JPH10251560A - Flame-retardant coating material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a flame-retardant coating material that has a long afterglow time without liberation of a halogen gas with low smoke evolution and excellent safety and is useful in night guiding indication materials by using a specific thermoplastic resin, a radioactive substance-free luminescent pigment and a solvent. SOLUTION: This flame-retardant coating material comprises (A) a thermoplastic resin as polyethersulfone or the like having >=30 oxygen index, detecting no halogen gas with a smoke emission (Ds) of <=100, preferably in an amount of 10-75wt.% and (B) a radioactive substance-free luminescent pigment as strontium aluminate (SrAl2 O4 ), preferably in an amount of 15-60wt.% and (C) a solvent as N-methylpyrrolidone, preferably in an amount of 10-30wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flame-retardant paint having a long-lasting light storage, and more particularly, to a flame-retardant paint which can be applied to an induction display material at night, an interior material and the like.

[0002]

2. Description of the Related Art Conventionally, a phosphor has been generally used as a luminous pigment. The afterglow time of this phosphor is extremely short, and its luminescence is rapidly attenuated when the external stimulus is stopped, but rarely after stimulating with ultraviolet rays or the like, or even after the stimulus is stopped, for a considerably long time (several times). 10 minutes to several hours)
In some cases, afterglow is visible to the naked eye, and these are called phosphorescent phosphors or phosphorescent phosphors to distinguish them from ordinary phosphors.

The phosphorescent phosphor is CaS: Bi.
(Purple blue light emission), CaSrS: Bi (blue light emission), Zn
Sulfide phosphors such as S: Cu (green light emission) and ZnCdS: Cu (yellow to orange light emission) are known. Currently, those mainly used in the market are zinc sulfide phosphorescent phosphors (Z
nS: Cu), all of these sulfides have many practical problems, such as being chemically unstable and having poor light resistance.

The luminous paints conventionally used include those obtained by dissolving a zinc sulfide phosphorescent phosphor (ZnS: Cu), a polyolefin as a binder, and an ethylene copolymer such as EVA or EEA in a solvent. It is.

However, in this type of luminous paint, the afterglow time of the zinc sulfide phosphorescent phosphor (ZnS: Cu) is short, and the luminous substance having a long afterglow time is the radioactive substance Pm.
(Promethium), etc., and there is a problem in terms of safety. Further, a binder such as an ethylene copolymer itself has poor flame retardancy, and there is a problem that halogen gas and smoke are generated when burning such as a fire.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of conventional luminous paints, and is intended to solve the problem. A luminous pigment containing no radioactive material and having a long afterglow time is required. An object of the present invention is to provide a flame-retardant paint which is used, emits no halogen gas at the time of combustion, and emits low smoke.

[0007]

Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have conducted intensive studies on a thermoplastic resin as a binder and a luminous pigment, and have found that a specific thermoplastic resin and a specific luminous pigment are used. It was found that the intended flame-retardant paint could be obtained by using the same, and the present invention was completed. That is, the flame-retardant coating material of the present invention contains a thermoplastic resin having an oxygen index of 30 or more and a smoke density of not more than Ds100 with no halogen gas detected, a luminous pigment containing no radioactive substance, and a solvent. It is characterized by becoming.

[0008]

Embodiments of the present invention will be described below in detail. The flame retardant paint of the present invention has an oxygen index of 30.
Above, and no halogen gas was detected and the smoke density was D
It comprises a thermoplastic resin of s100 or less, a luminous pigment containing no radioactive substance, and a solvent.

The thermoplastic resin as a binder used in the flame-retardant paint of the present invention must have an oxygen index of 30 or more, no halogen gas is detected, and a smoke density Ds of 100 or less. When the oxygen index is less than 30,
When the smoke density Ds exceeds 100, sufficient flame retardancy is not exhibited, which is not preferable. The “oxygen index” defined in the present invention is an oxygen index defined in JIS K 7201, and is measured by a method specified in JIS K 7201. The larger the index value, the more difficult the material is to burn. In addition, the "smoke density D" defined in the present invention.
"s" is the smoke density defined in ASTM E662, and is measured by the method defined in ASTM E662. The smaller the index value, the less the smoke-producing material.

Examples of the thermoplastic resin having the above properties used in the flame-retardant paint of the present invention include polyethersulfone (PES), polyarylate (PAr), polyetherimide (PEI), polysulfone (PSF), and the like.
Engineered plastics such as nylon resin (PA) and the like can be mentioned, and a highly transparent thermoplastic resin having the above characteristics is preferable.

The luminous pigment used in the flame-retardant paint of the present invention is not particularly limited as long as it is a luminous pigment containing no radioactive substance. Preferably, those which are chemically stable, have light resistance for a long time, and have a long-term afterglow characteristic are preferable.
_{In the} compound represented by ₂ O ₄ , M is a phosphorescent phosphor in which a mother crystal is a compound comprising at least one metal element selected from the group consisting of calcium, strontium, and barium. Specifically, strontium aluminate (SrAl ₂ O ₄ ), calcium aluminate (CaAl ₂ O ₄ ), barium aluminate (BaAl ₂
O ₄ ), strontium calcium aluminate (Sr _x C
a _1-x Al ₂ O ₄ ).

