JPH0862388A - X-ray shielding laminate - Google Patents

Abstract

(57) [Abstract] [Purpose] Not only has a good X-ray shielding ability, but it is not bulky or stiff when used, and it is easy to reduce weight and size, and the thickness of the X-ray shielding layer can be controlled. Provided is an X-ray shielding laminate which is easy and has excellent manufacturing efficiency. An X-ray shielding layer 4 composed of an X-ray shielding coating agent obtained by mixing a metal component having a certain X-ray shielding ability and a binder component is provided on a substrate, and the X-ray shielding layer 4 is further provided. The sealing layer 5 is provided on the top to form the X-ray shielding laminate 1 including three or more layers.

Description

Detailed Description of the Invention

[0001]

The present invention relates to an X-ray shielding laminate,
For example, the present invention relates to an X-ray shield laminate that can be used as a packaging material that is preferably used to store a film or the like that is susceptible to X-rays.

[0002]

2. Description of the Related Art Non-destructive tests using X-rays have come to be performed in various fields because it is possible to know the internal state of a test object without destroying the test object. At airports, X-ray fluoroscopy is performed on passenger baggage in order to prevent dangerous goods from being brought into the aircraft.

However, while the X-ray fluoroscopic examination has the above-mentioned advantages, there is a drawback that the functions of films, cameras, various transistor products, pharmaceuticals and the like may be impaired by the influence of X-rays. ing.

Therefore, in order to protect the above-mentioned articles susceptible to X-rays from X-rays, an X-ray shielding bag using a laminate having an X-ray shielding layer has been put into practical use. In other words, in this X-ray shielding bag, items such as films, cameras, various transistor products, and pharmaceuticals that are easily affected by X-rays are stored, and the stored items are subjected to X-ray fluoroscopy in that state so that the stored items can be removed from the X-rays. To protect.

The layer structure of the X-ray shielding laminate used in the conventional material for forming the X-ray shielding bag is, for example, base material /
A four-layered structure composed of a base material / X-ray shielding layer / seal layer is known.

[0006]

However, in the conventional X-ray shielding laminate, since the X-ray shielding layer is formed of lead foil, it is bulky and stiff during use, and it is lightweight and compact. There is a problem that is difficult. Furthermore, in order to control the thickness of the X-ray shielding layer, there is a manufacturing inconvenience that a lead foil having a desired thickness must be prepared as needed.

The present invention has been made in view of the above circumstances, and an object of the present invention is that it is free from bulkiness and stiffness during use, can be easily reduced in weight and size, and has a reduced thickness of the X-ray shielding layer. An object is to provide an X-ray shielding laminate that is easy to control and has excellent manufacturing efficiency.

[0008]

In order to solve the above-mentioned problems, the X-ray shielding laminate of the present invention is a laminate comprising a base material, an X-ray shielding layer and a sealing layer and having a layer structure of three or more layers. The X-ray shielding layer is formed of an X-ray shielding coating agent containing a metal component and a binder component, and the metal component has an atomic number Z of a constituent metal of the metal component and a density ρ [g. cm ⁻² ], Z · ρ> 1,000.

[0009]

The X-ray shielding laminate of the present invention is a laminate having a layer structure of three or more layers having a base material, an X-ray shielding layer and a sealing layer, and the X-ray shielding layer is a metal component and a binder component. And an atomic number of the constituent metal of the metal component is Z and the density is ρ [g · cm ⁻² ], Z · ρ>
It satisfies 1,000.

Here, regarding the X-ray absorption characteristics of a metal, when the X-ray quality is the same, the absorption coefficient becomes larger and the X-ray transmittance decreases as the metal becomes heavier and the atomic number becomes larger. That is, the absorption coefficient μ of the substance for X-rays of wavelength λ
Is the following formula: μ = C · λ ³ · Z · ρ [cm ³ ] (where C is a constant, λ is the wavelength, Z is the atomic number, and ρ is the density of the substance. The above Z · ρ value is Z · ρ> 100.
In the X-ray shielding laminate of the present invention, which has an X-ray shielding layer made of an X-ray shielding coating agent containing a metal component satisfying 0, X-rays are absorbed in the X-ray shielding layer. The transmittance is reduced, and as a result, X-rays are shielded by this X-ray shield laminate.

