JP5979975B2 - Masking material - Google Patents

Description

The present invention relates to a masking material used for coating a portion of the surface of the article that should not be subjected to surface treatment such as coating, etc., to protect it from the surface treatment. It is.

Conventionally, as a material for this type of masking material, for example, Patent Document 1 discloses a polymer alloy of an engineering plastic and another thermoplastic plastic, and Patent Document 2 discloses a polypropylene and polyethylene and / or ethylene. -A modified polypropylene blended with a propylene copolymer is disclosed, and Patent Document 3 discloses a thermoplastic resin sheet containing a copolymer component of acrylonitrile and styrene and / or methyl methacrylate, and a synthetic rubber component. Has been.
In the masking material, heat resistance is imparted by using engineering plastics such as polyphenylene ether (PPE), and molding is performed by mixing thermoplastics such as polyamide and synthetic rubber components such as styrene elastomers. Improves sex.

Japanese Patent No. 3573496 JP 2004-261627 A JP 2002-336748 A JP-A-6-192503 JP-A-5-93110 JP-A-8-41275

However, when a material having a hygroscopic property such as polyamide is used as the material of the masking material as the material for the masking material, it is easily affected by the humidity from the outside air during long-term storage and easily deforms. For this reason, in the case of a long-length masking material, a method of dividing and manufacturing in order to suppress the amount of deformation and joining the divided portions when used is employed. There is a problem that a plurality of molds for forming the divided portions are required, and it takes time and labor to join the plurality of divided portions, which increases the manufacturing cost.
Moreover, since the thing using the modification | denaturation polypropylene which mix | blended polyethylene and / or ethylene-propylene copolymer with the polypropylene for the said masking material is an olefin resin, it is inferior to the adhesiveness of process liquids, such as a coating material and an adhesive agent, for example . For this reason, means for improving the adhesion of the treatment liquid by applying primer treatment or corona discharge treatment to the surface of the masking material is adopted, but such treatment requires labor and the manufacturing cost is therefore reduced. In addition to the increase, the improvement in adhesion by the primer treatment or the corona discharge treatment is not permanent, and there is a problem that the adhesion of the treatment liquid is lowered by repeatedly using a masking material.
When a thermoplastic resin sheet containing a copolymer component of acrylonitrile and styrene and / or methyl methacrylate, such as ABS resin, and a synthetic rubber component is used as the masking material, the surface of the resulting masking material is particularly Since it is hard and may damage the surface of the article to be masked when attaching or removing the masking material, especially the painted surface, use it as a masking material to protect non-painted parts, for example. And there is a problem that usage is limited.
Moreover, although the thing of patent documents 4-6 is disclosed as a polymer alloy of an olefin resin and an acrylonitrile-butadiene-styrene resin, these are not mentioned about the use for a masking material of a polymer alloy, and Since it does not solve the specific problem required for masking materials to improve the adhesion of processing solutions while satisfying flexibility, elasticity and shape retention, the disclosed polymer alloy is applied to the masking materials as they are. I can't do it.

In order to solve the above problems, the present invention provides a surface layer and a back surface comprising a resin mixture in which acrylonitrile-butadiene-styrene resin and polypropylene are mixed so that the mass ratio is in the range of 20:80 to 60:40. A core layer made of a resin mixture in which a layer and polypropylene and polyethylene are mixed in a mass ratio of 98: 2 to 60:40;
Ri Na a three-layer sheet was molded into a predetermined shape, even in the core layer is to provide a masking material that is added fillers.
The thickness of the said surface layer and the said back layer is 0.01-0.05 mm, respectively, Comprising: The thickness of a surface layer and a back layer may be the same or different, The thickness of the said 3 layer lamination sheet whole is 0 .2
It is desirable to be -0.7 mm.
The polypropylene has a crystallinity measured by X-ray diffraction at 23 ° C. of 30% or more and an MFR (melt flow rate) measured at 230 ° C. of 0.01 to 300 g / 10 min. desirable.

