Electrochromic material and anti-dazzle mirror having the same

Abstract

Comparing to conventional electrochromic material showing a primary drawback of high manufacturing cost due to low synthetic yield, the inventors of the present invention modulate the chemical structure of a traditional viologen compounds so as to develop a novel electrochromic material performing an excellent advantage of low manufacturing cost resulted from high recovery rate. Moreover, differing from conventional electrochromic devices (ECD) installed with the conventional electrochromic material, the inventors of the present invention also propose an anti-dazzle mirror having the novel electrochromic material, wherein the proposed anti-dazzle mirror shows an outstanding reflectivity performance.

Claims

1. An electrochromic material, being a viologen compound having a specific chemical structure represented by following chemical formula (1): ##STR00006## wherein both X1 and X2 in the chemical formula (1) are a halogen, and A.sup.− being a compensatory ion.

2. The electrochromic material of claim 1, wherein the compensatory ion is selected from the group consisting of: BF.sub.4.sup.−, PF.sub.6.sup.−, AsF.sub.6.sup.−, ClO.sub.4.sup.−, CH.sub.3COO.sup.−, CH.sub.3(C.sub.6H.sub.4)SO.sub.3.sup.−, and (CF.sub.3SO.sub.2).sub.2N.sup.−.

3. The electrochromic material of claim 1, wherein the compensatory ion is a halogen ion.

4. An anti-dazzle mirror, comprising: a mirror body, comprising: a first transparent layer; a first electrode layer, being disposed on the first transparent layer; an electrochromic layer, being disposed on the first electrode layer and comprising an electrochromic material; a second electrode layer, being disposed on the electrochromic layer; a second transparent layer, being disposed on the second electrode layer; and a reflective film, covering the second transparent layer, wherein the electrochromic material is a viologen compound having a specific chemical structure represented by following chemical formula (1): ##STR00007## wherein both X1 and X2 in the chemical formula (1) are a halogen, and A.sup.− being a compensatory ion.

5. The anti-dazzle mirror of claim 4, further comprising a frame for housing the mirror body.

6. The anti-dazzle mirror of claim 4, wherein the compensatory ion is selected from the group consisting of: BF.sub.4.sup.−, PF.sub.6.sup.−, AsF.sub.6.sup.−, ClO.sub.4.sup.−, CH.sub.3COO.sup.−, CH.sub.3(C.sub.6H.sub.4)SO.sub.3.sup.−, and (CF.sub.3SO.sub.2).sub.2N.sup.−.

7. The anti-dazzle mirror of claim 4, wherein the compensatory ion is a halogen ion.

8. The anti-dazzle mirror of claim 4, wherein both the first transparent layer and the second transparent layer are selected from the group consisting of: transparent glass and transparent acrylic.

9. The anti-dazzle mirror of claim 4, wherein the manufacturing material of the reflective film is selected from the group consisting of: aluminum (Al), silver (Ag), copper (Cu), chromium (Cr), and combination thereof.

10. The anti-dazzle mirror of claim 4, wherein a seal agent is used for attaching the first transparent layer disposed with the first electrode layer to the second transparent layer disposed with the second electrode layer.

11. The anti-dazzle mirror of claim 10, wherein the seal agent is selected from the group consisting of: light curing adhesive and heat curing adhesive.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention as well as a preferred mode of use and advantages thereof will be best understood by referring to the following detailed description of an illustrative embodiment in conjunction with the accompanying drawings, wherein:

(2) FIG. 1 shows a stereo diagram of an anti-dazzle mirror having a novel electrochromic material;

(3) FIG. 2 shows an exploded view of the anti-dazzle mirror; and

(4) FIG. 3 shows a cross-sectional view of the anti-dazzle mirror.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(5) To more clearly describe an electrochromic material and an anti-dazzle mirror having the electrochromic material according to the present invention, embodiments of the present invention will be described in detail with reference to the attached drawings hereinafter.

(6) The present invention proposes an electrochromic material, which is a viologen compound having a specific chemical structure represented by following chemical formula (1), wherein both X1 and X2 in the chemical formula (1) are a halogen, and A.sup.− is a compensatory ion.

(7) ##STR00005##

(8) It needs to further explain that, the said compensatory ion is selected from the group consisting of: BF.sub.4.sup.−, PF.sub.6.sup.−, AsF.sub.6.sup.−, ClO.sub.4.sup.−, CH.sub.3COO.sup.−, CH.sub.3(C.sub.6H.sub.4)SO.sub.3.sup.−, and (CF.sub.3SO.sub.2).sub.2N.sup.−. Moreover, the compensatory ion can also be a halogen ion. On the other hand, it is worth noting that the X1 and X2 can be two identical halogens or two different halogens.

