JPS6339978A - Tacky adhesive tape or sheet composed of plastic nonwoven fabric - Google Patents

Abstract

PURPOSE:To provide the title tape which has excellent mechanical properties over a wide temp. range, is suitable for use in fixing tiles and has excellent waterproofness, viscoelastic properties, handleability and applicability, by coating and impregnating at least one side of a plastic nonwoven fabric with a specified tacky rubber compsn. CONSTITUTION:At least one side of a plastic nonwoven fabric (e.g., needle- punched spun-bonded fabric) is coated and impregnated with a tacky rubber compsn. having a Mooney viscosity [ML1+4 (50 deg.C)] of 12-65, obtd. by kneading butyl rubber and reclaimed butyl rubber with a petroleum resin, polybutene, clay and an antioxidant, etc. by means of a calender heated at 70-140 deg.C. If desired, a release paper is laminated thereon to obtain the title tape having a unit weight of 500-1,200 g/m<2>, a longitudinal tensile strength of 5-10 kgf/cm, a transverse tensile strength of 3-7 kgf/cm, a longitudinal bending resistance of 13-31 gf.cm and a tack of not lower than 5 at 10 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plastic nonwoven adhesive tape or sheet used in tiling methods and the like.

[Conventional technology]

Traditionally, the mainstream method for attaching tiles, which are one of the surface finishing materials for buildings, to the base material was to use mortar, which was mainly made of cement-based materials.
Particularly for interior walls, with the diversification of base materials to plywood, 5-asbestos cement boards, calcium silicate boards, gypsum boards, boards such as sheathing boards, ALC boards, and precast concrete, adhesives using organic adhesives are becoming increasingly popular. The construction method is becoming popular.

This adhesive method uses a dry-curing adhesive such as synthetic rubber latex or acrylic emulsion, or a reaction-curing adhesive such as epoxy-modified synthetic rubber latex or epoxy resin on a precisely finished base material. This method involves applying it, rolling it with a comb trowel, and then crimping and fixing the tiles or unit tiles.

[Problem that the invention seeks to solve]

By the way, in the tiling method, the base materials are diversified as mentioned above, and the linear expansion coefficients of these base materials are:
The ALC board, which is said to be relatively small, is 0.6
10-' ~ 0.7 x 10-'/'C,
The coefficient of linear expansion of the tile is 0.3 x 1, while the coefficient of linear expansion of the tile is 1.15 x 10-'/'C for steel plate and 20 x 10-'/'F for fiber-reinforced plastic.
Since there are
C board, concrete 2x to-'~15'X 1
In contrast, the tile □ is fired at a high temperature, so the subsequent shrinkage rate is extremely small.
As described above, the base material expands and contracts more than tiles due to changes in external conditions, and when tiles are adhered to the base material, stress is generated between the tile and the base material. On the other hand, in order to obtain the desired tile fixation properties, the adhesive used in the adhesive laying method is a hardening type.
It has poor elasticity and the applied adhesive layer has insufficient waterproof properties. Therefore, the stress generated between the tile and the base material is not relieved and accumulates over time, causing cracks not only in the joints but also in the tile, reducing waterproofness and significantly accelerating the aging of the base material. Cause.

For this reason, it is conceivable to affix the tiles to the base material through a waterproof sheet made by coating and impregnating a plastic nonwoven fabric with an asphalt-based adhesive composition.

However, since the asphalt-based adhesive composition has high temperature sensitivity, it is difficult to stick it to the adhesive layer applied to the base material at low temperatures.

It is easy to cause cracks, and at high temperatures, workability is reduced due to a significant decrease in viscosity and migration, and contamination of materials other than the base material is severe.

Since the asphalt-based adhesive composition has a large creep property, it cannot be expected to provide sufficient tile fixing properties in high-temperature places such as bathrooms.

This invention was made to solve the above-mentioned problems, and its purpose is to provide a plastic nonwoven adhesive tape or sheet that is highly waterproof, has sufficient fixation properties, and has good workability. .