Further, since such an X-ray shielding layer is formed by coating the substrate with an X-ray shielding coating agent, the thickness of the X-ray shielding layer can be easily adjusted by adjusting the coating thickness. It is controllable.

[0012]

Next, an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the X-ray shielding laminate 1 according to the present embodiment includes a first base material layer 2, a second base material layer 3, and an X-ray shielding layer 4.
The sealing layer 5 and the sealing layer 5 are laminated in this order to form a four-layer structure, and an anchor coat agent or an adhesive agent is appropriately used for adhesion between the layers.

The first base material layer 2 together with the second base material layer 3 is X
This layer has a function or a function of supporting the line shielding layer 4 and the seal layer 5, and is a layer on which printing is performed as necessary. Examples of the material for forming the first base material layer 2 having such an action or function include drawn polyester, drawn polypropylene, and drawn polyamide.

The thickness of the first base material layer 2 cannot be uniformly determined because it varies depending on the use and purpose of this X-ray shielding laminate, but for example, this X-ray shielding laminate is X-ray shielding. When it is used as a material for forming a bag, it is usually 8 to 50 μm, preferably 15 to 40 μm.

A second base material layer 3 is laminated on the first base material layer 2. As described above, the second base material layer 3 has a function or function of supporting the X-ray shielding layer 4 and the seal layer 5 together with the first base material layer 2, and further includes the metal component of the X-ray shielding layer 4. This layer has a function or function of hiding coloring.

Examples of the material for forming the second base material layer 3 include colored films such as white polyethylene, white polyester, and white polypropylene. Similarly to the thickness of the first base material layer 2, the thickness of the second base material layer 3 differs depending on the use and purpose of the X-ray shielding laminate, and therefore cannot be uniformly determined. When the ray-shielding laminate 1 is used as the material for forming the X-ray shielding bag, it is usually 2
It is 0 to 50 μm, preferably 30 to 40 μm.

In this embodiment, the base material is the first base material layer 2
The second base material layer 3 and the second base material layer 3 have two layers, but the base material may have only one layer or three or more layers, depending on the use and purpose of the X-ray shielding laminate 1. .

As shown in FIG. 1, an X-ray shielding layer 4 is laminated on the second base material layer 3. The X-ray shielding layer 4 has a function or function of absorbing X-rays and preventing X-rays from passing through the X-ray shielding laminate 1.

The X-ray shielding layer 4 is formed by applying an X-ray shielding coating agent on the second base material layer 3.
The X-ray shielding coating agent used for forming the X-ray shielding layer 4 contains a metal component and a binder component, and the metal constituting the metal component has an atomic number Z and a density ρ [g · c].
m ⁻² ], Z · ρ> 1,000 is satisfied.

Here, as the above-mentioned metal whose Z · ρ value exceeds 1,000, for example, W (Z · ρ value: 1,42
8.2), Ir (Z · ρ value: 1,732.5), Pt
(Z · ρ value: 1,673.1), Au (Z · ρ value: 1,
526.28) and the like.

The metal component is preferably used in a materially stable oxide state so that the curing rate of the binder component does not become too fast. The binder component is used as a vehicle by being divided into uses such as an overcoat agent, an adhesive, and a pressure-sensitive adhesive.