Further, in the phosphorescent phosphor represented by MAl ₂ O ₄ , M comprises a plurality of metal elements obtained by adding magnesium to at least one metal element selected from the group consisting of calcium, strontium and barium. Phosphorescent phosphor having a compound as a mother crystal, for example, Sr _x Mg _1-x A
l ₂ O _{4 and the} like can also be used.

Furthermore, as an activator, europium (E
u) is a phosphorescent phosphor in which 0.001 to 10 mol% is added to the metal element represented by M, and lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, terbium, as a co-activator in addition to the activator. Luminescent property in which at least one element selected from the group consisting of dysprosium, holmium, erbium, thulium, ytterbium, lutetium, manganese, tin, and bismuth is added in an amount of 0.001 to 10 mol% with respect to a metal element represented by M Phosphors can be used.

The solvent used in the flame-retardant paint of the present invention is not particularly limited, and examples thereof include methylene chloride, N-methylpyrrolide (NMP), methyl ethyl ketone (MEK) and the like.

[0015] In the flame-retardant paint of the present invention, based on the total weight,
The thermoplastic resin having the above properties as a binder is 1
0 to 75% by weight, 15 to 60% by weight of the luminous pigment, and 10 to 30% by weight of the solvent. If the content of the thermoplastic resin as the binder is less than 10% by weight, the adhesiveness is undesirably reduced. On the other hand, if the luminous pigment is less than 10% by weight, the afterglow characteristics become insufficient, which is not preferable.

The flame-retardant paint of the present invention can be prepared by mixing the above components using a usual mixer or the like.

The flame-retardant paint of the present invention has a long afterglow time due to the use of a long-lasting phosphorescent luminous pigment, and is a safe paint that produces no halogen gas and produces little smoke. As a result, the use of the paint is not particularly limited, and can be applied to any use. For example, the paint can be applied to a guide display material at night, an interior material, and the like. Examples of the use of guidance display materials include:
As shown in FIG. 1, polyether sulfone (PE
S) An induction display panel having a sandwich structure in which the flame-retardant paint 2 of the present invention is applied on the plate 1 and the PES plate 3 is fixed thereon, etc. If the induction display panel has this structure, ,
There is no fear that the coated surface will peel off, and it is flame-retardant PE
Since the S plate is used, an induction display panel having excellent flame retardancy is obtained in combination with the flame retardant paint.

[0018]

Next, the contents of the present invention will be described in more detail with reference to Examples and Comparative Examples. The present invention is not limited by the following examples.

(Examples 1 to 3 and Comparative Examples 1 and 2) The flame retardant paint having the composition shown in Table 1 below has an oxygen index (O
I), the amount of generated halogen gas and the smoke density framing were evaluated, and the flame retardant paint was applied to each synthetic resin plate, and the afterglow time was measured. Also, the results of measuring the afterglow time when the same amount of the conventional ZnS-Cu-based paint is blended in place of the luminescent pigment according to the present invention are shown. The results are shown in Table 1 below.

The methods for measuring the oxygen index (O.I), the amount of halogen gas generated, the smoke density framing, and the afterglow time are as follows. (1) Oxygen Index (O.I) The oxygen index (O.I) was measured for only the paint after the solvent was volatilized in accordance with JIS K7201. The larger the index value, the more difficult the material is to burn. (2) Halogen gas generation amount (mg / g) The halogen gas generation amount was measured in accordance with ASTM E662.

(3) Smoke density framing Smoke density framing was measured in accordance with IEC754-1. The smaller the index value, the less the smoke-producing material. (4) Afterglow time Luminance was measured in accordance with JIS C 7614, and the time required for the afterglow luminance to attenuate to a level of 0.32 mcd / m ² for human recognition was defined as the afterglow time.

[0022]

[Table 1]

As is evident from Table 1, the flame retardant paints of Examples 1 to 3 which fall within the scope of the present invention have an oxygen index (O.I. ), The amount of halogen gas generated, the smoke density framing, and the afterglow time were all excellent. Further, the synthetic resin of Examples 1 to 3 and Comparative Examples 1 and 2 was replaced with a conventional ZnS-C.
It was found that the afterglow time when the same amount of the u-based paint was mixed was 60 minutes or less.

[0024]

According to the present invention, since a long-lasting phosphorescent luminous pigment is used, a paint having a long afterglow time can be obtained, and there is no generation of halogen gas, and there is little smoke. A flame retardant paint is provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining an example in which the flame retardant paint of the present invention is used for an induction display panel.

[Explanation of symbols]

 1,3 Polyethersulfone (PES) plate 2 Flame retardant paint

Claims (1)

[Claims] 1. A thermoplastic resin having an oxygen index of 30 or more, a halogen concentration not detected, and a smoke density of 100 or less, a luminescent pigment containing no radioactive substance, and a solvent. Flame retardant paint.