EMBODIMENT

(9) For proving the practicability of the novel electrochromic material proposed by the present invention, an exemplary synthesizing method for the electrochromic material will be introduced in follows. The synthesizing method mainly consists 6 manufacture processing steps of: step (1): adding 0.1-mol 4,4′-bipyridine and 0.22-mol 3-fluorobenzyl bromide into a first round-bottom flask; step (2): adding acetonitrile into the first round-bottom flask, and then stirring the solution in the first round-bottom flask; step (3): rising the temperature of the solution in the first round-bottom flask up to a first reaction temperature of 85° C., and then keeping the first reaction temperature for 48 hours; after that, a semi-finished product is produced in first round-bottom flask by 87% yield, and the semi-finished product is 1,1-bis (3-fluorobenzyl bromide) benzyl-4,4′-bipyridinium dibromide; step (4): adding an aqueous solution of hexafluorophosphate into a second round-bottom flask; step (5): rising the temperature of the solution in the second round-bottom flask up to 85° C., and then adding the obtained semi-finished product into the second round-bottom flask; and step (6): cooling the temperature of the solution in the second round-bottom flask down to 4° C.; after that, a product is produced in second round-bottom flask by 85% yield, and the product is 1,1-bis(3-fluorobenzyl bromide) benzyl-4,4′-bipyridinium dibromide.

(10) Continuously, the novel electrochromic material is applied in an automotive mirror, such that an anti-dazzle mirror is obtained. Please refer to FIG. 1, which illustrates a stereo diagram of the anti-dazzle mirror having the novel electrochromic material. As FIG. 1 shows, the anti-dazzle mirror 1 mainly comprises a mirror body 11 and a frame 10 for housing the mirror body 11. Continuously referring to FIG. 1, and please simultaneously refer to FIG. 2 and FIG. 3, where an exploded view and a cross-sectional view of the anti-dazzle mirror are respectively provided. Please read FIG. 2 and FIG. 3 according to the direction line formed by points A and B shown in FIG. 1. As FIG. 1, FIG. 2 and FIG. 3 show, the mirror body 11 comprises: a first transparent layer 111, a first electrode layer 112, an electrochromic layer 113, a second electrode layer 114, a second transparent layer 115, and a reflective film 116, wherein both the first transparent layer 111 and the second transparent layer 115 can be a transparent glass or a transparent acrylic.

(11) Moreover, the first electrode layer 112 is disposed on the first transparent layer 111, and the electrochromic layer 113 comprising the novel electrochromic material is disposed on the first electrode layer 112. As the descriptions made above, the novel electrochromic material is a viologen compound having a specific chemical structure represented by the chemical formula (1). On the other hand, the second electrode layer 114 is disposed on the electrochromic layer 113, and the second transparent layer 115 is disposed on the second electrode layer 114. As the engineers skilled in automotive mirror designing and manufacturing technology field know, the top surface of the second transparent layer 115 is coated or covered with a reflective film 116, wherein the manufacturing material of the reflective film is selected from the group consisting of: aluminum (Al), silver (Ag), copper (Cu), chromium (Cr), and combinations thereof.

(12) Before assembling the first transparent layer 111, the first electrode layer 112, the electrochromic layer 113, the second electrode layer 114, the second transparent layer 115, and the reflective film 116 to the mirror body 11, it needs to firstly adding the electrochromic material obtained from the step (6) and a phenazine compound in to a solvent of propylene carbonate by a mole ratio of 1:1, so as to produce an electrochromic material solution. Herein, it is worth explaining that the concentration of the novel electrochromic material in the electrochromic material solution is in a range from 250 mmol/L to 4000 mmol/L. Next, a seal agent 110 (as FIG. 2 shows) is used for making the first transparent layer 111 disposed with the first electrode layer 112 and the second transparent layer 115 disposed with the second electrode layer 114 attach to each other. Thus, the first transparent layer 111, the first electrode layer 112, the electrochromic layer 113, the second electrode layer 114, the second transparent layer 115, and the reflective film 116 are assembled to the mirror body 11.