Specific examples include a resin binder component, an elastomer binder component, a natural binder component and the like. Among the above resin binder components, examples of thermosetting binder components include urea-based, melamine-based, resorcinol-based, phenol-based (water-soluble, alcohol-soluble, novolac), epoxy-based, polyurethane-based, polyaromatic-based ( Polyimide, polybenzimidazole, polyamideimide, etc.), polyester type (alkyd type, unsaturated polyester, diallyl phthalate type, polyester acrylate, acrylic acid diester, etc.) and the like. Examples of thermoplastics include vinyl acetate-based (emulsion, solution), polyvinyl alcohol-based, polyvinyl acetal-based (butyral, acetal, formal, etc.), vinyl chloride-based,
Acrylic type (emulsion, solution, reactive type), polyolefin type (PE, EVA, etc.), cellulose type (cellulose, nitrocellulose, cellulose acetate, ethyl cellulose, water-soluble cellulose, etc.), silicone type, polyacrylamide type, polyvinyl methyl ether type , Polyisobutylene-based, polyvinyl ether and the like.

As the elastomeric binder component,
For example, chloroprene rubber type (solution, latex), nitrile rubber type (solution, latex), SBR type, styrene-ethylene-butylene block copolymer (SEBS)
System, styrene-isoprene block copolymer (SIS)
System, styrene-butadiene block copolymer (SBS)
System, polysulfide system, butyl rubber system, silicone rubber system (RTV type, vulcanization type, pressure sensitive type), isobutylene rubber system, isoprene rubber system, butyl rubber system and the like.

Examples of the mixed system include phenolic vinyl type, epoxy phenol type, phenol chloroprene type, phenol nitrile type, epoxy polyamide type, epoxy polysulfide type, nitrile epoxy type and epoxy type. Examples include nylon.

Examples of the natural binder component include natural rubber-based binders. As a particularly preferable binder component, an OH compound may be mentioned, and it may be used alone or as a mixture of a few kinds. At this time, isocyanate (NCO) is used as a curing agent.

Examples of the solvent for such an X-ray shielding coating agent include toluene and methyl ethyl ketone (ME
K), ethyl acetate, butyl acetate, xylene, methyl isobutyl ketone (MIBK), isopropyl alcohol (IPA) and the like.

For example, the mixing ratio of each component in the X-ray shielding coating agent using these solvents is usually 20 to 70 parts by weight for the metal component and 10 for the binder component.
-30 parts by weight, and the solvent is usually 20-60 parts by weight.

The ratio (P / V ratio) between the pigment (P) and the vehicle (V) in this X-ray absorbing coating agent.
Is usually 40 to 90, preferably 70 to 80.
When the P / V ratio is as high as 60 or more, various precipitation inhibitors may be used.

X formed by applying this X-ray shielding coating agent
The dry thickness of the line shielding layer 4 is usually about 10 to 60 μm, preferably about 30 to 50 μm. A seal layer 5 is provided on the X-ray shielding layer 4.

The sealing layer 5 has a heat-sealing property. For example, when an X-ray shielding bag is produced using this X-ray shielding laminate 1, the sealing layers 5 are heat-sealed at predetermined portions. The seal layer 5 is an X-ray shielding layer 4 containing a metal component.
Has the function or function of hiding the coloring of

As a material for forming such a seal layer 5, a polyolefin resin having a sealing property can be mentioned. Specifically, for example, low-density polyethylene (high-pressure method low-density polyethylene, linear low-density polyethylene, etc.), medium-density polyethylene and high-density polyethylene can all be used. In addition to ethylene homopolymer, ethylene and propylene, butene-1, pentene-
It is also possible to use a copolymer with an α-olefin such as 1 or vinyl acetate, or a mixture thereof. In the propylene-based resin, a random copolymer of propylene and an α-olefin such as ethylene, butene-1, pentene-1, 3-methylbutene-1, 4-methylpentene-1 or a mixture thereof has a particularly low temperature sealing property. It is mentioned as an excellent one.

Further, the sealing layer 5 is made of barium (B
a) The compound may be contained. When the seal layer 5 contains a barium (Ba) compound, this X-ray shielding laminate 1
The X-ray shielding effect due to is further improved. That is, when the sealing layer 5 contains a barium (Ba) compound, such a sealing layer 5 has an action or function of assisting X-ray shielding.

