JP2002071663A - Coloring paper and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide coloring paper easily allowing color identification to a solvent such as a chlorine solvent, alcohol and amine. SOLUTION: The color identification test paper contains at least three kinds of coloring agents and a paper strengthening agent and has the hue of paper in a range of 10.0 R to 10.0 Y in Munsell hue, the brightness of color in a range of 5.0 to 10.0 in Munsell value and saturation in a range of 0.5 to 5.0 in Munsell chroma in a Munsell color system, and further has the bulk density of paper in a range of 0.1 g/cc to 1.0 g/cc, and the thickness in a range of 0.1 mm to 0.3 mm. The color identification paper turns red when coming in contact with the chlorine solvent, turns yellow when coming in contact with alcohol and turns dark green-blue when coming in contact with amine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color paper capable of distinguishing a mist or a liquid chemical. In particular, the present invention relates to a color paper that can identify the type of a chemical, which is an organic solvent having a different property, instantly without using an analyzer or a special technique.

[0002]

2. Description of the Related Art As a device for easily distinguishing a liquid chemical, for example, a PH test paper which can measure the degree of acidity or alkalinity of an aqueous solution is known. In addition, test papers for semi-quantitative measurement of specific ion species in an aqueous solution are commercially available. However, there is no coloring paper for an organic solvent that can identify the type of the solvent instantly.

It is empirical to identify the type of organic solvent based on its color, viscosity, odor, solubility with other compounds, etc., and to identify it by chemical analysis or instrumental analysis. It is.

[0004] For example, in a method based on chemical analysis, there is a method in which chlorine-containing organic matter is obtained by collecting Cl2 obtained by a flask combustion method and then utilizing an oxidation-reduction reaction. For amines, coloration with quinhydrone can be mentioned, and for alcohols, coloration due to coordination compound formation with cerium ammonium nitrate and HNO3 is used. In instrumental analysis, it is identified by a chromatographic method or an absorption method. However, according to the analysis of such a method, test equipment and facilities are required, and it is difficult to identify easily and quickly.

[0005] In the above-described methods based on chemical analysis and instrumental analysis, in an emergency, for example, when a liquid chemical (organic solvent or the like) flows out in a laboratory or a laboratory, it is unknown what the substance is. In such a case, it is not possible to immediately determine an appropriate measure. When acid or alkali is discharged, an appropriate measure can be taken by measuring the pH with a PH test paper or the like and neutralizing the measure. However, when an organic solvent or the like flows out, the color is not developed by the PH test paper, so that it is difficult to specify a substance and to take an appropriate measure.

In recent years, in order to prevent chemicals from flowing out of business facilities, rapid identification of erroneously leaked chemicals has been desired in order to prevent the outflow of chemicals from business facilities due to the increasing awareness of global environmental conservation.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a color paper which can easily and instantaneously identify a color with respect to a solvent such as a chlorinated solvent, an alcohol or an amine.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, have reached the present invention. That is, it contains at least three colorants and a paper strength agent,
In the Munsell color system, the hue of the paper is Munsell Hue
It is in the range of 10.0R to 10.0Y and the brightness is Munsell V
color test paper characterized in that the color is in the range of 5.0 or more and 10.0 or less and the saturation is in the range of 0.5 or more and 5.0 or less in Mansell Chroma, and the bulk density of the paper is 0.1 g / cc or more, 1.0 g / cc or less, thickness of 0.1 mm or more, 0.3 mm or less, and red when contacted with a chlorinated solvent, yellow when contacted with alcohol, and amines The color paper is characterized by exhibiting a dark green-blue color when it comes into contact with the paper.

Further, as a coloring agent for coloring, a particle size of 10
A color paper characterized by using a powder colorant having a ratio of 0 μm or less and 1 μm or less of less than 1%.

The paper-making method according to claim 1, wherein the pulp, the paper strength enhancer, the precipitant, and the coloring agent powder are mixed to form a slurry, and then a coagulant is added to make the paper. The present invention relates to a method for producing colored paper.

It is desirable that PVA as a paper strength enhancer be contained in an amount of 1.0% by weight or more and 10.0% by weight or less. If the content is low, the strength of the paper is low, and if the content is high, there is a problem that the permeation of the target organic solvent is poor and the color development is poor.

BEST MODE FOR CARRYING OUT THE INVENTION

Colored paper has a hue in the Munsell color system.
10.0R to 10.0Y, preferably, in the range of 5.0YR to 5.0Y or less, and the brightness is 5.0 or more, 10.0 or less, preferably, 6.5 or more, 8.5 or less, and the saturation is 0.5 or more,
The range is 5.0 or less, preferably 1.0 or more and 3.0 or less.
Otherwise, there is a problem that the discriminability at the time of coloring is deteriorated.

