JP6399785B2 - Masking tape for shot blasting - Google Patents

Description

The present invention relates to a masking tape that is used when an old paint is peeled off by shot blasting when a paint surface is repainted or when a base surface treatment is performed on the paint surface.

Shot blasting is applied to rust removal, paint removal, and ground treatment. Shot blasting is a process of scraping off the coating surface or metal surface, and the structural strength of the object whose surface has been scraped off may change. Therefore, masking is performed on parts that are not blasted, such as bolt parts.

When the masking is wide, a rubber sheet or a thick film sheet is used, but an adhesive tape is used to fix the sheets.

In order to prevent the adhesive tape from being completely destroyed by shot blasting, losing the masking effect and damaging the substrate, or to prevent the curing sheet from being fixed, generally a thick adhesive tape is applied in double or triple. Yes.

If the masking range is narrow, masking is done only with adhesive tape. Also in this case, in order to prevent the adhesive tape from being completely destroyed and losing the masking effect, a thick adhesive tape is used, and it is affixed in double or triple. A cloth tape is often used as a thick adhesive tape.

When sticking the adhesive tape, cut the adhesive tape by hand to prevent the workers from tearing and scratching the workpiece. Therefore, it is important for the masking operation that the adhesive tape can be easily cut by hand.

During the shot blasting operation, the abrasive surface collides with the construction surface, which heats up the construction surface. Therefore, the adhesive tape needs to have heat resistance. However, fabric tapes frequently used for shot blast masking have many rubber adhesives and insufficient heat resistance, and therefore, adhesive residue may be generated after construction, which may contaminate the workpiece.

Therefore, before applying the cloth tape, a Japanese paper tape using an acrylic pressure-sensitive adhesive having good heat resistance may be applied to the base.

In this way, masking is performed by attaching a Japanese paper tape to the base and further applying a cloth tape in double or triple, which is very laborious.

Further, if the pressure-sensitive adhesive remains on the workpiece after peeling off the pressure-sensitive adhesive tape, it is necessary to take a measure to remove the pressure-sensitive adhesive, which is troublesome.

The above-mentioned ideas used as masking tape for shot blasting are as follows.
Adhesive tape applied to vulcanized rubber sheet. It has poor cutting properties and is not suitable for masking fine parts. (Patent Document 1)
Adhesive tape using a durable film substrate. Although it is excellent in the cut-out property when cutting with a cutter, it is difficult to cut by hand. (Patent Document 2)

JP-A-6-55447 JP 2007-331076 A

In the masking process of shot blasting, the present invention eliminates the need for overlapping tapes and can be easily cut by hand to greatly improve the work efficiency. There is no adhesive tape related.

The present inventor arrived at the present invention as a result of intensive studies to solve the problems in the previous term.
That is, the present invention has a bead particle layer prepared by applying and drying a binder containing bead particles on one side of a synthetic resin nonwoven fabric substrate having a thickness of 100 μm or more as a tape substrate. And a masking tape for shot blast surface treatment having a heat-resistant adhesive layer on the opposite surface of the bead particle layer. Moreover, in the masking tape for shot blast surface treatment of the present invention, the bead particles are one or more selected from glass beads, hard urethane resin beads, hard melamine resin beads, hard urea resin beads, and a binder. A water-dispersed acrylic binder having a heat-resistant pressure-sensitive adhesive layer on the opposite surface of the bead particle layer, and a release agent layer can be provided on the bead particle layer.
Furthermore, in the masking tape for shot blast surface treatment of the present invention, it is preferable to use a polyester-based nonwoven fabric having orthogonal fiber orientation as the synthetic resin nonwoven fabric substrate.
In the masking tape for shot blast surface treatment of the present invention, an acrylic pressure-sensitive adhesive is preferably used as the heat-resistant pressure-sensitive adhesive layer.

According to the present invention, it is possible to greatly improve the masking work that has been troublesome because a plurality of adhesive tapes have been pasted and pasted, and the adhesive tape was also pasted when the adhesive tape was removed. Since the surface is not contaminated by residual adhesive, the work efficiency of the surface treatment process by shot blasting can be greatly improved as a whole.

An example of sectional drawing masked with the adhesive tape for shot blast surface treatment of the present invention. An example of sectional drawing masked with the adhesive tape for shot blast surface treatment of the present invention.