[Action]
In the three-layer laminated sheet which is a material of the masking material of the present invention, acrylonitrile-butadiene-styrene resin (ABS resin) and polypropylene (PP) used for the surface layer and the back layer
) And polypropylene (PP) and polyethylene (PE) used for the core layer are both less hygroscopic, so that they are less likely to deform due to moisture absorption even after long-term storage. Therefore, even a long masking material can be molded integrally without the need for division.
The masking material is required to be flexible and elastic so as to be suitably attached to and removed from the article to be masked, and is preferably attached to the article so that it is not detached from the article during work. In order to maintain the shape, shape retention is required. However, simply improving the flexibility and elasticity makes the masking material soft and easy to attach to and remove from the article, while the masking material is easily removed from the article during work. In the case where the masking material is improved, the masking material becomes hard and it is easy to suppress desorption from the article during work, but it is difficult to attach to or remove from the article.
Furthermore, the masking material is required to have the treatment liquid adherent to the surface of the masking material so that the periphery of the masking material is not contaminated by the treatment liquid such as paint or adhesive.
Therefore, in the masking material of the present invention, by using a three-layer laminated sheet as the material,
The adhesiveness of the treatment liquid to the surface of the masking material is made favorable while making the flexibility, elasticity, and shape retention excellent.
That is, the core layer of the three-layer laminated sheet exhibits the flexibility, elasticity, and shape retention required for the masking material by using a polymer alloy of PP and PE as the material, but the polymer alloy of PP and PE Since it is an olefin resin, it is inferior in the adhesiveness of processing liquids, such as a coating material and an adhesive agent, for example. Therefore, the adhesion of the treatment liquid is improved by laminating a surface layer or a back layer using ABS resin and PP polymer alloy as materials on the core layer. The improvement in the adhesion of the treatment liquid due to the use of ABS resin and PP polymer alloy as a material is a permanent property of the polymer alloy, so that the primer treatment and corona discharge treatment can be performed. Unlike such an acquired one, the adhesiveness of the processing liquid is hardly lowered even when the masking material is repeatedly used. The polymer alloy of ABS resin and PP is PP and P
Since it is softer than E polymer alloy and is inferior in flexibility, elasticity, and shape retention, it is unsuitable for use in the core layer.
In addition, if the purpose is only to improve the adhesion of the treatment liquid on the masking material surface as described above, the surface layer or the back layer may be laminated only on either the front surface or the back surface of the core layer, In this case, the molded masking material is warped, and the shape retention is deteriorated. Therefore, the warp is suppressed by laminating the surface layer and the back layer on the front surface and the back surface of the core layer. Further, by laminating both the surface layer and the back layer, it is possible to prevent the hard core layer from coming into contact with the surface of the article to be masked and damaging the surface of the article.

It is said that the surface layer and back layer materials have good adhesion performance of the surface of the article while making the adhesiveness of the treatment liquid (e.g., paint) used for surface treatment on the article surface suitable. From the viewpoint, a resin mixture in which ABS resin: PP is 20:80 to 60:40 by mass ratio is used.
When the ratio of the mass ratio of the ABS resin is less than 20 and the ratio of the mass ratio of PP exceeds 80, the adhesion of the treatment liquid to the surface of the masking material is deteriorated, and the treatment liquid adhering to the masking material surface is reduced. By peeling off and scattering, the surroundings of the masking material may be contaminated.
On the other hand, if the ratio of the ABS resin exceeds 60 mass ratio and the ratio of the mass ratio of PP is less than 40, the masking material may be dissolved or swollen by the organic solvent contained in the treatment liquid (eg, paint). Further, the surface of the masking material becomes hard, and the surface of the article protected by the masking material may be damaged.