The color paper has a bulk density of 0.1 g / cc or more and 1.0 g / cc or less, preferably 0.3 g / cc or more and 0.6 g / cc or less, and a thickness of the paper. 0.1
mm or more and 0.3 mm or less, preferably 0.15 mm
At least 0.20 mm. The bulk density is 0.1 g /
If it is less than cc, the paper strength is insufficient, and when a small droplet of the drug to be identified adheres, the droplet does not spread and as a result, the droplet cannot be identified. Also, 1.0
There is a problem that paper exceeding g / cc is difficult to manufacture. Similarly, it is difficult to manufacture paper having a thickness of less than 0.1 mm, and if the thickness exceeds 0.3 mm, there is a problem that the droplets are difficult to spread.

The following combinations are optimal for the colorant used in the present invention, but are not necessarily limited in the present invention. The fact that color test papers show different colors in different solvents means that 2,5,2 ', 5'TetraMethyl
triphenylmethane-4,4'-Diazo-bis-β-hydroxynaphtoic
anilid (hereinafter abbreviated as TMD), 4- (4'-Phenylazoyl) Phe
nylazo-Phenol (hereinafter abbreviated as PPP) and Ethyl-bis
-(2,4-Dinitrophenyl) acetate (hereinafter abbreviated as EDA).

When the combination of solvents to be identified and identified is a chlorine-based solvent, an alcohol, and an amine-based solvent, when the liquid adheres to the coloring paper, TMD dissolves only in the chlorine-based solvent, turns red, and adheres. Notify that the droplet is a chlorinated solvent. When the attached liquid is alcohols, the color of the PPP sheet is deepened by the vibration of electrons, and the colored paper is colored yellow to notify that the attached droplets are alcohols. Similarly, when the adhering liquid is an amine-based solvent, the charge changes to a benzene ring, so that the coloring paper develops a green color to inform that the adhering droplet is an amine-based solvent.

In the color paper, the colorant has a particle size of 1 μm or more,
00 μm or less, and preferably 5 μm or more and 75 μm
The following are desirable: If the particle size of the colorant exceeds 100 μm, it becomes difficult to distinguish the color of the trace amount of solvent, and 1 μm.
If it exceeds m, the background color of the paper becomes dark and the brightness becomes dark, so that it becomes difficult to discriminate the coloration of the trace amount of organic solvent, so that the color paper intended for the present invention cannot be obtained.

Further, the proportion of the colorant having a particle size of 1 μm or less is less than 1%, preferably 0%. If it is 1% or more, the background color of the paper is dark and the brightness is dark, and it is difficult to distinguish the coloration of a trace amount of the organic solvent.

The coloring paper contains 0.2% to 2.0% by weight of TMD as a coloring agent, 1.0% to 10.0% by weight of PPP, and 1.0% by weight of EDA. %that's all,
Desirably, the content is 10.0% by weight or less. If the content of the coloring agent is small, it is difficult to discriminate the color when it is colored, and if the content is large, the color of the trace amount of solvent is increased because the background color of the paper is dark and the brightness is dark. , It is difficult to identify the color paper.

[0019]

Examples are shown below.

Hue, lightness and saturation are described in JIS Z
The measurement was performed based on the “color display method based on three attributes” defined in 8721.

As a test method of color development performance, tetrachloroethylene (Chemical A), isopropyl alcohol (Chemical B) and dimethylamine (Chemical C) were each 0.1% in a standard state (left at 20 ° C. and RH 60%). And 0.01 μl was dropped, and the coloring performance was evaluated as ○ when the color developed within 5 seconds after the drop was judged as pass, and the discrimination performance was evaluated as a pass when red, yellow and green could be identified 5 seconds after the drop. Judged by ×.

Example 1 50 parts each of NBKP pulp and LBKP pulp having a beating degree of SR-15, a fineness of 1.1 decitex, 3 parts of a fibrous binder (PVA) having a fiber length of 3 mm, and a yellow dye for adjusting hue (bayer japan) 0.01 parts of RBY7GL (manufactured by Meisei Chemical Co., Ltd.), and then dispersed in water using a dispersant (Disper TL manufactured by Meisei Chemical Co., Ltd.) five times the colorant beforehand.
TMD having a ratio of 0.8% at μm and 1 μm or less
1.0 part, 5 parts of PPP and 5 parts of EDA were mixed, and finally 0.2 parts of an anionic polymer flocculant (PAM) was mixed to carry out wet papermaking to prepare a colored paper having a basis weight of 75 g / m ² . .

