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White color reflecting material and process for production thereof

A white reflection, substrate technology, applied in thin material processing, photovoltaic power generation, instruments, etc., can solve the problems of large reflectivity changes over time, epoxy resin deterioration, reflectivity decline, etc., to achieve excellent durability and weather resistance. Excellent, high mechanical strength effect

Active Publication Date: 2012-05-23
ASAHI RUBBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Plastic reflective materials such as polycarbonate resin containing rutile titanium oxide cannot fully reflect the light emitted from this light-emitting diode, which is close to the lower limit of the visible region in the wavelength range of 360 nm or more, especially in the wavelength range of 380 to 400 nm.
[0008] In Patent Document 2, a semiconductor light-emitting device is disclosed. The semiconductor light-emitting device uses a resin composition formed by dispersing anatase-type titanium oxide having a good reflectance in a wide wavelength region in an epoxy resin. The substrate and the light-emitting element are bonded, but the reflectance of the semiconductor light-emitting device changes greatly over time, and the epoxy resin gradually deteriorates, resulting in a decrease in reflectance over time
[0009] In addition, as the light-emitting wavelength shortens and the output increases, most light-emitting diodes use silicon-based sealing resins that are excellent in heat resistance and light resistance as sealing resins. Diformamide, polyetheretherketone and other resin packaging members have different shrinkage rates, and there is a problem of insufficient adhesion, so a new design of packaging is required.

Method used

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  • White color reflecting material and process for production thereof
  • White color reflecting material and process for production thereof
  • White color reflecting material and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] Add dispersed anatase type titanium oxide (trade name SA-1; Japan Sakai Chemical Industry Co., Ltd. ( Sakai Chemical Industry Co., Ltd.) 10 parts by mass, heated and pressurized, and cured at 170° C. for 5 minutes to produce a white reflective plate with a length of 70 mm, a width of 70 mm, and a thickness of 1 mm. Thereafter, annealing was performed at 170° C. for 90 minutes to prepare a measurement sample. The reflectance after elapse of 1000 hours at 150 degreeC was measured using the spectrophotometer UV-3150 (made by Shimadzu). Here, the reflectance was measured with respect to the light of three wavelengths (380nm, 550nm, and 780nm). The measurement results are shown in Table 1 below.

[0126] [Table 1]

[0127] Table 1

[0128]

[0129] "Evaluation of reflectance after a period of time at high temperature"

[0130] Table 1 shows that after 1000 hours, no significant drop in reflectance was observed, and no yellowing or deterioration occurred, so it is exc...

Embodiment 2 and comparative example 1

[0132] In 100 mass parts of bismaleimide-triazine resin (BT resin), glass epoxy resin (GE resin) respectively, add dispersed rutile type titanium oxide (trade name SR-1; Chemical Industry Co., Ltd.) 100 parts by mass to prepare one substrate each having a film thickness of 50 μm.

[0133] On the other hand, a bismaleimide-triazine resin substrate and a glass epoxy resin substrate having a thickness of 25 μm were obtained in the same manner as above.

[0134] Using a bar coater, the silicon composition was coated on each base material (BT resin base material, GE resin base material) having a thickness of 25 μm to prepare a silicone resin composition coating having a thickness of 25 μm. A laminate of films to obtain a white reflective plate with a thickness of 50 μm, wherein the silicon composition is obtained by adding rutile-type titanium oxide (trade name SR-1; Sakai Chemical Industry Co., Ltd., Japan) to the silicone resin used in Example 1. (manufactured by Sakai Chemical ...

Embodiment 3

[0140] On a BT resin substrate with a thickness of 25 μm obtained in the same manner as in Example 2, the proportions of rutile-type titanium oxide were 10 parts by mass (phr), 25 phr, and 50 phr relative to 100 parts by mass of the silicone resin. , and 250 phr of the titanium oxide-containing silicone composition were respectively coated into a film with a thickness of 25 μm, thereby obtaining a laminated white reflective material with a thickness of 50 μm. Carry out the reflectivity measurement identical with embodiment 2, the correlation between its irradiation wavelength and reflectivity is shown in Figure 8 . In addition, the same heat treatment and reflectance measurement as in Example 2 were carried out, and the correlation between the irradiation wavelength and the reflectance was shown in Figure 9 .

[0141] "Evaluation of the reflectance of rutile-type titanium oxide in a laminated white reflector with a film thickness of 25 μm coated on a base material made of ...

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Abstract

A general-use white color reflecting material, and a process for production thereof are provided. The white color reflecting material, without troublesome surface treatment such as formation of a reflective layer by metallization, is capable of reflecting a near-ultraviolet ray of a wavelength region of 380 nm or longer or a near-infrared ray sufficiently without light leakage; does not become yellow even when exposed to near-ultraviolet rays; has excellent lightfastness, heat resistance, and weatherability; has high mechanical strength and chemical stability; is capable of maintaining a high degree of whiteness; and is easily moldable at a low cost. Further a white color reflecting material used as an ink composition for producing the white color reflection material in a film-shape is also provided. The white-color reflecting material (10. 16) is molded as a dispersion of particles (12a. 12b) of anatase-type or rutile-type of titanium oxide in a silicone resin or silicone rubber, and comprises a titanium oxide-containing silicone composition.

Description

technical field [0001] The present invention relates to a white reflective material and its manufacturing method. The white reflective material can be used as a substrate for semiconductor optical elements such as semiconductor light-emitting elements and solar cell elements, or accommodate these optical elements to form a reflection around the optical elements. The white reflective material is relatively stable to light and heat rays, does not leak light and has high reflection efficiency, and can stably maintain these performances for a long time and reflect. Background technique [0002] Light-emitting diodes (LEDs) are used as light sources for various light-emitting devices such as lighting fixtures, signal machines, and backlights for liquid crystal displays. Such light-emitting diodes, especially high-intensity light-emitting diodes, are widely used because they consume less power than white lighting devices such as incandescent bulbs, halogen lamps, mercury lamps, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/60G02B5/08H01L31/042
CPCY02E10/52H01L31/035281G02B5/0808H01L31/068Y02E10/547H01L31/048H01L33/60H01L2933/0091H01L31/0525H01L31/0522H01L2933/0058H01L2224/48091H01L2924/3025H01L31/0547H01L31/0682Y10T428/23Y10T428/266Y10T428/31663H01L2924/00014H01L2924/00
Inventor 田崎益次五十岚直人小田喜勉吉田舞美
Owner ASAHI RUBBER
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