The core layer material is 98: 2 polypropylene (PP): polyethylene (PE) in mass ratio from the viewpoint of suitably maintaining the flexibility, elasticity, and shape retention required for the masking material.
A resin mixture of ˜60: 40 is used.
When the ratio of the mass ratio of PP exceeds 98 and the ratio of the mass ratio of PE is less than 2, the three-layer laminated sheet is hard and brittle, and thus the masking material is likely to have problems such as cracks and breakage.
On the other hand, when the ratio of the mass ratio of PP is less than 60 and the ratio of the mass ratio of PE exceeds 40, 3
The layer-laminated sheet becomes excessively flexible, the masking material cannot be suitably maintained in a molded shape, and is easily deformed by an external force, thereby hindering the mounting operation of the masking material.

〔effect〕
The masking material of the present invention has little moisture absorption even when stored for a long time and hardly deforms. Therefore, even if it is a long masking material, it is not necessary to divide and mold it, so it can be integrally molded, so the mold cost is also minimal The manufacturing cost is reduced. In the case of coating, since the coating film adheres to the surface and is difficult to peel off, it is possible to reliably prevent the peeling pieces of the coating film from being scattered around and causing contamination. Furthermore, the masking material of the present invention is difficult to dissolve and swell by the solvent of the paint,
The shape during use is stable and masking is performed reliably. Furthermore, since the masking material of the present invention has an appropriate hardness, it can be easily attached to / detached from the article to be masked, and is particularly resistant to repeated use.

The perspective view of the masking material of 1st Example. FIG. 5 is a cross-sectional view of the masking material of the first embodiment in the temporarily fixed state taken along line AA in FIG. 4. AA sectional view in FIG. 4 of the masking material of the first embodiment in a fixed state. The perspective view of the masking material of 1st Example attached to the pillar. The perspective view of the masking material of 2nd Example The perspective view of the masking material of 3rd Example The cross-sectional view which shows the attachment state of the masking material of 3rd Example. The longitudinal cross-sectional view which shows the attachment state of the masking material of 3rd Example. The perspective view of the masking material of 4th Example. The perspective view which shows the attachment state of the masking material of 4th Example. FIG. 11 is a cross-sectional view taken along line AA of the masking material of the fourth embodiment in FIG. 10. BB sectional drawing of the masking material of 4th Example in FIG. The perspective view of the instrument panel before painting and the masking material of 5th Example. AA sectional drawing of the masking material of 5th Example in FIG. The perspective view of the state which applied and applied the masking material of 5th Example. BB sectional drawing of the masking material of 5th Example in FIG. Perspective view of different color instrument panel The perspective view of the masking material of 7th Example The perspective view of the masking material of 8th Example

The present invention is described in detail below.
[Surface and back layers]
In the masking material of the present invention, the surface layer and the back layer are provided in order to satisfy the adhesion of the treatment liquid required for the masking material and the scratch resistance of the article surface to be masked.
Further, by providing both the front layer and the back layer with the core layer interposed therebetween, deformation of the masking material such as warpage is suppressed, and suitable shape retention is imparted to the masking material.
The materials for the surface layer and the back layer include acrylonitrile-butadiene-styrene resin (
ABS resin) and polypropylene (PP) in a mass ratio (ABS resin: PP) of 20:
A resin mixture that is mixed so as to be in the range of 80 to 60:40 is used. ABS
When the ratio of the mass ratio of the resin is less than 20 and the ratio of the mass ratio of PP exceeds 80, when the masking material is used for coating, the adhesion of the coating film formed on the surface of the masking material is increased. There is a possibility that the coating film formed on the surface of the masking material peels off and scatters as small pieces, and the painted portion around the masking material is soiled. On the other hand, if the ratio of the ABS resin exceeds 60 mass ratio and the ratio of the mass ratio of PP is less than 40, the masking material may be dissolved or swollen by the organic solvent contained in the treatment liquid (eg, paint). Further, the surface of the masking material becomes hard, and the surface of the article protected by the masking material may be damaged.
Examples of the ABS resin include (1) physical mixture of butadiene-acrylonitrile rubber and styrene-acrylonitrile resin, (2) graft polymer of acrylonitrile and styrene on butadiene rubber or butadiene-styrene rubber, (3) acrylonitrile, butadiene In the present invention, (1) to (3) are mentioned.
Any of these can be used.
Moreover, as ABS resin used for this invention, specific gravity is 1.03-1.08, tensile strength (A
STM D638) is 350 kgf / cm 2 (34.3 N / mm 2) to 700 kgf / c
m2 (68.6 N / mm2), flexural modulus (ASTM D790) is 15000 kgf /
It is preferable to select a material having a cm2 (1471 MPa) to 30000 kgf / cm2 (2942 MPa) and a heat distortion temperature (ASTM D648) in the range of 80 to 130 ° C.
As the PP, a PP homopolymer or a copolymer of propylene with some amount of other α-olefin such as ethylene can be used, and the crystallinity measured by an X-ray diffraction method at 23 ° C. Is 30% or more and the MFR (melt flow rate) measured at 230 ° C. is 0.
. It is preferable to select one in the range of 01 to 300 g / 10 minutes.

