JPH1036800A - Rubber pressure-sensitive adhesive - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber-based pressure-sensitive adhesive excellent in initial adhesive strength and water resistance for bonding a building material to a rough surface such as concrete, calcium silicate plate, gypsum board, wood and the like. . SOLUTION: 100 parts by weight of a rubber component comprising at least one of polyisobutylene, butyl rubber and halogenated butyl rubber, a mercaptosilane compound and / or
Alternatively, it comprises 0.5 to 30 parts by weight of an alkylalkoxysilane compound having an alkyl group having 4 or more carbon atoms.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber-based pressure-sensitive adhesive excellent in water resistance for bonding a building material to a rough surface such as concrete, calcium silicate plate, gypsum board, wood and the like in the field of construction.

[0002]

2. Description of the Related Art Conventionally, nails and bolts have been mainly used for joining various building materials to rough surfaces such as concrete, calcium silicate boards, gypsum boards, and wood, and surfaces to which dust is attached. However, if a nail or a bolt is used, a hole is formed in the material, and the hole becomes a starting point of distortion, and the material is easily broken. In addition, there is a problem that noise is generated and the finished appearance is not good.

[0003] For this reason, a bonding method using an adhesive has been adopted. However, if an adhesive is used, it is necessary to press the material against the adherend until the initial adhesive strength is developed, and the working efficiency is not good. In addition, the use of a solvent-type adhesive causes problems such as danger of ignition due to an organic solvent and deterioration of a working environment.

In recent years, pressure-sensitive adhesive tapes having a pressure-sensitive adhesive layer provided on both sides or one side of a base sheet in place of the above-mentioned adhesive have been widely used. In particular, pressure-sensitive adhesive tape using an adhesive mainly composed of butyl rubber,
Since it has excellent weather resistance, alkali resistance and adhesion to rough surfaces, it is particularly suitable for bonding to concrete. Water resistance is evaluated as an important quality as a pressure-sensitive adhesive for joining building materials outdoors or the like, but there is a problem that a pressure-sensitive adhesive containing butyl rubber as a main component is inferior in water resistance.

Japanese Patent Publication No. Sho 62-30233 discloses a pressure-sensitive adhesive in which the adhesive strength is not reduced even under high humidity and high temperature and high humidity by blending vinyl silane, epoxy silane and methacryl silane with an acrylic composition. Have been described. However, according to this, it has been found that it is necessary to further improve the water resistance of a rough surface such as concrete.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and is intended to bond building materials to rough surfaces such as concrete, calcium silicate plate, gypsum board, and wood. An object of the present invention is to provide an excellent rubber-based pressure-sensitive adhesive.

[0007]

According to the present invention, there is provided a rubber-based pressure-sensitive adhesive according to the present invention, comprising: 100 parts by weight of a rubber component comprising at least one of polyisobutylene, butyl rubber and halogenated butyl rubber, and a mercaptosilane compound. And / or 0.5 to 30 parts by weight of an alkylalkoxysilane compound having an alkyl group having 4 or more carbon atoms.

In the present invention, any one of polyisobutylene, butyl rubber and halogenated butyl rubber is used alone or in combination. In addition, natural rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, butadiene rubber, isoprene rubber, and the like may be added as auxiliary components.

[0009] A softener may be added to impart wettability to the adherend and adjust the flexibility. As the softening agent, liquid polyisobutylene, polybutene, liquid ethylene propylene rubber, paraffinic or aromatic process oil, or polyester plasticizer is used. The softener is added in an amount of 10 to 300 with respect to 100 parts by weight of the rubber component.
A range of parts by weight is preferred. If the amount is less than 10 parts by weight, appropriate wettability and flexibility of the adhesive cannot be obtained, and the adhesiveness is reduced.
On the other hand, if it exceeds 300 parts by weight, the cohesive strength of the adhesive decreases, and the adhesive strength decreases.