As the tape base material used in the present invention, a synthetic resin nonwoven fabric is suitable, and a nonwoven fabric with good hand cutting properties is more preferable. As such a nonwoven fabric, JX Nippon Oil & Energy Corporation (polyester nonwoven fabric) is known.

Moreover, the synthetic resin nonwoven fabric which is a tape base material used by this invention uses what was impregnated normally. The impregnation treatment agent is usually used by being dissolved or dispersed in a solvent (including water), but the use form is not particularly limited.

There are no particular restrictions on the components, for example, natural rubber, acrylic rubber, butyl rubber, butadiene rubber, isobutylene rubber, styrene-butadiene copolymer rubber, styrene-butadiene-styrene copolymer rubber, styrene-isoprene copolymer rubber. , Styrene-isoprene-styrene copolymer rubber, acrylonitrile-butadiene copolymer rubber, acrylonitrile-butadiene-isoprene copolymer rubber, butadiene- (meth) acrylic acid copolymer rubber, butadiene- (meth) acrylic acid ester copolymer rubber, ( (Meth) acrylic acid grafted natural rubber, (meth) acrylic acid ester grafted natural rubber, styrene grafted natural rubber, acrylonitrile grafted natural rubber, synthetic isoprene rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene Polymer rubber, ethylene-vinyl acetate copolymer rubber, ethylene- (meth) acrylic acid copolymer rubber, ethylene- (meth) acrylic ester copolymer rubber, ethylene-acrylonitrile copolymer rubber, polyether urethane rubber, polyester urethane rubber, Synthetic rubbers such as silicone rubber, liquid isoprene rubber, liquid butadiene, liquid styrene-butadiene copolymer rubber, liquid acrylonitrile-butadiene copolymer rubber, liquid oxypropylene rubber, shellac, polyvinyl alcohol, polyvinyl butyral, Resin such as polyvinyl acetate, polyvinyl chloride, (meth) acrylic acid copolymer, (meth) acrylic acid ester copolymer, (meth) acrylic acid, (meth) acrylic acid ester, (meth) acrylonitrile, hydroxy ( Meta Acrylate, vinyl acetate, vinyl chloride, styrene, such as at least 2 or more copolymerizable resin selected from the group consisting of monomers having N- alkylol groups and N- alkoxyalkyl group.

As the impregnating agent, an elastomer having a functional group such as a halogen group, a chlorosulfone group, a carboxyl group, a hydroxyl group, an amino group, or an epoxy group is also used. Specifically, chlorobutyl rubber, bromobutyl rubber, chloroprene rubber, epichlorohydrin rubber, chlorinated polyethylene, chlorosulfonated polyethylene, carboxylated acrylonitrile-butadiene copolymer rubber, liquid chloroprene rubber, liquid carboxylated polyisoprene rubber, liquid carboxylated polybutadiene And liquid hydroxylated polyisoprene, liquid hydroxylated polybutadiene rubber, and liquid aminated polybutadiene rubber.

These impregnating agents may be random bodies, block bodies, graft bodies or their modified bodies, and may be used alone or in combination of two or more.

Moreover, about the thing with the high intensity | strength of a synthetic resin nonwoven fabric, it can use without an impregnation process.

The present invention forms a bead particle layer by adding bead particles such as glass beads, hard urethane resin beads, hard melamine resin beads, and hard urea resin beads to a binder, coating the substrate, and drying. Thus, it is possible to obtain a flexible masking tape for shot blast surface treatment. Any binder can be used as long as it allows the beads to adhere to the substrate, and a commercially available water-dispersed acrylic binder can be suitably used. By forming the bead particle layer, the base material can withstand the collision of the abrasive by shot blasting.

The powdered hard resin to be added is at least one kind of powdered hard resin selected from glass beads, hard urethane resin beads, hard melamine resin beads, hard urea resin beads, and the like, preferably glass beads and hard melamine resin beads.

  It is possible to maintain the flexibility of the base material by using a powdered hard resin instead of a film-like hard substance, and to wind up in a roll shape as the final form. Become.

The hardness of the beads is preferably 4 or more (Mohs hardness: Note: quartz 7). The particle size is preferably 10 to 500 μm, more preferably 25 to 200 μm.