(Core layer)
In the masking material of the present invention, the core layer is provided to satisfy the flexibility, elasticity, and shape retention required for the masking material.
As the material of the core layer, a resin mixture obtained by mixing polypropylene (PP) and polyethylene (PE) so that the mass ratio (however, PP: PE) is within the range of 98: 2 to 60:40. used. When the ratio of the mass ratio of PP exceeds 98 and the ratio of the mass ratio of PE is less than 2, the three-layer laminated sheet becomes hard and brittle, and problems such as cracks and breakage are likely to occur in the masking material during use. . On the other hand, if the ratio of the mass ratio of PP is less than 60 and the ratio of the mass ratio of PE exceeds 40, the three-layer laminated sheet becomes excessively flexible, and the masking material cannot maintain the molded shape suitably, and external force As a result, the masking material is easily deformed, which hinders the mounting operation of the masking material.
As said PP, the thing similar to PP mentioned by the said surface layer and back layer is used.
As said PE, since a mixability with PP is favorable, a density is 0.910-0.9.
It is desirable to use 25 low density polyethylene (low density PE).

[Filler]
The upper relaxin layer, calcium carbonate, magnesium carbonate, barium sulfate, calcium sulfate, calcium sulfite, calcium phosphate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, magnesium oxide, titanium oxide, iron oxide, zinc oxide, Alumina, silica, diatomaceous earth, dolomite, gypsum, talc, clay, asbestos, mica, calcium silicate, bentonite, white carbon, carbon black, iron powder, aluminum powder, glass powder, stone powder, blast furnace slag, fly ash, cement, zirconia adding one or more kinds of inorganic filler powder and the like. Moreover, you may add 1 type, or 2 or more types of the said inorganic filler to the said surface layer and back layer, if desired. The amount of the inorganic filler added is usually in the range of 20 to 50% by mass.
The surface layer, back layer, core layer are further organic fillers such as linter, linen, sisal, wood powder, palm powder, walnut powder, den flour, wheat flour, cotton, hemp, bamboo fiber, palm fiber, wool, asbestos, Natural fibers such as kenaf fibers, polyamide fibers, polyester fibers, polyolefin fibers, acrylic fibers, vinyl chloride fibers, vinylidene chloride fibers and other synthetic fibers, viscose fibers, acetate fibers and other semi-synthetic fibers, asbestos fibers, glass fibers, carbon One or more fillers such as fibers, ceramic fibers, metal fibers, whiskers and other inorganic fibers may be added to improve shape retention, dimensional stability, compression and tensile strength, and the like. The filler is usually 0.05 to 20
About mass% is added.