A tackifier resin may be added to adjust the adhesive strength. As the tackifying resin, rosin ester resin, terpene resin, terpene phenol resin,
Petroleum resin, styrene resin, cumarone / indene resin,
Xylene resins, phenolic resins and the like can be mentioned. The addition amount of the tackifier resin is preferably 200 parts by weight or less based on 100 parts by weight of the rubber component.

The rubber component may be subjected to a crosslinking treatment in order to improve cohesion. As a crosslinking method, a method using a crosslinking agent such as peroxide, quinone dioxime and peroxide, zinc oxide and various crosslinking accelerators, a resin crosslinking method using a phenol resin, or a method using electron beam irradiation is adopted. . The method using electron beam irradiation is particularly effective when halogenated butyl rubber is contained as butyl rubber.

Examples of the mercaptosilane compound used in claim 1 include γ-mercaptopropylmethyldimethoxysilane, γ-mercaptopropyltrimethoxysilane and the like. Examples of the alkylalkoxysilane compound having an alkyl group having 4 or more carbon atoms include n-
Butyltrimethoxysilane, isobutyltrimethoxysilane, n-octyltriethoxysilane, decyltrimethoxysilane, n-hexyltrimethoxysilane, n-
Octadecyltrimethoxysilane, n-dodecyltriethoxysilane, n-hexadecyltrimethoxysilane,
Examples include n-stearyltrimethoxysilane and n-stearyltriethoxysilane.

The addition of an alkylalkoxysilane compound can impart water repellency to the concrete surface. However, in order to improve water resistance, the concrete must have an alkyl group having 4 or more carbon atoms. One or both of the mercaptosilane compound and the alkylalkoxysilane having an alkyl group having 4 or more carbon atoms are contained in the rubber component in an amount of 0.5 to 30 parts by weight. Preferably it is 1 to 20 parts by weight. If the amount is less than 0.5 part by weight, the effect of the addition does not appear and water resistance cannot be obtained. Also, 3
If it exceeds 0 parts by weight, it bleeds on the surface of the adhesive and the initial adhesive strength decreases.

The rubber-based pressure-sensitive adhesive according to the second aspect of the present invention comprises a rubber component comprising at least one of polyisobutylene, butyl rubber and halogenated butyl rubber.
0 parts by weight, 0.1 to 15 parts by weight of any of an epoxysilane compound, an aminosilane compound and a vinylsilane compound, and 0.1 to 15 parts by weight of an alkylalkoxysilane compound having an alkyl group having 4 or more carbon atoms. It is a feature. The same rubber component and alkylalkoxysilane as described above are used.

The epoxysilane compound according to the second aspect includes γ-glycidoxypropylmethyldimethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane and the like. Examples of the aminosilane compound include N- (β-aminoethyl) γ-aminopropylmethyldimethoxysilane, N- (β-aminoethyl) γ-aminopropyltrimethoxysilane, and N- (β
-Aminoethyl) γ-aminopropyltriethoxysilane, γ-aminopropyltrimethoxysilane, γ-aminopropyltriethoxysilane and the like. Examples of the vinylsilane compound include vinyltrimethoxysilane, vinyltriethoxysilane, divinyldichlorosilane, vinyldimethylchlorosilane, vinyltris- (β-methoxyethoxy) silane, p-allylphenylethyldichlorosilane, p-vinylphenyltrichlorosilane, and alkylmethyl. Examples include dichlorosilane and vinyldiphenylchlorosilane.

If the amount of the above-mentioned epoxysilane compound, aminosilane compound or vinylsilane compound is too small, the effect of the addition cannot be obtained and the water resistance is lowered, and if the amount is too large, the adhesive surface bleeds and the initial adhesive strength is lowered. Therefore, the amount is 0.1 to 15 parts by weight, preferably 0.5 to 12 parts by weight based on 100 parts by weight of the rubber component.

On the other hand, if the amount of the alkylalkoxysilane is too small, the effect of the addition cannot be obtained and the water resistance is reduced. If the amount is too large, the adhesive surface bleeds and the initial adhesive strength is reduced. It is 0.1 to 15 parts by weight, preferably 0.5 to 12 parts by weight, based on 100 parts by weight of the component.