The thickness of the seal layer 5 is usually 30 to 80 μm.
m, preferably 40 to 80 μm. X with the above configuration
The ray-shielding laminated body 1 is a film,
It can be suitably used as a material for forming an X-ray shielding bag for accommodating articles susceptible to X-rays such as cameras, various transistor products, and pharmaceuticals, and protecting these articles from X-rays.

Next, the present invention will be described more specifically by showing experimental examples of the present invention. Experimental Example 1 Preparation of X-ray Shielding Coating Agent Acrylic Polyol (Heating Residue 50%, OH Number 30) 1
Toluene and methyl ethyl ketone (MEK) in a mixture of 3 parts by weight, 6 parts by weight of vinyl chloride and 1 part by weight of cellulose.
20 parts by weight each, rotation speed 1,200 rp
While stirring with a mixer of m, 80 parts by weight of tungsten trioxide (Z · ρ value of W: 1,428.8) was added little by little and sufficiently dispersed to obtain 140 parts by weight of an X-ray shielding coating agent sample solution. It was

Next, an isocyanate curing agent [XEL curing agent (D) manufactured by The Inktech Co., Ltd.] was used for the sample liquid and the isocyanate curing agent, and the ratio of the binder component to the isocyanate curing agent in the sample liquid was adjusted. (Binder component) /
(Isocyanate curing agent) was mixed so as to be 100/5, and this was stirred to obtain an X-ray shielding coating agent coating liquid. Preparation of X-ray shielding laminate and X-ray shielding bag A polyethylene (PE) film having a thickness of 80 μm was coated with the above coating solution by comma coating, and 40
Curing is performed under the condition of 48 ° C for 48 hours to prepare three kinds of samples with coating thicknesses of 15 μm, 30 μm and 45 μm, and a milky white polyethylene film with a thickness of 35 μm and biaxial stretching with a thickness of 25 μm on the coated surface of each sample. Polyethylene terephthalate film is attached in this order and 3 types of X
An X-ray shielding bag was prepared by making a X-ray shielding laminate and bag-making each X-ray shielding laminate. Non-destructive inspection test Film sensitivity of ISO400 35
Store the mm film and put it on the X-ray non-destructive testing machine,
The X-ray shielding ability was evaluated according to the following four grades.

The results are shown in Table 1. A: No damage to the film B: Partially damaged film C: 1/5 to 1/2 of the film was damaged D: More than half of the film was damaged The test conditions of the inspection test are as follows.

Tester used: EV-150 manufactured by Unihight Co., Ltd. Tube voltage: 70 kv Tube current: 3 mA

[0038]

[Table 1] Comparative Example 1 In the above-mentioned Experimental Example 1, 80 parts by weight of tungsten trioxide was replaced with barium sulfate (Z · ρ value of Ba: 202.
72) An X-ray shielding coating agent coating solution was prepared in the same manner as in Experimental Example 1 except that 80 parts by weight was used.
An X-ray shielding laminate and an X-ray shielding bag were prepared in the same manner as in Experimental Example 1, and a nondestructive inspection test was performed. The results are shown in Table 1. Experimental Example 2 Preparation of X-ray Shielding Coating Agent Acrylic Polyol (Heating Residue 50%, OH Number 16) 3
2.5 parts by weight, 15 parts by weight of vinyl chloride and cellulose and 2.
50 parts by weight of toluene and 50 parts by weight of methyl ethyl ketone (MEK) were added to 5 parts by weight of the mixture, and the rotation speed was 1.
While stirring with a mixer of 200 rpm, 50 parts by weight of tungsten trioxide (Z · ρ value of W: 1,428.8) was added little by little and sufficiently dispersed to obtain 200 parts by weight of an X-ray shielding coating agent sample solution. It was