[Layer thickness]
The thickness of the surface layer and the back layer is preferably set in the range of 0.01 to 0.05 mm. When the thickness of the surface layer and the back layer is less than 0.01 mm, the surface layer and the back layer are easily dissolved in the organic solvent if the treatment liquid contains an organic solvent. On the other hand, the thickness of the surface layer and the back layer is 0.
When it exceeds 05 mm, the surface of the masking material becomes hard and the surface of the article to be masked may be damaged.
The thickness of the surface layer and the thickness of the back layer are preferably substantially the same from the viewpoint of suppressing deformation such as warpage, but it is not necessarily required to be the same. The thickness and the thickness of the back layer may be different. When the thickness of the surface layer is different from the thickness of the back layer, it is preferable that one thickness is not more than twice the thickness of the other in order not to cause deformation such as warpage in the formed masking material. As an advantage when the thickness of the surface layer and the thickness of the back layer are different, for example, when using a paint containing an organic solvent as a treatment liquid,
For example, the surface layer can be made thicker than the back layer to improve durability against organic solvents.

[Three-layer laminated sheet]
The masking material of the present invention is a three-layer laminated sheet obtained by laminating the surface layer on the surface of the core layer and the back layer on the back surface of the core layer. It is obtained by molding into a predetermined shape.
The thickness of the three-layer laminated sheet is desirably set in the range of 0.2 to 0.7 mm. When the thickness of the three-layer laminated sheet is less than 0.2 mm, the three-layer laminated sheet is torn when the three-layer laminated sheet is formed into a predetermined shape by stretch molding such as vacuum and / or pressure forming. In particular, deep drawing becomes difficult.
When a masking material is attached to an object to be masked, an attachment portion of the masking material may be inserted into details such as a slit of the article, but the thickness of the three-layer laminated sheet is 0.7.
If it exceeds mm, it becomes impossible to insert the attachment portion of the masking material into the details.

Examples of the present invention will be described below.
[Example 1]
1 to 4 show a first embodiment of the present invention. The masking material 11 of the present embodiment is used for masking a columnar body such as a center pillar 12 of an automobile, for example.
The masking material 11 is formed along a U-shaped main body 11A in which a fitting portion 11B of the main body 12A of the center pillar 12 is formed inside, and lower edges of both side walls 11C and 11C of the main body 11A. Flange fitting portions 11D and 11D for fitting the flanges 12B and 12B of the center pillar 12 and backing portions 11E and 1 extending from the flange fitting portions 11D and 11D.
1E and the upper pad part 11F extended in the upper part, The main body 11A is formed with longitudinal reinforcing longitudinal ribs 11G and lateral transverse reinforcing ribs 11H.

The masking material 11 is the center pillar 12 formed by vacuum forming a three-layer laminated sheet.
It is obtained by molding into a shape corresponding to the shape such as.
The details of the three-layer laminated sheet are as follows.
Surface layer and back layer: A polymer alloy obtained by mixing ABS resin and PP at a mass ratio of 30:70, and 10% by mass of talc was mixed as a filler.
Core layer: A polymer alloy obtained by mixing PP and PE at a mass ratio of 98: 2, and 10% by mass of talc was mixed as a filler.
A three-layer laminated sheet having a thickness of 0.3 mm was obtained by extrusion molding the above materials from a T-die.

As shown in FIG. 2, the masking material 11 is configured such that the main body 12 </ b> A of the center pillar 12 is fitted into the fitting portion 11 </ b> B of the masking material 11, and further the flange 12 on the side edge of the center pillar 12.
B and 12B are fitted into the flange fitting portions 11D and 11D of the masking material 11, and temporarily fixed.
After the temporary fixing, as shown in FIG. 3, the backing portions 11E and 11E of the masking material 11
Is folded and applied to the backing 12C of the center pillar 12, and the backing portions 11E and 11E are fixed with an adhesive tape 14 or a tucker or the like.

As shown in FIG. 4, after the masking material 11 is attached to the center pillar 12 as described above, it is coated with the masking material 11 with a thermosetting melamine-alkyd resin paint or the like.

