(16) Paints of Example 1, Example 4 (balloon A of Example 1 being lowered to 3 wt. part), and Comparative example 5 (photo-catalyst being merely kneaded in quantity of 3 wt. part) were examined. Accelerated weathering test 2,500 hr corresponds to almost 10 years of outdoor exposure.

(17) Test results are as shown in table 3. Examples of the present invention do almost not show chalking, and comparative example 5 had the chalking phenomenon in a short time.

(18) TABLE-US-00003 TABLE 3 Exposure time Comparative (hr) Example 1 Example 4 example 5 250 No abnormality No abnormality Chalking a little 500 No abnormality No abnormality Chalking a little 1250 No abnormality No abnormality Chalking 2500 No abnormality Chalking a little Chalking

(19) Next, efficiency of balloon B was examined.

(20) The present invention does, to balloon B, stick minute powder other than photo-catalyst. Examined was what is suitable for balloon B.

(21) Example 5 employs calcium carbonate minute powder, Example 6 talc, Example 7 barium sulfate, Example 8 aluminum hydroxide. Each shows effects, and most effective is calcium carbonate as shown in Table 4.

(22) TABLE-US-00004 TABLE 4 Example 5 Example 6 Example 7 Example 8 Material Acrylonitrile Acrylonitrile Acrylonitrile Acrylonitrile Particles Calcium Talc Barium sulfate Aluminum to be stuck carbonate hydroxide Size 10-50 m 10-50 m 10-50 m 10-50 m Effect The present Whiteness Whiteness Fire to be invention retardance expected Defect None Clay improved Hard cake Gelation sinking

(23) Shown in FIG. 1 is an example of the state of the components when the paint 1 according to the present invention is applied to the iron plate 2. The FIGURE shows the state of the components before setting or hardening after having been applied. The paint was applied on a horizontal surface but may have substantially the same effect even when the paint is applied on a vertical surface. It is because light things or aqueous things are pulled or drawn to the surface with a force of water content which evaporates and escapes from the surface.

(24) A resin-rich layer 3 positions at the part of paint near the metal surface, and a water phase 4 (where concentration of water is high) positions above the resin-rich layer 3. There is not such apparent distinction. Also, water content does finally evaporate to be almost zero.

(25) Balloon A (accompanied with photo-catalyst, and illustrated in the drawing without hatching) 5, which is light, floats on the surface, and other balloons B (illustrated with hatching) 6 sink into the low part of paint. And colloidal silica 7 exists, in the state of floating, at an intermediate position between the balloons A and balloons B. Specific gravity of the balloons A and B may be regulated to have the positional correlation of the components.

(26) As seen in the drawing, the balloons occupy a large ratio of volume in the paint of the present invention. This has a high effect of heat insulation. In addition, since the balloons A to which photo-catalyst is stuck gather on the surface, the same quantity of photo-catalyst shows a higher effect of anti-fouling in comparison with other type of paint in which photo-catalyst is kneaded.

EXPLANATION OF REFERENCE NUMERALS

(27) 1: paint 2: iron plate 3: resin-rich layer 4: water phase 5: balloon A 6: balloon B 7: colloidal silica