Next, an isocyanate curing agent [XEL curing agent (D) manufactured by The Inktech Co., Ltd.] was used as the sample liquid and the isocyanate curing agent, and the ratio of the binder component to the isocyanate curing agent in the sample liquid was adjusted. (Binder component) /
(Isocyanate curing agent) was mixed so as to be 100/5, and this was stirred to obtain an X-ray absorbing coating agent coating liquid. Preparation of X-ray Shielding Laminate and X-Ray Shielding Bag Except for using the above-mentioned coating liquid, the coating thickness of the coating liquid was 3 μm, that is, 15 μm, 30 μm and 45 μm, in the same manner as in Experimental Example 1. An X-ray shielding laminate was prepared, and each X-ray shielding laminate was formed into a bag to form an X-ray shielding bag. Nondestructive inspection test The X-ray shielding ability of each X-ray shielding bag was evaluated in the same manner as in Experimental Example 1 except that the above X-ray shielding bags were used.

The results are shown in Table 1. Comparative Example 2 In the experiment example 2, barium sulfate (Z · ρ value of Ba: 202.
72) An X-ray shielding coating agent coating solution was prepared in the same manner as in Experimental Example 2 except that 50 parts by weight was used.
An X-ray shielding laminate and an X-ray shielding bag were prepared and a nondestructive inspection test was conducted in the same manner as in Experimental Example 2. The results are shown in Table 1. Comparative Example 3 A polyethylene (PE) film having a thickness of 75 μm has a thickness of 5
A 0 μm lead foil is attached, and a 35 μm thick milky-white polyethylene film and a thickness of 25 μm are laminated on the lead foil.
The biaxially stretched polyethylene terephthalate film of 1 was attached in this order to form an X-ray shielding laminate, and the X-ray shielding laminate was manufactured into a bag to form an X-ray shielding bag.

The X-ray shielding bag thus obtained was evaluated for X-ray shielding ability in the same manner as in Experimental Example 1. The results are shown in Table 1.
Shown in Examination of Results As is apparent from Table 1, the X-ray shielding ability of the X-ray shielding bags obtained by using the X-ray shielding laminates obtained in Experimental Example 1 and Experimental Example 2 is the same in Comparative Example 1 and Comparative Example. X obtained in 2
It was confirmed that the X-ray shielding bag using the X-ray shielding laminate was superior to the X-ray shielding ability.

The X-ray shielding ability of the X-ray shielding bag formed by using the X-ray shielding laminate obtained in Comparative Example 3 is the same as that obtained in Experimental Examples 1 and 2. Although it was slightly superior to the X-ray shielding bag of the X-ray shielding bag, it was bulky and stiff when used, and the feeling of use was greater than that of the X-ray shielding bag of Experimental Example 1 and Experimental Example 2. It was much worse. From this, it was confirmed that the X-ray shielding bags using the X-ray shielding laminates obtained in Experimental Example 1 and Experimental Example 2 had better usability than conventional products.

[0043]

As described in detail above, the X-ray shielding laminate of the present invention comprises an X-ray shielding coating agent containing a binder component and a metal component having a certain or more X-ray shielding ability. As it has a structure that has a X-ray shielding layer, it has excellent X-ray shielding ability, and when used, for example, when the bag is used, it is not bulky or stiff, and has an excellent feeling of use. Moreover, an X-ray shielding coating agent is applied. The thickness of the X-ray shielding layer can be easily controlled only by adjusting the thickness, and the manufacturing efficiency is excellent.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of an X-ray shielding laminate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... X-ray shielding laminated body 2 ... 1st base material 3 ... 2nd base material 4 ... X-ray shielding layer 5 ... Seal layer

Claims (1)

[Claims] 1. A laminate comprising a base material, an X-ray shielding layer, and a sealing layer, the laminate having three or more layers, wherein the X-ray shielding layer contains a metal component and a binder component. It is formed by a coating agent, and the metal component has an atomic number Z of a constituent metal of the metal component and a density ρ [g · cm ⁻² ].
The X-ray shielding laminate is characterized in that Z · ρ> 1,000.