[Example 2]
As shown in FIG. 5, the masking material 21 of the second embodiment includes a U-shaped main body 21A in which a fitting portion 21B of the main body 22A of the center pillar 22 is formed inside, and both side walls 21C of the main body 21A. , 21C, flanges 22B, 22 of the center pillar 22 formed along the lower edge.
B includes flange fitting portions 21D and 21D for fitting B, backing portions 21E and 21E extending from the flange fitting portions 21D and 21D, and an upper backing portion 21F extending upward. A longitudinal reinforcing vertical rib 21G and a lateral reinforcing horizontal rib 21H are formed around 21A, but unlike the first embodiment, the longitudinal reinforcing vertical rib 21G is intermittent in this embodiment. ing.

The masking material 21 includes the center pillar 22 by vacuum forming a three-layer laminated sheet.
It is obtained by molding into a shape corresponding to the shape such as.
The details of the three-layer laminated sheet are as follows.
Surface layer and back layer: a polymer alloy obtained by mixing ABS and PP at a mass ratio of 40:60, in which 5% by mass of calcium carbonate and 0.1% by mass of carbon black were mixed as a filler.
Core layer: A polymer alloy obtained by mixing PP and PE at a mass ratio of 80:20, and 20% by mass of talc was mixed as a filler.
A three-layer laminated sheet having a thickness of 0.4 mm was obtained by extrusion molding the above materials from a T-die.

In the same manner as the masking material 11 of the first embodiment, the masking material 21 fits the main body 22A of the center pillar 22 to the fitting portion 21B of the masking material 21, and further the flange on the side edge of the center pillar 22 22B and 22B are flange fitting portions 21D of the masking material 21.
, 21D to be temporarily fixed, the backing portions 21E and 21E of the masking material 21 are folded back and applied to the backing of the center pillar 22, and the backing portions 21E and 21E are fixed with an adhesive tape or a tucker or the like. Wear and use. Then, the periphery of the center pillar 22 is painted together with the masking material (21) with a paint or the like.

Since the longitudinal reinforcing ribs 11G are continuous in the masking material 11 of the first embodiment, the masking material 21 of the present embodiment is easy to bend along the reinforcing longitudinal ribs 11G. Since 21G is intermittent, the bending rigidity is improved along the rib 21G.

Example 3
As shown in FIGS. 6 to 8, the masking material 31 of the third embodiment is attached to an air intake port 36 provided in the lower skirt portion 35 of the front bumper 34 when painting a car body 33 of an automobile.
On the inner side of the air inlet 36 of the skirt portion 35, vertical and horizontal reinforcing bars 36A, 36B,
A pair of left and right support columns 36C are provided. The masking material 31 includes the reinforcing bar 36A.
, 36B and vertical and horizontal fitting grooves 32A, 32B and fitting groove 3 for fitting the pillars 36C.
2C is formed, a flange 32D is formed on the peripheral edge of the front surface, and an adhesive layer 32E is further formed on the peripheral surface. The fitting grooves 32A, 32B, and 32C for fitting the reinforcing bars 36A and 36B and the column 36C also function as ribs for reinforcing the masking material 31.
At the intersection of the lateral (longitudinal) fitting groove 32B of the masking material 31 and the longitudinal (short direction) fitting groove 32A, the lateral fitting groove 32B is longer than the longitudinal fitting groove 32A. The reason why the height is formed so as to be higher is to improve the lateral rigidity of the masking material 31.
On the other hand, the vertical fitting groove 32C is formed higher than the horizontal fitting groove 32B at the intersection of the vertical fitting groove 32C and the horizontal fitting groove 32B. This is for improving the rigidity in the vertical direction.

The masking material 31 is obtained by forming a three-layer laminated sheet into a shape corresponding to the shape of the air intake port 36 or the like by vacuum forming.
The details of the three-layer laminated sheet are as follows.
Surface layer and back layer: a polymer alloy obtained by mixing ABS resin and PP at a mass ratio of 50:50, 15% by mass of calcium carbonate as a filler, 0.05% by mass of an antistatic agent,
0.1 mass% of antioxidant was mixed.
Core layer: A polymer alloy obtained by mixing PP and PE at a mass ratio of 70:30, and 5% by mass of talc was mixed as a filler.
A three-layer laminated sheet having a thickness of 0.5 mm was obtained by extrusion molding the above materials from a T-die.