When the particle diameter is large, it becomes difficult to apply a thin film of the binder, and the tape becomes thick. As the thickness of the tape increases, the cut by hand decreases.

The tape base material has an orthogonal fiber orientation excellent in cutability because it needs to be unwound from a tape in which a sheet having a width of 10 mm to 100 mm is wound into a roll shape and cut to an appropriate length. The aspect ratio is preferably 4: 1 or less.

As the pressure-sensitive adhesive for the pressure-sensitive adhesive tape of the present invention, a heat-resistant one is used. A cohesive force that can withstand the heat generated by the collision of the abrasive during shot blasting is required. In an uncrosslinked rubber-based pressure-sensitive adhesive, cohesive failure due to heat occurs, and adhesive residue is generated when the tape is removed. Therefore, a crosslinked rubber-based pressure-sensitive adhesive or acrylic pressure-sensitive adhesive is preferable.

The rubber-based adhesive is not particularly limited as long as it is a conventionally known rubber-based adhesive, natural rubber, butyl rubber, butadiene rubber, isobutylene rubber, styrene-butadiene copolymer rubber, styrene-butadiene-styrene copolymer rubber, Styrene-isoprene copolymer rubber, styrene-isoprene-styrene copolymer rubber, acrylonitrile-butadiene copolymer rubber, acrylonitrile-butadiene-isoprene copolymer rubber, methyl methacrylate natural rubber, styrene graft natural rubber, acrylonitrile graft natural rubber, synthetic Isoprene rubber, ethylene-propylene copolymer rubber, ethylene-propylene-diene copolymer rubber, ethylene-vinyl acetate copolymer rubber, ethylene-acrylate copolymer rubber, ethylene-acrylonitrile copolymer rubber Butadiene- (meth) acrylic acid ester copolymer rubber, polyether urethane rubber, polyester urethane rubber, liquid isoprene rubber, liquid butadiene, liquid styrene-butadiene copolymer rubber, liquid acrylonitrile-butadiene copolymer rubber, liquid oxypropylene rubber, etc. Can be mentioned.

The acrylic pressure-sensitive adhesive is not particularly limited. For example, (A) an alkyl alkyl ester having 4 to 12 carbon atoms and / or an alkyl methacrylate having 4 to 18 carbon atoms in the alkyl group. 85 to 98.9% by weight, (B) a monomer mixture consisting of 0.1 to 5% by weight of an α, β-unsaturated carboxylic acid, or an amount not exceeding 40 parts by weight with respect to 100 parts by weight of the monomer mixture Examples thereof include a polymer obtained by polymerizing a monomer mixture obtained by blending a monomer copolymerizable with a component.

The tape substrate is Japanese paper, crepe paper, biodegradable plastic film or ordinary plastic film, and non-woven fabric is particularly preferable. Examples of the nonwoven fabric include polyester nonwoven fabric, rayon nonwoven fabric, and polyolefin nonwoven fabric. The thickness is selected in the range of 25 to 300 μm, preferably in the range of 75 to 250 μm.

The tape base material can be cut by hand, and preferably has an orthogonal property. In order to adjust the orthogonality, a nonwoven fabric having a two-layer structure is preferable.

The thickness of the pressure-sensitive adhesive layer is selected in the range of 20 to 200% of the tape base material thickness, preferably in the range of 20 to 200 μm.

The adhesive strength of the adhesive tape is 1.0 N / 10 mm or more, preferably selected in the range of 1.0 N / 10 mm to 5.0 N / 10 mm, more preferably selected in the range of 1.5 N to 3.0 N / 10 mm. Is done.

The adhesive strength here is measured according to JIS Z0237. Specifically, it is a SUS304 steel plate having a thickness of 2 mm or more, a width of about 50 mm, and a length of about 125 mm as defined in JIS G 4305. Using spring-polished paper as a test plate, a test piece with a width of 25 mm and a length of 250 mm is pasted in an atmosphere of a temperature of 23 ± 2 ° C. and a relative humidity (50 ± 5)%, and a spring specified in JIS K6253 Using an automatic crimping device of a roller having a hardness of about 45 mm, a diameter of about 95 mm including the rubber layer, and a mass of 2,000 ± 50 g, coated with a rubber layer having a hardness of 80 ± 5 Hs and a thickness of about 6 mm, a speed of about This is a load obtained by peeling a piece that has been pressure-bonded at 5 mm / s and 1 reciprocation at 180 degrees and at a speed of about 300 mm / s.

