JP2002071661A - Coloring paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide coloring paper easily allowing color identification to a trace quantity of an organic solvent such as a chlorine solvent, alcohol and amine even in the presence of water, particularly assuming the case of flowing out in drainage. 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, thickness in a range of 0.1 mm to 0.3 mm and the Steckigt sizing degree of paper 100 sec or longer. The color identification paper turns red when coming in contact with the chlorine solvent of at least 0.01 μLt or more, 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 test paper capable of distinguishing a mist or a liquid chemical. In particular, the present invention relates to a test paper capable of instantaneously identifying the type of a chemical that is a trace amount of an organic solvent having a different property without using an analyzer or a special technique.

[0002]

2. Description of the Related Art As a device for easily identifying a liquid chemical, for example, a PH test paper or the like capable of measuring 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 test paper that can instantly identify the type of organic solvent.

[0003] The identification of the organic solvent species is empirically based on its color,
The reality is that we make an estimate based on viscosity, odor, solubility with other compounds, etc., and then identify by chemical analysis or instrumental analysis.

[0004] For example, in a method based on chemical analysis, there is a method in which Cl ₂ obtained by a flask combustion method of a chlorine-containing organic substance is collected and then a redox reaction is used. For the amine, a coloration method using quinhydrone may be mentioned. For alcohol, coloration due to formation of a coordination compound in cerium ammonium nitrate and HNO ₃ acidity 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, appropriate measures can be taken by measuring the pH with a pH test paper or the like and neutralizing the pH. 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.

[0006] In recent years, as awareness of global environmental conservation has increased, it is necessary to promptly treat erroneously leaked chemicals in order to prevent chemicals from leaking out of business facilities. It is rare.

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a method for removing trace amounts of solvents such as chlorinated solvents, alcohols, and amines, especially in the presence of water, assuming that the solvent may flow into wastewater.
An object of the present invention is to provide a color test paper which can easily and instantaneously identify and identify a color.

[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 characterized by being in the range of 10.0R or more and 10.0Y or less, and the lightness is in the range of 5.0 or more and 10.0 or less in Munsell Value, and the saturation is in the range of 0.5 or more and 5.0 or less in Munsell Chroma. It is a color test paper, and the bulk density of the paper is 0.1 g / cc or more and 1.0 g / cc or less, the thickness is 0.1 mm or more and 0.3 mm or less,
The degree of size is 100 seconds or more, and red when contacted with a chlorinated solvent, yellow when contacted with alcohol,
And a color test paper characterized by exhibiting a dark green blue color when contacted with amines, and the amount of the organic solvent used in the color test paper is at least 0.01 μLt or more. is there.

Further, as a coloring agent for coloring, a particle size of 10
A color test paper characterized in that a powdery colorant having a ratio of 0 μm or less and 1 μm or less is less than 1% is used.

[0010] Further, when paper is made by the inner surface size method, a slurried mixture of pulp, paper strength enhancer, fixing agent and sizing agent, or precipitant and colorant powder is formed, and then a coagulant is added to make the paper. The present invention relates to a method for producing a color test paper according to claim 1.

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

The test paper has a hue in the Munsell color system.
10.0R or more, 10.0Y or less, preferably in the range of 5.0YR or more, 5.0Y or less, and the lightness is 5.0 or more, 10.0 or less, preferably, 6.5 or more, 8.5 or less, and the saturation is 0.5
The range is not less than 5.0 and preferably not less than 1.0 and not more than 3.0. In other cases, there is a tendency that the discriminability at the time of coloring is deteriorated.

The color test paper has a bulk density of 0.1 g / c.
c, not less than 1.0 g / cc, preferably 0.3 g / cc
cc or more and 0.6 g / cc or less, and the thickness is 0.1 mm or more and 0.3 mm or less, preferably 0.1 mm or more.
5 mm or more and 0.20 mm or less. The bulk density is 0.
If it is less than 1 g / 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.
On the other hand, paper exceeding 1.0 g / cc tends to be difficult to produce. 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.

It is desirable that the color test paper has a paper Stechig sizing degree of 100 seconds or more, preferably 200 seconds or more. If the time is less than 100 seconds, it tends to be difficult for the test paper to be colored with a trace amount of solvent when wet with water.

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'TetraMethyltrip
henylmethane-4,4'-Diazo-bis-β-hydroxynaphtoic ani
lid (hereinafter abbreviated as TMD), 4- (4'-Phenylazoyl) Phenyla
zo-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 or an amine-based solvent, when the liquid adheres to the color test paper, TMD dissolves only in the chlorine-based solvent and turns red, It informs that the adhering droplet is a chlorine-based solvent. In addition, when the attached liquid is alcohol, the vibration of the electrons makes the PPP deeper, and the color test paper develops a yellow color to notify that the attached droplet is alcohol. Similarly, when the adhering liquid is an amine solvent, the charge is transferred to a benzene ring, so that the color test paper develops a green color to inform that the adhering droplet is an amine solvent.

It is sufficient that the amount of the organic solvent contacting the color test paper is at least 0.01 μLt or more.
Below this, the determination tends to be difficult, but conversely, the effect is the same if too much is applied. It is sufficient that the organic solvent adheres to the color paper together with the water.

