JPH07975B2 - Shading net - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-shielding net that is used by being attached to a window glass surface of an automobile, a building or the like for shielding light.

2. Description of the Related Art Conventional products used for the purpose of reducing incident light and preventing internal see-through on window glass surfaces of automobiles and buildings can be roughly classified into paper type and translucent film type. All of these are sheet-like materials.

The paper type has a sufficient effect of reducing incident light and preventing internal see-through due to the opacity and diffuse reflection of the material, but it has no visibility from the inside to the outside and has poor fashionability.

Further, the semi-transparent film type is a film with good see-through efficiency mixed or adhered with a coloring agent or a reflecting agent, and has an effect of reducing incident light and preventing internal see-through,
The outlook is not clear due to the effects of additives, the thickness of the film and the adhesive, and the effects of air bubbles, and it has the drawback of being poor in fashionability because it is simply colored on the glass surface.

Further, a major drawback common to all of these sheet-like materials is that it is very difficult to apply the adhesive to the window glass surface because wrinkles and bubbles are likely to enter, and it is almost impossible if the surface is curved.

Under such a background, a light-shielding material for plate glass adhesion is disclosed in which a net-like body made of a thermoplastic resin, natural fiber or the like is subjected to resin processing or gluing processing to impart rigidity, and an adhesive layer is provided on the surface thereof. (Japanese Patent Laid-Open No. 59-8892).

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above shading material for plate glass adhesion, the material of resin processing for imparting rigidity to the mesh is not clear, but generally, workability and performance are excellent, and it is relatively inexpensive. Polyvinyl chloride resin is used. However, polyvinyl chloride resin usually contains a plasticizer such as phthalate ester, adipate ester, and phosphate ester. When the adhesive layer is formed on this polyvinyl chloride resin, the plasticizer is Even if it exists, it migrates to the surface with the passage of time, significantly weakening the adhesive strength of the adhesive to glass etc., and finally peeling off, causing a serious problem.

In addition, the gluing process has a weak grading effect, and is very likely to be misaligned at the time of handling or processing after adhesion, and it is difficult to maintain an orderly appearance of the reticulated body.

The present invention solves the above-mentioned problems, has no change in adhesive strength over time, can be detached and reused, and has three functions of reducing incident light, preventing internal see-through, and providing a clean view from the inside. It is an object of the present invention to provide a light-shielding net which can be easily adhered to curved surfaces as well as to be curved.

Means for Solving the Problems In order to solve the above-mentioned problems, the light-shielding net of the present invention provides a resin that does not contain a plasticizer to the thread forming the net body, and an adhesive layer on one side of the net body. Is provided.

In the present invention, the material of the yarn forming the net body is not particularly limited, and any of inorganic fibers such as glass fibers and organic fibers such as polyester fibers, nylon fibers, polypropylene fibers, rayon fibers can be used. . The net formed from the threads made of these fibers may be woven, knitted, or bonded, and the shape of the net can be selected from square (square), rhomboid, and hexagonal. Regarding the size of the mesh of the net, for example, a cover warp and a weft crossover shape with a cover factor K of 100 to 500 may be used. This cover factor K is
It is the sum of the weft cover factors K _W and K _F , and is calculated by the following formulas (1) to (3) as warp and weft density N _W and N _F (pieces / inch) and tex counts T _dW and T _dF. .

K = K _W + K _F (1) When the cover factor K is less than 100, the functions of reducing incident light and preventing internal see-through are low, and when the cover factor K is more than 500, it tends to be difficult to clearly see the inside from the outside.

Examples of the resin that does not include a plasticizer that can be applied to the yarn forming the net body include polymethyl acrylate resin, polyvinyl acetate resin, melamine resin, polyurethane resin,
Examples thereof include phenol resin, epoxy resin, copolymers and mixtures thereof. These resins are organic solvent solutions or aqueous dispersions (hereinafter referred to as resin solutions)
As the net body, it is impregnated or coated and applied to the yarn without blocking the eyes. The amount of resin applied to the thread is appropriately determined depending on the type and thickness of the raw material fiber of the thread, the size of the net, the type of resin, etc. within the range that gives the rigidity necessary for attaching to the window glass surface. However, it is usually 10 to 40%, and if added excessively, it will be difficult to attach it to a curved glass surface such as a net with a plate-like shape, and the degree of eye opening will decrease. Therefore, it should be avoided. The resin liquid is black, blue, silver white,
You can add fashion by adding yellow, red or any other color to the net to impregnate it with resin liquid.
The treatment such as coating may be carried out twice or more. For example, after first impregnating the resin solution colored in black and applying it, the silver-white resin solution may be coated on one side,
You can also draw a pattern on it to enhance fashion.

The pressure-sensitive adhesive layer provided on one side of the net body in which the resin is applied to the thread can be formed by using a conventionally known pressure-sensitive adhesive, for example, styrene-butadiene rubber, natural rubber, ethylene-vinyl acetate copolymer. It is formed by coating one side of the net body with a mixture of a substance, an elastomer such as polybutyl acrylate, and a tackifier (solvent) such as rosin, terpene, xylene without blocking the eyes.