The thicker the adhesive layer, the better the shot blast durability and the better the followability to the adherend, but the sticking out of the adhesive from the side of the tape becomes severe, causing problems with tape appearance and workability. To do. There may also be a problem with adhesive residue when removing the tape.

The structure of the pressure-sensitive adhesive tape used in the present invention is composed of a release agent layer, a tape base material, and a pressure-sensitive adhesive layer. A release agent is applied to the side surface to form a release agent layer. By doing in this way, even if it winds a long adhesive tape, a release agent layer will cover an adhesive layer surface, and it can unwind easily.

(Adjustment of tape base material)
A tape base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Energy (lifetime polyester) as a raw fabric having a thickness of 100 to 150 μm.
(Coating agent adjustment)
100 parts by mass of Potters Barotini's multi-glass beads as an additive was added to 100 parts by mass of DIC Corporation Boncoat R-3310-E, which is a water-dispersed acrylic binder, to obtain a sufficiently stirred coating agent a.
(Manufacture of adhesive tape)
JX Nippon Mining & Energy Co., Ltd. A tape base material a obtained by impregnating Milife with an acrylic resin, DIC Co., Ltd. Boncoat R-3310-E / Potters Ballotini Multi Glass Beads = 100 / 100 binders were applied so that the substrate after drying was 200 to 250 μm. Furthermore, the acrylic pressure-sensitive adhesive a is applied so that the thickness of the tape after drying is 250 to 300 μm, and the silicone release agent is applied on the surface opposite to the surface where the pressure-sensitive adhesive is applied last. It was applied so as to be 0.5 g / m ² , wound after drying, and an adhesive tape a was obtained.

About the obtained adhesive tape, adhesiveness, shot blast durability, and heat resistance were evaluated.
Adhesive strength: The adhesive strength to the SUS plate was measured according to JIS Z0237.
Heat resistance: Affixed to a SUS plate, heated to a predetermined temperature, then peeled off the tape, and visually confirmed that there was no adhesive residue.

Practical test 1:
Create a sheet of tape width 50mm x length 100mm, affix it to SUS, use sand as a projection material, projecting pressure 0.4Mpa / cm, perform 5 reciprocating sandblasting, then peel off the tape, The state was confirmed visually.

○: After sandblasting, the tape is peeled off, and the surface state of the SUS plate is the same as before masking.
Δ: After sandblasting, the tape is peeled off, and the SUS plate is not damaged, but the adhesive remains.
X: After sandblasting, the tape is removed and the SUS plate is scratched. Or there is a scratch on the SUS plate and the adhesive remains.

Practical test 2:
○: Can be easily cut by hand.
Δ: It takes time to cut by hand.
X: It is difficult to cut by hand.

Practical test 3:
Masking work time ○ ・ ・ ・ Can be done in a short time.
Δ: Can be done in a short time.
× ・ ・ ・ Take time.

(Adjustment of tape base material)
A tape base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Energy (lifetime polyester) as a raw fabric having a thickness of 100 to 150 μm.
(Coating agent adjustment)
100 parts by mass of melamine resin beads of Potters Barotini Co., Ltd. as an additive was added to 100 parts by mass of DIC Corporation Boncoat R-3310-E, which is a water-dispersed acrylic binder, to obtain a sufficiently stirred binder b.
(Manufacture of adhesive tape)
The binder b was applied to the tape base material a so that the thickness after drying was 300 to 400 μm, and a bead particle layer was prepared. Apply the acrylic pressure-sensitive adhesive a on the surface opposite to the surface coated with the binder so that the thickness of the tape after drying is 400 to 450 μm, and further dry the silicone release agent on the surface coated with the binder The coating amount was 0.5 g / m ² and wound up after drying to obtain an adhesive tape b.