Comparative Example 1 NBK having the same degree of beating degree SR-15 as used in Example 1
50 parts each of P pulp and LBKP pulp, 3 parts of a fibrous binder, 0.01 part of a yellow dye, and an average particle diameter of 14 μm previously dispersed in water using a dispersant five times the color former.
m and the ratio of 1 μm or less is 15%.
5 parts, 5 parts of PPP, 5 parts of EDA and 0.2 parts of anionic polymer coagulant were mixed at a time, and wet papermaking was performed.
g / m ² of colored paper was prepared.

Comparative Example 2 NBK having the same degree of beating degree SR-15 as used in Example 1
After mixing 50 parts each of P pulp and LBKP pulp, 3 parts of a fibrous binder, and 0.01 part of a yellow dye, the mixture was previously dispersed in water using a dispersant five times as large as the colorant to give an average particle size of 150 μm. In addition, 1 part of TMD, 5 parts of PPP and 5 parts of EDA having a ratio of 100 μm or more of 30% are mixed, and finally 0.2 parts of a nonionic polymer flocculant is mixed to perform wet papermaking, and a basis weight of 75 g / m ² is obtained. Colored paper was created.

Comparative Example 3 NBK having the same degree of beating degree SR-15 as used in Example 1
50 parts each of P pulp and LBKP pulp, 3 parts of a fibrous binder, and previously dispersed in water using a dispersant 5 times the colorant, having an average particle size of 25 μm and a ratio of 1 μm or less of 0.8% 0.1 parts of TMD and 0.5 of PPP
Parts, 0.5 parts of EDA, and finally 0.2 parts of a nonionic polymer flocculant were mixed to perform wet papermaking, and the basis weight was 75 g.
/ M ² of colored paper was prepared.

The properties of the coloring papers of Example 1 and Comparative Examples 1 to 3 are shown in Table 1, and the results of comparing the coloring performance are shown in Table 2.

[0027]

[Table 1]

[0028]

[Table 2]

[0029]

As described above, the coloring paper of the present invention uses three kinds of coloring agents, and controls the particle size and the hue of the coloring paper to identify the coloring of organic solvents such as chlorinated solvents, alcohols and amines. Very good in sex. Further, by adjusting the hue of the paper, it is possible to color-discriminate a trace amount of the organic solvent.

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) // G01N 33/52 G01N 33/52 B F term (reference) 2G042 AA01 BD02 BD04 BD13 BD20 CA10 CB03 DA08 FA11 FB07 FB08 FC01 FC09 HA08 2G045 AA40 BB25 CB30 DA74 DA80 FA11 FB11 FB17 GC12 HA10 HA14 2G054 AA02 AB07 CA30 CE02 EA06 GA03 GB04 GE06 4L055 AA02 AA03 AC06 AF21 AG35 AH01 EA08 EA11 EA16 EA29 FA30 GA50

Claims (7)

[Claims] (1) a bulk density of 0.1 g / cc or more and 1.0 g / c;
c or less, the thickness is 0.1 mm or more and 0.3 mm or less, shows at least one color when contacted with at least 0.01 μLt or more of an organic solvent, and the hue of the paper in the Munsell color system is Munsell Hue is in the range of 10.0R to 10.0Y and the lightness is Munsell Value 5.0 or more and 10.0
Hereinafter, color paper having a saturation of 0.5 or more and 5.0 or less in Munsell Chroma. 2. The coloring paper according to claim 1, further comprising a coloring agent which shows a different color when contacted with a chlorine-based solvent, alcohols, and amines. (3) The color former is 2,5,2 ', 5'TetraMethyltriphenylm
ethane-4,4'-Diazo-bis-β-hydroxynaphtoic anilid
(Hereinafter abbreviated as TMD), 4- (4'-Phenylazoyl) Phenylazo-
Phenol (hereinafter abbreviated as PPP) and Ethyl-bis- (2,4-D
The color paper according to any one of claims 1 to 2, wherein the color paper is at least one of initrophenyl) acetate (hereinafter abbreviated as EDA). 4. The coloring paper according to claim 1, wherein a powdery coloring agent having a particle size of 100 μm or less and a ratio of 1 μm or less of less than 1% by weight is used as the coloring agent. Manufacturing method. 5. The method for producing color paper according to claim 1, wherein a hue adjusting dye is added in addition to the colorant. 6. The color paper according to claim 1, wherein a coagulant is added to a mixed slurry of the pulp, the paper strength agent, the precipitant and the colorant to form a paper. 7. The method for producing colored paper according to claim 1, wherein fibrous polyvinyl alcohol is used as a paper strength enhancer.