In the color test paper, the colorant has a particle size of 1 μm or more and 100 μm or less, and preferably 5 μm or more and 7 μm or more.
Those having a size of 5 μm or less are desirable. Coloring agent particle size is 100μ
If it exceeds m, the coloration of the trace amount of solvent will be difficult to distinguish, and if it exceeds 1 μm, the background color of the paper will be dark and the lightness will be dark, making it difficult to distinguish the coloration of the trace amount of organic solvent. Cannot obtain the desired color test paper.

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 color test paper is prepared by adding TMD, which is a color former, to 0.1%.
It is desirable to contain 2% by weight or more and 2.0% by weight or less, 1.0% by weight or more and 10.0% by weight or less of PPP, and 1.0% by weight or more and 10.0% by weight or less of EDA. .
If the content of the coloring agent is small, it is difficult to identify the color when the color is formed, so that it is difficult to identify.If the content is large, the background color of the paper is dark and the lightness is dark, so that a trace amount of the solvent is colored. It is difficult to identify the color test paper, so that the color test paper aimed at by the present invention cannot be obtained.

[0021]

Examples are shown below.

[0022] The paper's Stechicht size is JIS P8
The measurement was performed based on the “Steechicht sizing degree test method for paper” specified in 122. The higher the value, the higher the water resistance of the paper.

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 the coloration performance, tetrachloroethylene (chemical A) was used in a standard state (leaved at 20 ° C. and RH 60%) and in a state wetted with water (immersed in water at 20 ° C. for 30 minutes). , Isopropyl alcohol (Chemical B) and dimethylamine (Chemical C) were dropped 0.5 and 0.01 μLt, respectively, and the coloring performance was judged to be acceptable when the color developed within 5 seconds after dropping was evaluated as ○. The sample was identified as red, yellow, and green after 5 seconds from the dropping, and was judged as acceptable 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) After mixing 0.01 parts of RBY7GL (Ray7GL manufactured by Arakawa Chemical Co., Ltd.), 5 parts of aluminum sulfate and 5 parts of white rosin (Size Pine N-771 manufactured by Arakawa Chemical) are mixed in order. next,
After mixing 5 parts of an antifoaming agent (Homeless P0 manufactured by Meisei Chemical Co., Ltd.), the average particle diameter was previously dispersed in water using a dispersant (Disper TL manufactured by Meisei Chemical Co., Ltd.) five times as large as the colorant. 0.7 parts of TMD, 5 parts of PPP, and 5 parts of EDA having a ratio of 0.8% of 25 μm and 1 μm or less are mixed, and finally, 0.2 parts of an anionic polymer flocculant (PAM) is mixed to prepare wet papermaking. The color test paper having a basis weight of 75 g / m ² was prepared.

Example 2 A wet papermaking was performed according to the same formulation as in Example 1, and the basis weight was 100 g / m 2.
² color test papers were prepared.

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 fibrous binder, 0.01 part of yellow dye, 5 parts of sulfuric acid band and 5 parts of white rosin, 5 parts of defoamer, and 5 times dispersant in advance of colorant 25 μm average particle size dispersed in water using
And the ratio of 1 μm or less is 0.8%
Parts, 5 parts of PPP, 5 parts of EDA and 0.2 parts of anionic polymer coagulant are mixed at a time to perform wet papermaking, and the basis weight is 75 g.
/ M ² was prepared.

Comparative Example 2 NBK having the same degree of beating degree as SR-15 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, 5 parts of aluminum sulfate and 5 parts of white rosin are mixed in order. Next, after mixing 5 parts of the defoaming agent, 5
14 μm average particle size dispersed in water using double dispersant
And the ratio of 1 μm or less is 15%
, 5 parts of PPP and 5 parts of EDA, and finally 0.2 part of an anionic polymer flocculant was mixed to perform wet papermaking, thereby producing a color test paper having a basis weight of 75 g / m ² .

Table 1 shows the properties of the color test papers of Examples 1 and 2 and Comparative Examples 1 and 2, and Table 2 shows the results of comparison of the color performance.
Shown in

[0030]

[Table 1]

[0031]

[Table 2]

[0032]

As described above, the color test paper of the present invention uses three types of colorants, and controls the particle size and hue of the color test paper to display an organic solvent such as a chlorinated solvent, alcohol, or amine. Very good color discrimination. Further, since it has extremely high water resistance, it is possible to color-discriminate a trace amount of an organic solvent even in the presence of a large amount of water, for example, when an organic solvent flows out into drainage or the like.

Claims (5)

[Claims] 1. A colored paper having a water resistance of at least 0.01 .mu.Lt in which an organic solvent can be recognized to develop a color and a Steckigt sizing degree of 100 seconds or more. 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. A pulp, a paper strength agent, a fixing agent, a sizing agent,
The color paper according to any one of claims 1 to 3, wherein the papermaking is performed by adding a flocculant to a mixed slurry of the precipitant and the colorant. 5. A color test paper comprising the color paper according to claim 1.