(Comparative Example 1)
(Adjustment of tape base material)
A tape base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Energy (lifetime polyester) as a raw fabric having a thickness of 100 to 150 μm.
(Coating agent adjustment)
DIC Corporation Boncoat R-3310-E 100 parts by mass of Potters Barotini's multi-glass beads as an additive was added to 100 parts by mass to obtain a sufficiently stirred coating agent a.
(Manufacture of adhesive tape)
The binder a is applied to the tape substrate a so that the thickness after drying is 200 to 250 μm, and the thickness of the tape after drying the rubber adhesive b on the surface opposite to the surface coated with the binder is 250 to 300 μm. Then, a silicone release agent was applied to the surface coated with the binder so that the coating amount after drying was 0.5 g / m ^2, and wound up after drying to obtain an adhesive tape c.

(Comparative Example 2)
(Adjustment of tape base material)
A tape base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Energy (lifetime polyester) as a raw fabric having a thickness of 100 to 150 μm.
(Manufacture of adhesive tape)
100 parts by mass of DIC Corporation coating agent Boncoat R-3380-E, which is a water-dispersible acrylic binder, is applied to the tape substrate a so that the thickness after drying is 200 to 250 μm, and the surface of the surface coated with the binder is applied. Acrylic pressure-sensitive adhesive a is applied to the opposite surface so that the thickness of the tape after drying is 250 to 300 μm, and the silicone-based release agent is applied to the surface on which the coating agent is applied. and m ^2, and the coating dried winding, to obtain a pressure-sensitive adhesive tape d.

(Comparative Example 3)
(Adjustment of tape base material)
A tape base material a was obtained by impregnating an acrylic resin using JX Nippon Oil & Energy Energy (lifetime polyester) as a raw fabric having a thickness of 100 to 150 μm.
(Manufacture of adhesive tape)
Acrylic pressure-sensitive adhesive a is applied to tape substrate a so that the thickness of the tape after drying is 180 μm, and the silicone release agent is applied on the surface opposite to the surface where the pressure-sensitive adhesive is applied. It was applied so as to be 5 g / m ² , wound after drying, and an adhesive tape e was obtained.

(Comparative Example 4)
(Adjustment of tape base material)
A Japanese paper having a thickness of 70 μm was used as a raw fabric, and an acrylic resin was impregnated to obtain a tape base material b.
(Coating agent adjustment)
100 parts by weight of Potters Barotini's multi-glass beads as an additive was added to 100 parts by weight of DIC Corporation Boncoat R-3310-E, which is a water-dispersed acrylic binder, to obtain a sufficiently stirred binder a.
(Manufacture of adhesive tape)
The binder a is applied to the tape base material b so that the thickness after drying is 200 μm, and the thickness of the tape after drying the rubber adhesive b is 250 μm on the surface opposite to the surface coated with the binder. The silicone-based release agent was applied to the surface coated and further coated with a binder so that the coating amount after drying was 0.5 g / m ^2, and wound up after drying to obtain an adhesive tape f.

About the obtained adhesive tape, adhesive force, heat resistance, and practicality were evaluated and shown in Table 1.

1. 1. Impregnated tape base material Bead particle layer
3. 3. Adhesive layer Release agent layer

The shot blast surface treatment pressure-sensitive adhesive tape of the present invention can perform shot blast surface treatment efficiently, so it can be used for many parts manufacturing processing and surface finishing of finished products, and has extremely high industrial utility value. .

Claims (4)

Using a synthetic resin nonwoven fabric substrate having a thickness of 100 μm or more as a tape substrate, a bead particle layer formed by applying and drying a binder containing bead particles on one side of the synthetic resin nonwoven fabric substrate, Masking tape for shot blast surface treatment having a heat-resistant adhesive layer on the opposite side. The bead particles are one or more selected from glass beads, hard urethane resin beads, hard melamine resin beads, and hard urea resin beads, and the binder is a water-dispersed acrylic binder, and the opposite surface of the bead particle layer to have heat-sensitive adhesive layer, further, a masking tape for shot blasting surface treatment as set forth in claim 1, Ru provided a release agent layer on the bead particles layer. The masking tape for shot blast surface treatment according to claim 1 or 2, wherein the synthetic resin nonwoven fabric base material is a polyester-based nonwoven fabric having an orthogonal fiber orientation. The masking tape for shot blast surface treatment according to any one of claims 1 to 3, wherein the heat-resistant adhesive layer is an acrylic adhesive.

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