The masking material 31 is fitted inside the air intake port 36, and the reinforcing bars 36 </ b> A and 36 </ b> B of the air intake port 36 are fitted into the fitting grooves 32 </ b> A and 32 </ b> B of the masking material 31.
6C is fitted into the fitting groove 32C. The masking material 31 is fixed inside the air intake port 36 by the adhesive layer 32E. Note that the adhesive layer 32E is not necessarily formed.
As described above, the masking material 31 is attached to the air intake port 36 of the skirt portion 35, which is a masking portion, and then the vehicle body 33 is coated, and the coating film is dried and cured by heat treatment after the coating.

Example 4
As shown in FIGS. 9-12, the masking material 41 of 4th Example is used for the masking of the window frame 44A of the door 44 of a motor vehicle.
The masking material 41 is composed of three members 41A, 41B, 41C having an L-shaped cross section,
Each member 41A, 41B, 41C is formed with a longitudinal reinforcing rib 41D in the longitudinal direction and a reinforcing lateral rib 41E in the short direction.

The masking material 41 is obtained by molding a three-layer laminated sheet into a shape corresponding to the shape of the window frame 44A or the like by vacuum / pressure forming.
The details of the three-layer laminated sheet are as follows.
Surface layer and back layer: A polymer alloy obtained by mixing ABS resin and PP at a mass ratio of 60:40, and 5% by mass of talc was mixed as a filler.
Core layer: A polymer alloy obtained by mixing PP and PE at a mass ratio of 60:40, and 15% by mass of talc was mixed as a filler.
A three-layer laminated sheet having a thickness of 0.2 mm was obtained by extrusion molding the above materials from a T-die.

In order to attach the masking material 41 to the window frame 44A of the door 44, the members 41A, 41B and 41C of the masking material 41 are brought into contact with the window frame 44A and the members 41A, 41B and 41C as shown in FIG. The connecting portions are overlapped with each other, and the connecting portions are fixed from above with an adhesive tape 42 or the like.
In this case, as shown in FIG. 11, in the connecting portion between the members 41A, 41B, 41C, the lateral rib 41E at one connection end is fitted to the lower side of the lateral rib 41E at the other connection end. 12, the upper edge flange 41F of each member 41A, 41B, 41C is hooked on the upper edge of the window frame 44A.
After painting, the masking material 41 is peeled off from the window frame 44A of the door 44. Since the window frame 44A of the door 44 is protected by the masking material 41, no paint film is formed on the window frame 22A.

Example 5
A fifth embodiment is shown in FIGS.
The instrument panel 52 of the automobile is divided into an upper part 52A and a lower part 52B. On the front surface of the instrument panel 52, a glove box mounting hole 55, audio mounting holes 56, 57, an instrument mounting portion 58, an accessory case mounting portion 59, and the like are provided.

As shown in FIG. 14, the instrument panel 52 includes a base material 54 and the base material 54.
It consists of a covering material (53) stuck on the surface. The surface covering material 53 includes a skin material 53A made of a nonwoven fabric, synthetic leather or the like, and a wadding material 53B such as a nonwoven fabric or a plastic foam sheet backed by the skin material 53A. The skin material 53A is colored in a predetermined color (base color), and the wadding material 53B can elastically change its thickness.
The base material 54 of the instrument panel 52 is provided with a concave groove 54A along the boundary between the upper part 52A and the lower part 52B, and the surface material 53 is formed at the concave groove 54A.
A parting line PL is formed by tightening into 4A. Above cover 5
3, the wadding material 53 </ b> B is compressed at the textured portion, and is fixed in the concave groove 54 </ b> A by its elastic restoring force.