Action In the above configuration, the resin forming no net plasticizer is added to the threads forming the net body to give a certain rigidity, and the adhesive force of the adhesive layer provided on one side to the surface to be attached However, at or below the heat deterioration temperature of the pressure-sensitive adhesive, there is no or almost no change, so there is no peeling from the surface to be adhered during use, and it can be detached and reused. Even if it is stored for a long time, the adhesive strength does not change, and since it is a net, even if the surface to be adhered is a flat surface or a curved surface, it is easy to attach without sticking air bubbles during attachment. In addition, it is possible to perform a clear view from the inside, reduce incident light, and prevent internal see-through.

Examples Examples of the present invention will be described below.

Example 1. Glass yarn CG150-1 / 2-3.8S (E; E glass, C; long fiber, G: filament diameter 9 μm, 150; 1/100 of yardage per pound; twin yarn , 3.8SiS twist number / 25mm) with a fiber density of 20 / inch, weft 20 / inch, plain weave design (cover factor K
= 328) net body was woven. This net body,
Immersed in a mixed aqueous dispersion of poly (methyl acrylate) resin, melamine resin and carbon black, squeezed and dried, and 21% by weight of the resin containing no plasticizer in the glass yarn as solid matter without blocking the eyes. Attached. On one side of this black net body, an aqueous dispersion of a polymethyl acrylate resin containing no plasticizer and an aluminum pigment was further roll-coated, and dried to allow the resin and the aluminum pigment to adhere to a solid content of 4% by weight. It was Next, a pressure-sensitive adhesive layer containing butyl polyacrylate as a main component was provided on the silver-white colored surface to obtain a light-shielding net having appropriate rigidity that was easy to stick to the glass surface.

Example 2. A net body woven in the same manner as in Example 1 above was dipped in a mixed aqueous dispersion of a polyurethane resin and carbon black, squeezed and dried, and a plasticizer was added to the glass yarn without blocking the eyes. 18% by weight of the resin containing no solid matter
Attached. On one side of this black net body was further roll-coated an aqueous dispersion of polymethyl acrylate containing no plasticizer and an aluminum pigment, which was dried to deposit 5% by weight of the resin and the aluminum pigment as a solid content. Next, a pressure-sensitive adhesive layer containing an ethylene-vinyl acetate copolymer as a main component was provided on the silver-white colored surface to obtain a light-shielding net having appropriate rigidity that was easy to stick to the glass surface.

Comparative Example A net body woven in the same manner as in Example 1 above was dipped in a mixed aqueous dispersion of a polyvinyl chloride resin containing dioctyl phthalate as a plasticizer and carbon black, squeezed and dried to close the eyes. 21% by weight of the above resin with a plasticizer added was added as solid matter to the glass thread.
On one side of the black net body, an aqueous dispersion of a polymethyl acrylate resin containing no plasticizer and an aluminum pigment was further roll-coated and dried to allow the resin and the aluminum pigment to adhere to a solid content of 4% by weight. It was Then, a pressure-sensitive adhesive layer mainly composed of polybutyl acrylate was provided on the silver-white colored surface to obtain a light-shielding net having appropriate rigidity that was easily attached to the glass surface.

The light-shielding nets obtained in the above-mentioned Examples 1, 2 and Comparative Example were attached to a polyethylene terephthalate (PET) film having a thickness of 12 μm on the surface provided with the adhesive layer and put in a room at 35 ° C. After 2 months and 2 months at room temperature and 80 ℃,
The peel strength per 25 mm width was measured under the condition after standing for 24 hours. The results are shown in Table 1.

The peel strength was measured by the following method.

Prepare three test pieces with a width of 25 mm and a length (longitudinal direction) of 250 mm,
After the tensile test, peel off the PET film by 30mm, fix the test piece on the upper chuck, fix the PET film on the lower chuck, crosshead speed 300mm / min, peeling distance 200mm
The tensile stress was measured with and the average value of three test pieces was obtained.

As is clear from the results shown in Table 1, the light-shielding nets of Examples 1 and 2 using the resin not containing the plasticizer were compared with those of the comparative example using the resin containing the plasticizer. There was almost no change with time in the adhesive strength due to the adhesive layer, and it was very stable.

EFFECTS OF THE INVENTION As described above, in the light-shielding net of the present invention, the thread forming the net body is provided with the resin containing no plasticizer, and the one side surface of the net body is provided with the pressure-sensitive adhesive layer. Since the adhesive strength of the adhesive layer to the surface to be adhered is not affected by migration or leaching of the plasticizer as in the case of using a resin containing a conventional plasticizer, there is no or almost no change. It does not peel off from the surface to be adhered during use, can be detached and reused, and the adhesive strength does not change even when unused and stored for a long time. It adheres well to the shape of the attachment surface, has no problem of air bubble mixing, has moderate rigidity, and can be easily attached, and reduces incident light, prevents internal see-through, and Very clean outlook from It is extremely useful as a light-shielding material for window glass surfaces of automobiles and buildings, etc.

Continuation of the front page (56) References JP-A-59-8892 (JP, A) JP-A-1-207376 (JP, A) Actual opening 59-44898 (JP, U) Actual opening Sho-58-125023 (JP , U) Shunsuke Murahashi, Ryohei Oda, Sou Imoto, "Revised New Edition Plastic Handbook" (Sho 48-7-10) Asakura Shoten P. 426

Claims (1)

[Claims] 1. A light-shielding net, characterized in that a resin not containing a plasticizer is applied to the threads forming the net body, and an adhesive layer is provided on one side of the net body.