[Means for solving the problem] In order to achieve this object, in the present invention, at least one side of the plastic nonwoven fabric has a Mooney viscosity of 12
-65 is coated and impregnated, the weight per unit area is 500 to 1200 g/rrr, the vertical tensile strength is 5 to 1 Okgf/m, and the horizontal tensile strength is 3 to 7 kgf. /as, vertical bending resistance is 13 to 31
A plastic nonwoven adhesive tape or sheet that is gf-3 and has a tack of 5 or more at 10°C. Here, the Mooney viscosity is based on the Mooney viscosity test specified in JIS 6300 (ML1+4 (50°C))
It is obtained by measuring according to the tack (ball rolling method) specified in JIs Z 0237, and the bending resistance is JI! It is obtained by measuring bending resistance (slide method) specified in li L 1096 at L=125-.

[Effect]

Since this plastic non-woven adhesive tape or sheet uses a rubber-based adhesive composition as the adhesive composition, its viscoelasticity prevents cracks and waterproof defects in the tiles and adhesive composition. can. Also,
The rubber adhesive composition has low temperature dependence, and the plastic nonwoven fabric has low directionality and high modulus at low elongation, so it is possible to improve the fixation of tiles over a wide temperature range. Furthermore, the plastic nonwoven fabric has appropriate flexibility and the tack of the rubber adhesive composition has little temperature dependence, so it is easy to handle and work.

The Mooney viscosity of the rubber adhesive composition is 12 to 6.
5, and the tack at 10°C is 5 or more,
It maintains good viscoelastic properties within the range of temperature changes at the location where the tiles are installed, and has sufficient surface properties to maintain sufficient workability. That is, since the Mooney viscosity is 12 or more, sufficient tile fixing properties can be expected because the creep property is small, and since the Mooney viscosity is 65 or less, the impregnating property of the adhesive composition into the plastic nonwoven fabric is improved. There will be no shortage, and
Since the flexibility does not significantly decrease and the tack at 10° C. is 5 or more, one surface adhesion is sufficient and the adhesion is excellent. In addition, the vertical tensile strength is 5 kgf/am or more, and the horizontal tensile strength is 3 kgf/am.
Because of the above, it has mechanical properties that can withstand the load of the tiles to be fixed, and has a vertical tensile strength of 10 kgf/m or less.
Since the horizontal tensile strength is 7 kgf/am or less and the vertical bending strength is 13 to 31 gf-cs, it has appropriate flexibility and good workability. Furthermore, since the weight per unit area is 500 g/rrf or more, the rubber-based adhesive composition is not completely impregnated into the plastic nonwoven fabric, and since the weight per unit area is 1200 g/rrf or less, a moderate amount of Has flexibility.

〔Example〕

Example 1 a = 1 e The raw materials having the compositions A-H in Table 1 (unit: parts by weight) were kneaded for about 40 minutes in a Nee-Goo to obtain adhesive compositions A-E, and this adhesive composition A- E was supplied to a calender heated to 70 to 140°C, and the basis weight of the nonwoven fabric was 60 g/rrr.
, the average fiber length is 60 m, the amount of adhesive added is 45% by weight, the fiber material is 40% polyester, 60% rayon, the thickness is about 0.4 m, and the adhesive composition A-E is impregnated with the coating thickness. After applying it so that the thickness is 0.3 mm,
A release paper was attached to make a plastic nonwoven adhesive tape.

Table 1 Examples 2a to 2d Nonwoven fabric basis weights are 50.70.90 and 110 g, respectively.
/ Needle-punched spunbond fabric made of continuous filament yarn with 35% adhesive content and 100% polyester fiber material, with a thickness of approximately 0%.
．． 3 mm of the above adhesive composition C was coated in the same manner as in Examples 1a to 1e to give plastic nonwoven adhesive tapes.

Example 3 Adhesive composition C having a thickness of about 0.2 wm was applied to the surface of the plastic nonwoven adhesive tape of Example 2b on which adhesive composition C was not applied, in the same manner as in Examples 1a to 1e, and the plastic nonwoven adhesive tape was It was made into a tape.

Table 2 shows the Mooney viscosity, etc. of the plastic nonwoven adhesive tapes and commercially available sheets (asphalt-based nonwoven adhesive sheets) of Examples 1a to 1e. Here, the holding force test method is based on JIS Z 1524.

Margin below As is clear from this table, when the Mooney viscosity exceeds 65, the adhesion and impregnating properties for nonwoven fabrics are poor, while when the Mooney viscosity is less than 12, the holding power is insufficient, especially at high temperatures. Poor tile fixation.