The instrument panel 52 is made of the same upper and lower surface covering material 53 and therefore has the same upper and lower colors (base color). This may be attached to the automobile body as it is, but in order to make it different in color up and down, a masking material 51 as shown in FIG. 13 is used. The masking material 51 is
It has a shape that fits the upper part 52A of the instrument panel 52, and an engagement flange 51A is formed at the end edge.

The masking material 51 is attached to the upper part 52A of the instrument panel 52 as shown in FIG. 15, and the engaging flange 51A is inserted into the gap S of the parting line PL as shown in FIG. Fixed.
When the engaging flange 51A of the masking material 51 is inserted into the gap S of the parting line PL, the thickness of the wadding material 53B of the covering material 53 is compressed, and the engaging flange 51A is made to be elastic by the elastic restoring force. It is pinched by and fixed.

After the masking material 51 is attached to the upper part 52A of the instrument panel 52, the lower part 52B of the instrument panel is painted differently from the upper part 52A by spray painting or the like. After painting, the masking material 51 is removed. In this way, an instrument panel 52 having different colors as shown in FIG. 17 can be easily obtained.

The masking material 51 is obtained by molding a three-layer laminated sheet into a shape corresponding to the shape of the upper portion 52A of the instrument panel 52 by pressure forming or press forming.
The details of the three-layer laminated sheet are as follows.
Surface layer and back layer: a polymer alloy obtained by mixing ABS resin and PP at a mass ratio of 20:80, and 10% by mass of talc and 1% by mass of carbon black were mixed as a filler.
Core layer: A polymer alloy obtained by mixing PP and PE at a mass ratio of 65:35, and 5% by mass of talc was mixed as a filler.
A three-layer laminated sheet having a thickness of 0.7 mm was obtained by extrusion molding the above materials from a T-die.

Example 6
It is a masking material having the same shape as the masking material of Example 1, and is obtained by vacuum forming a three-layer laminated sheet.
The details of the three-layer laminated sheet are as follows.
Surface layer and back layer: a polymer alloy obtained by mixing ABS resin and PP at a mass ratio of 30:70, and 10% by mass of talc and 0.2% by mass of carbon black were mixed as fillers.
Core layer: A polymer alloy obtained by mixing PP and PE at a mass ratio of 95: 5, and 10% by mass of talc was mixed as a filler.
A three-layer laminated sheet having a thickness of 0.4 mm was obtained by extrusion molding the above materials from a T-die .

The masking material of the present invention has little moisture absorption even when stored for a long time and hardly deforms. Therefore, even if it is a long masking material, it is not necessary to divide and mold it, so it can be integrally molded, so the mold cost is also minimal The production cost is reduced, and in the case of painting, the coating film adheres to the surface and it is difficult to peel off, so it is reliably prevented that the peeling pieces of the coating film scatter around and cause contamination, Furthermore, since it is difficult to dissolve and swell by the solvent of the paint, the shape during use is stable,
Since it has an appropriate hardness, it can be easily attached to / detached from an article to be masked, and particularly has high resistance in repeated use, so that it can be used industrially.

11, 21, 31, 41, 51, 61, 71 Masking material

Claims (3)

A surface layer and a back layer composed of a resin mixture obtained by mixing acrylonitrile-butadiene-styrene resin and polypropylene in a mass ratio of 20:80 to 60:40;
A core layer made of a resin mixture obtained by mixing polypropylene and polyethylene in a mass ratio of 98: 2 to 60:40;
Rename the three-layer laminated sheet is formed into a predetermined shape is,
Further masking material in the core layer, characterized that you have been added inorganic filler. The thickness of the said surface layer and the said back layer is 0.01-0.05 mm, respectively, Comprising: The thickness of a surface layer and a back layer may be the same or different, The thickness of the said 3 layer lamination sheet whole is 0 .2
The masking material according to claim 1, which is ˜0.7 mm. The polypropylene has a crystallinity of 30% or more measured by X-ray diffractometry at 23C and an MFR (melt flow rate) measured at 230C of 0.01 to 300 g / 10 min. The masking material according to claim 1 or 2.

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