(13) From FIG. 2, it can find that the seal agent 110 is provided with a filling opening 117; so that, the electrochromic material solution is injected into an accommodating space enclosed by the seal agent 110, so as to form the electrochromic layer 113 located between the first electrode layer 112 and the second electrode layer 114. In the present invention, the seal agent 110 can be a light curing adhesive or a heat curing adhesive. Moreover, the seal agent 110 is mixed with a plurality of glass balls having a specific ball sizes. Because the ball size is in a range from 0.1 mm to 0.3 mm, the glass balls mixed in the seal agent 110 can be adopted for being spacers between the first electrode layer 112 and the second electrode layer 114 in order to guarantee the formation of the accommodating space. Eventually, after using a light curing adhesive to seal the filling opening 117 and subsequently using UV light to solidify the light curing adhesive, the product of the mirror body 11 is finished; and then, the final product of the anti-dazzle mirror 1 can be produced after embedded the mirror body 11 into the frame 10. After obtaining the anti-dazzle mirror 1 proposed by the present invention, the reflectivity and color changing speed of the anti-dazzle mirror 1 is measured and recorded in following Table (2) and Table (3).

(14) TABLE-US-00002 TABLE 2 Measurement items Results Reflectivity obtained without changing the 59.81% electrochromic material's color Reflectivity obtained without changing the 59.13% electrochromic material's color (measured after treating the anti-dazzle mirror with a high-temperature storage of 90° C. for 8 hours) Reflectivity obtained without changing electro- 58.24% chromic material's color (measured after treating the anti-dazzle mirror with a low-temperature storage of −40° C. for 8 hours) Reflectivity obtained without changing the 57.94% electrochromic material's color (measured after treating the anti-dazzle mirror with a storage with high-temperature of 60° C. and high-humidity of 90% for 8 hours) Reflectivity obtained without changing the 59.47% electrochromic material's color (measured after treating the anti-dazzle mirror with 60000-time cycling test by DC 1.2 V)

(15) TABLE-US-00003 TABLE 3 Measurement items Results Reflectivity obtained after changing the electrochromic 7.13% material's color Color changing speed (from 55% to 10%) 2 s Color changing speed (from 10% to 55%) 7 s Reflectivity obtained after changing the electrochromic 8.90% material's color (measured after treating the anti-dazzle mirror with a high-temperature storage of 90° C. for 8 hours) Reflectivity obtained after changing electrochromic 9.40% material's color (measured after treating the anti-dazzle mirror with a low-temperature storage of −40° C. for 8 hours) Reflectivity obtained after changing the electrochromic 9.28% material's color (measured after treating the anti-dazzle mirror with a storage with high-temperature of 60° C. and high-humidity of 90% for 8 hours) Reflectivity obtained after changing the electrochromic 9.35% material's color (measured after treating the anti-dazzle mirror with 60000-time cycling test by DC 1.2 V)

(16) Therefore, from above-presented Table (2) and Table (3), the engineers skilled in designing and manufacturing electrochromic materials can easily find that, the proposed anti-dazzle mirror 1 having the novel electrochromic material performs a good anti-dazzle effect for automobile drivers because the reflectivity of the anti-dazzle mirror 1 measured after changing electrochromic material's color is down to 7.13%. On the other hand, after comparing Table (3) with Table (1), it can also find that the reflectivity of the anti-dazzle mirror 1 measured after changing the novel electrochromic material's color is lower than the reflectivity of the automotive mirror measured after changing the improved electrochromic material's (disclosed by Taiwan patent number I265972) color.

(17) Therefore, through above descriptions, the novel electrochromic material and the anti-dazzle mirror having the novel electrochromic material provided by the present invention has been introduced completely and clearly; in summary, the present invention includes the advantages of:

(18) (1) Comparing to conventional electrochromic materials disclosed by Taiwan patent number I265972 showing a primary drawback of high manufacturing cost due to low synthetic yield, the inventors of the present invention modulate the chemical structure of a traditional viologen compound so as to develop a novel electrochromic material performing an excellent advantage of low manufacturing cost resulted from high recovery rate.

(19) (2) Moreover, differing from the conventional electrochromic device (ECD) taught by Taiwan patent number I265972, the inventors of the present invention also propose an anti-dazzle mirror having the novel electrochromic material, wherein the proposed anti-dazzle mirror shows an outstanding reflectivity performance.

(20) The above description is made on embodiments of the present invention. However, the embodiments are not intended to limit scope of the present invention, and all equivalent implementations or alterations within the spirit of the present invention still fall within the scope of the present invention.