Table 3 shows the holding power, etc. of the plastic nonwoven adhesive tapes of Examples 2a to 2d and 3.

As is clear from this table, even if the basis weight of the nonwoven fabric changes, the effect on the adhesiveness etc. is very small.

Table 4 shows the tensile strength, etc. of the plastic nonwoven adhesive tapes and commercially available sheets of Examples 1c, 2a to 2d, and 3. Here, the tensile strength test method is JIS Z 02
37 Based on tensile strength.

As is clear from this table, the vertical tensile strength is 5kgf
If the horizontal tensile strength is less than 3 kgf/am, the workability will be poor because distortion will occur easily.

On the other hand, when the bending resistance exceeds 31 gf-cs, workability also decreases.

Table 5 shows the heating dimensional change rates of the plastic nonwoven adhesive tapes and commercially available sheets of Examples 1b, 1c, 2a to 2d, and 3. Here, the heating dimensional change rate is JIS K
According to the heating dimensional change test specified in 6767, 70℃
This is the rate of change immediately after heating for 24 hours.

Margin table below 5 As is clear from this table, examples 1b, lc, 2a to 2d
The plastic non-woven adhesive tapes of Examples 2a to 2d and 3 show a heating dimensional change rate equal to or lower than that of commercially available sheets, and in particular, the plastic non-woven adhesive tapes of Examples 2a to 2d and 3 using needle-punched spunbond cloth have a heating dimensional change rate of The rate of change is extremely small.

Table 6 shows the adhesive strength of the plastic nonwoven adhesive tapes of Examples 2c and 3 and the commercially available sheets to tiles.

Here, the semi-porcelain tile is a JIS A3209 interior ceramic tile cut into 40 squares x 40 squares, and the colored contact mosaic tile is a JIS A3209 mosaic tile cut into 47 cm x 47 squares. Also,
The measurement method was to use epoxy adhesive Tilement T C-100 as the adhesive, and set the crosshead speed to 1/w.
Based on a uniaxial tensile adhesive strength test with an in. Furthermore, normal curing refers to the case where the temperature is 20±1℃ and humidity is 60±5% for 7 days, and water curing refers to the case where the temperature after normal curing is 20±1℃.
This shows the case where the tiles were immersed in water at 2°C for 7 days, and the hot water curing shows the case where they were immersed in warm water with a temperature of 60 ± 2°C for 7 days after normal curing. When curing in hot water was performed, the tiles peeled off during curing, and the adhesive surface turned blackish brown.

As is clear from this table, the plastic nonwoven fabric adhesive tapes of Examples 2c and 3 have greater adhesive strength than commercially available sheets under any curing conditions, and are superior in tile fixing properties.

Further, as shown in FIG. 1, Example 2c was applied to a base material 1 made of a slate board of 300 mm square with a thickness of 6 mm and an epoxy Tilement EP-333 adhesive 2.

Adhere the plastic non-woven adhesive tape 3 in step 3.

Furthermore, epoxy Tilement EP-333 adhesive 4
A 100w square semi-porcelain wall tile 5 was adhered using the method, and a joint material 6 made of Portland cement type tile fixing material CG-411 was provided at a temperature of 20±1°C.

After curing for 7 days at humidity 60±5%R)I, temperature -1
Even if the cycle of 8 hours in an atmosphere of 0°C, 16 hours in hot water of 80°C, and 8 hours in an atmosphere of -10°C was repeated 10 times, the tiles and grout remained intact. No abnormality occurred. On the other hand, when the tiles 5 were bonded directly to the base material 1 using adhesive 4 and a joint material made of white cement was applied, and the same test as above was conducted, fine cracks and racks were generated at the joints. .

As is clear from this, when the plastic nonwoven adhesive tapes of Examples 2c and 3 are used, cracks in the tiles,
The tiles do not fall off, and exhibit excellent effects on tile fixation and stress relaxation between the base material 1 and the tile 5.

As described above, the plastic nonwoven fabric adhesive tapes of Examples 1b, ld, 2a to 2d, and 3 all have greater holding power and lower temperature sensitivity than commercially available sheets.

In the method of fixing tiles using adhesive tape.