In order to use the rubber-based pressure-sensitive adhesive according to claim 1 or 2 as an adhesive tape, a polyethylene foam, a polyurethane foam, an acrylic resin foam,
Using a foam base material such as neoprene rubber foam or butadiene rubber foam, a fiber base material such as nonwoven fabric, woven fabric, or Japanese paper, or a film base material such as polyester, polypropylene, or acrylic resin, the rubber is coated on both surfaces or one surface. Laminate pressure-sensitive adhesive. Also, without using a base material, the pressure-sensitive adhesive layer is formed on the release-treated surface of release paper, and the non-support type double-sided adhesive tape that peels off the release paper after being attached to an adherend may be used. it can.

A method for forming a rubber-based pressure-sensitive adhesive layer on a substrate or release paper is, for example, by dissolving the rubber-based component in a solvent having good compatibility such as toluene, and adding a silane compound and other additives to the solution. Is added and stirred, and the obtained adhesive solution is directly applied to the non-peeled treated surface of the base material on which one surface has been peeled and dried to obtain a desired thickness to obtain a roll. Alternatively, a transfer method in which the base material is adhered to an adhesive layer formed by applying and drying the adhesive solution on a release-treated surface of release paper can also be adopted. In order to form a double-sided pressure-sensitive adhesive tape, an adhesive layer may be similarly formed on the opposite surface of the substrate by a transfer method.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the rubber-based pressure-sensitive adhesive of the present invention will be described below. The following examples were performed as a double-sided tape in which the rubber-based pressure-sensitive adhesive of the present invention was laminated on both sides of an acrylic resin substrate or a foam substrate. Preparation of Acrylic Resin Base Material 90 parts by weight of n-butyl acrylate, 10 parts by weight of acrylic acid, and 3 parts by weight of hydrophilic silica were stirred and mixed, and n-butyl acrylate was added thereto.
Dodecanethiol, hexanediol diacrylate,
A mixture obtained by adding and mixing 2,2-dimethoxy-2-phenylacetophenone is coated on a release-treated surface of a release-treated polyethylene terephthalate film having a thickness of 38 μm, and the same release film comes into contact with the coated surface. As described above, an acrylic resin substrate having a thickness of 1.0 mm was prepared by irradiating with an irradiation intensity of ² mW / cm ² for 8 minutes using a chemical lamp.

(Examples 1, 4, 5) 100 parts by weight of butyl rubber, 65 parts by weight of polybutene, 100 parts by weight of petroleum resin,
2 parts by weight of p-benzoquinonedioxime, 5 parts by weight of zinc white, and the mercaptosilane compound, alkylalkoxysilane compound and epoxysilane compound in the amounts shown in Table 1 were dissolved in 700 parts by weight of toluene. This solution was applied to a release paper surface using an applicator so that the thickness after drying was 100 μm, and the coating was left at 90 ° C. for 2 days to obtain an adhesive layer. This adhesive layer was transferred to both surfaces of the acrylic resin substrate to prepare a double-sided pressure-sensitive adhesive tape.

(Examples 2 and 6) Chlorinated butyl rubber 100
Parts by weight, 65 parts by weight of polybutene, 100 parts by weight of petroleum resin, 5 parts by weight of zinc white, and the mercaptosilane compound, alkylalkoxysilane compound and aminosilane compound in the amounts shown in Table 1 were dissolved in 700 parts by weight of toluene.
This solution is dried with an applicator to a thickness of 1 after drying.
The coating was applied to the release paper so as to have a thickness of 00 μm, and irradiated with 6 Mrad of electron beam to obtain an adhesive layer. This adhesive layer was transferred to both surfaces of an acrylic resin substrate in the same manner as in Example 1 to produce a double-sided pressure-sensitive adhesive tape.

(Examples 3 and 7) 100 parts by weight of butyl rubber, 65 parts by weight of polybutene, 100 parts by weight of petroleum resin, 5 parts by weight of zinc dibutyldithiocarbamate, and mercaptosilane compounds and alkylalkoxysilane compounds shown in Table 1 And vinyl silane compound in toluene 700
It dissolved in parts by weight. This solution was applied to a release paper surface using an applicator so that the thickness after drying was 100 μm, and the coating was left at 90 ° C. for 2 days to obtain an adhesive layer. An adhesive layer was transferred to both sides of a polyethylene foam (thickness: 1 mm) as a substrate to produce a double-sided pressure-sensitive adhesive tape.

Comparative Examples 1 and 2 Double-sided pressure-sensitive adhesive tapes were prepared in the same manner as in Example 1 except that the amount of γ-mercaptopropyltrimethoxysilane was as shown in Table 1.

Comparative Examples 3, 5, and 6 Double-sided pressure-sensitive adhesive tapes were prepared in the same manner as in Example 1 except that the amounts of the alkylalkoxysilane compound and the epoxysilane compound were as shown in Table 1.

Comparative Example 4 A double-sided pressure-sensitive adhesive tape was produced in the same manner as in Example 2 except that the amount of the aminosilane compound was changed as shown in Table 1.

[0027]

[Table 1]

Performance Evaluation (1) Initial Peeling Force The double-sided pressure-sensitive adhesive tape was cut into a width of 20 mm and a length of 150 mm, and the adhesive layer on one side was 200 m in a 23 ° C. atmosphere.
m, Adhesion length 100m to concrete board of thickness 10mm
m, a SUS sheet having a thickness of 50 μm as a backing material was adhered to the surface of the other adhesive layer, and pressed and reciprocated twice with a roller weighing 2 kg, and allowed to stand at 23 ° C. for 72 hours. At a speed of 300 mm / min.
The peel force was measured.

(2) Initial shear adhesive strength A double-sided adhesive tape was attached to a concrete plate in the same manner as used for the initial peel force measurement, and SUS was applied to the other adhesive layer surface.
After a concrete plate having a thickness of 10 mm is bonded in place of the sheet and pressed from above with a load of 5 kg for 15 minutes, one of the concrete plates is pulled in a shearing direction at a speed of 50 mm / min, and the initial time when the concrete plate is displaced. The shear adhesion was measured.

(3) Measurement of Water-Resistant Adhesion Force The same test specimen used for the measurement of the initial peel force and the initial shear adhesion force was left at 23 ° C. for 72 hours, and then immersed in warm water at 40 ° C. for 30 days. Remove the body and immediately (1) and (2)
The 90-degree peel force and the shear adhesive force were measured in the same manner as in the above. Table 1 shows the above results.

[0031]

[Table 2]

As can be seen from Table 1, in the initial adhesive strength, the one in the example has a stable strength, while the one in the comparative example has a large difference between the maximum value and the minimum value of the peeling force and the adhesive force. It is unstable. It is also clear that the waterproof adhesive strength of the embodiment is superior to that of the comparative example.

As described above, the rubber-based pressure-sensitive adhesive of the present invention has excellent initial adhesive strength and water resistance, and can be applied to rough-surface adherends and adherends to which dust adheres. It shows excellent adhesion. Therefore, it can be suitably used for bonding building materials to concrete, wood, and the like.

Claims (2)

[Claims] 1. A rubber component comprising at least one kind of polyisobutylene, butyl rubber and halogenated butyl rubber, 100 parts by weight, a mercaptosilane compound and / or
Or a rubber-based pressure-sensitive adhesive comprising 0.5 to 30 parts by weight of an alkylalkoxysilane compound having an alkyl group having 4 or more carbon atoms. 2. A rubber component comprising at least one kind of polyisobutylene, butyl rubber and halogenated butyl rubber, and 100 parts by weight of any one of an epoxysilane compound, an aminosilane compound and a vinylsilane compound.
A rubber-based pressure-sensitive adhesive comprising 0.1 to 15 parts by weight and 0.1 to 15 parts by weight of an alkylalkoxysilane compound having an alkyl group having 4 or more carbon atoms.