In particular, it exhibits an excellent effect on tile retention under high temperatures, and the tack at 23°C is smaller than that of commercially available sheets, so there is less sticky feeling on the surface, making it easier to handle the tape, and even at 5°C. It has tack, good adhesion maintains its properties, and the heating dimensional change rate is equal to or lower than that of commercially available sheets, especially in Example 2.
The plastic nonwoven fabric adhesive tapes a to 2d and 3 have extremely small dimensional change rates upon heating, and have excellent tile fixing properties even in locations subject to severe thermal fluctuations.

In particular, by using needle-punched spunbond fabric, the tensile product becomes large and
The modulus at low elongation is higher, which not only improves workability during manufacturing, but also reduces distortion during construction, making it easier to install, as well as reinforcing waterproofing and reducing the amount of stress that can occur between the base material and the tile. Even in the relaxation of stress, the balanced effect of low directionality, combined with the low temperature sensitivity of the adhesive composition, is further demonstrated.

In the above embodiments, the case of a plastic non-woven adhesive tape was explained, but the present invention can also be applied to a plastic non-woven adhesive sheet. In the above embodiments, the fiber material of the plastic nonwoven fabric was 40% polyester, 60% rayon, or 100% polyester, but it may also be made of nylon, polyethylene, polypropylene, vinylon, cotton, acetate, acrylic, etc. In the above examples, butyl rubber was used as the elastomer of the rubber adhesive, but natural rubber or isoprene rubber may also be used.

Rubbers with low polarity such as halogenated butyl rubber, styrene-butadiene rubber, butadiene rubber, and ethylene-propylene rubber may be used.In addition, in the above embodiments, the processability and viscoelastic properties of the rubber-based adhesive are improved. Although recycled butyl rubber was used for this purpose, styrene-butadiene-styrene was used.

Block copolymers such as styrene-isoprene-styrene, polyisobutylene, chloroprene, nitrile rubber, etc. may also be used.Furthermore, in the above examples, petroleum resin was used as the tackifier for the rubber-based adhesive. However, rosin, rosin derivatives, polyterpene resins, terpene-phenol resins, coumaron-indene resins, etc. may also be used.Also, in the above examples, polybutene was used as a softener for the rubber adhesive. , various plasticizers, liquid tackifiers, polyisobutylene low polymers, process oils, vulcanizing oils, etc. may be used, and by appropriately adding a softener, viscosity, wetting characteristics, and low temperature properties can be improved. Furthermore, in the above examples, clay was used as a filler for the rubber adhesive, but zinc white,
Silica, aluminum hydroxide, calcium carbonate, kaolin.

Talc, etc. may also be used, and these should be selected appropriately.

When used in combination, physical properties, properties, economic efficiency, etc. can be improved. Furthermore, temperature sensitivity can be improved by adding a rubber vulcanization accelerator to the rubber-based adhesive.

〔Effect of the invention〕

As explained above, in the plastic nonwoven adhesive tape or sheet according to the present invention, it is possible to prevent the occurrence of cracks and waterproof defects in the adhesive composition.
It is highly waterproof, does not lack the ability of the adhesive composition to impregnate the plastic nonwoven fabric, has mechanical properties that can withstand the load of the tile to be fixed, and is within the range of temperature changes at the location where the tile is installed. The tiles maintain good viscoelastic properties over a wide temperature range, and are easy to handle and have sufficient surface properties to maintain sufficient workability. Since the adhesive composition is not completely impregnated into the plastic nonwoven fabric, the adhesive composition has excellent adhesion properties, and has appropriate flexibility, resulting in good workability. As described above, the effects of this invention are remarkable.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a state in which tiles are pasted using the plastic nonwoven adhesive tape according to the present invention. 1... Base material

Claims (1)

[Claims] 1. A rubber adhesive composition having a Mooney viscosity of 12 to 65 (ML_1_+_4 (50°C)) is coated and impregnated on at least one side of a plastic nonwoven fabric, and the weight per unit area is 500 to 1200 g. /m^2, the vertical tensile strength is 5 to 10 kgf/cm, and the horizontal tensile strength is 3 to 7.
kgf/cm, and the vertical bending resistance is 13 to 31 gf.
1. A plastic nonwoven adhesive tape or sheet having a tack of 5 cm or more at 10°C. 2. The plastic nonwoven fabric adhesive tape or sheet according to claim 1, wherein a needle-punched spunbond fabric is used as the plastic nonwoven fabric.