JPH0217592B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] 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 has been to use attachment mortar, which is mainly made of cement-based materials. For interior walls, the base material is boards such as plywood, asbestos cement board, calcium silicate board, gypsum board, sheathing board, etc.
With the diversification of materials such as ALC boards and precast concrete, adhesive-stretching methods that use organic adhesives are becoming more popular. This adhesive bonding method applies 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 to a precisely finished base material. This is a construction method in which the tiles or unit tiles are crimped and fixed using a comb-like trowel. [Problems to be solved by the invention] By the way, in the tiling method, the base materials are diversified as mentioned above, and the coefficient of linear expansion of these base materials is 0.6 even for ALC board, which is said to be relatively small. ×10 ^-5 to 0.7 × 10 ^-5 /℃, 1.15 × 10 -5 /℃ for steel plates, and 1.15 × 10 ^-5 /℃ for fiber reinforced plastics.
The linear expansion coefficient of tiles ranges from 10×10 ^-6 to 20×10 ^-6 /°F, while the linear expansion coefficient of tiles is 0.3×10 ^-5 to 0.6×10 ^-5 /°C, so the linear expansion coefficient of the base material is larger than the coefficient of linear expansion of the tile. In addition, the base material shrinks significantly as it hardens and dries, and ALC boards and concrete
It has a shrinkage rate ranging from ×10 ⁻⁴ to 15×10 ⁻⁴ , whereas tiles are fired at high temperatures, 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-stretching method is of a hardening type, so it has poor elasticity and the applied adhesive layer is not waterproof. It is enough. Therefore, the stress generated between the tile and the base material is not alleviated,
It accumulates over time, causing cracks not only in the joints but also in the tiles, reducing waterproofness and significantly accelerating the aging of the base material. For this reason, it is conceivable to attach 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, asphalt-based adhesive compositions have high temperature sensitivity, so it is difficult to attach them 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 properties, and contamination of materials other than the base material is severe. Furthermore, 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 has high waterproofness, sufficient fixing properties, and good workability. . [Means for Solving the Problems] In order to achieve this object, the present invention uses an adhesive-pasting method in which a base material and a tile are pasted together with an adhesive. In the plastic nonwoven fabric adhesive tape or sheet provided ⁱⁿ Yes, vertical tensile strength is 5-10Kgf/cm, horizontal tensile strength is 3-7Kg
f/cm, a vertical bending strength of 13 to 31 gf·cm, and a tack at 10°C of 5 or more.
Here, Mooney viscosity is measured according to the Mooney viscosity test (ML ₁₊₄ (50℃)) specified in JIS K 6300, and tack is measured according to the tack (ball rolling method) specified in JIS Z 0237. Furthermore, the bending resistance is obtained by measuring the bending resistance (slide method) specified in JIS L 1096 at L=125 mm. [Function] This plastic non-woven adhesive tape or sheet uses a rubber-based adhesive composition as the adhesive composition, so its viscoelasticity prevents the occurrence of cracks and waterproofing defects in the tiles and adhesive composition. can do. Further, since the rubber adhesive composition has low temperature dependence, and the plastic nonwoven fabric has low directionality and high modulus at low elongation, 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. Since the asphalt-based adhesive composition has a Mooney viscosity of 12 to 65 and a tack of 5 or more at 10°C, it maintains good viscoelastic properties within the range of temperature changes at the location where tiles are installed. , and has sufficient surface properties to maintain sufficient workability. In other words, 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 plastic nonwoven fabrics is low. There is no shortage, there is no significant decrease in flexibility, and the tack at 10°C is 5 or more, so the surface tack is sufficient and the adhesion is excellent. In addition, the vertical tensile strength is 5 Kgf/cm or more, and the horizontal tensile strength is 3 Kgf/cm or more, so it has mechanical properties that can withstand the load of the tiles to be fixed, and the vertical tensile strength is 10 Kgf/cm. cm
Below, the horizontal tensile strength is 7Kgf/cm or less,
In addition, since the vertical bending resistance is 13 to 31 gf.cm, it has appropriate flexibility and has good workability. Furthermore, since the weight per unit area is 500 g/m ² 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/m ² or less, it is flexibility. [Example] Examples 1a to 1e The raw materials having the compositions A to E in Table 1 (unit: parts by weight) are thoroughly kneaded for about 40 minutes using a kneader to obtain adhesive compositions A to E. ~E70~
The nonwoven fabric was fed to a calender heated to 140℃, and the basis weight of the nonwoven fabric was 60g/m ² , the average fiber length was 60mm, the amount of adhesive added was 45% by weight, the fiber material was 40% polyester, 60% rayon, and the thickness was approx. A 0.4 mm nonwoven fabric was impregnated with adhesive compositions A to E and coated to a coating thickness of 0.3 mm, and then a release paper was attached to obtain a plastic nonwoven fabric adhesive tape.

【table】

[Table] Examples 2a to 2d Nonwoven fabric basis weights are 50, 70, 90, and 110g/m ² , respectively.
Example 1a~ The above adhesive composition C with a thickness of 0.3 mm was applied to a needle-punched spunbond fabric using a continuous filament yarn with an adhesive loading of 35% by weight and a fiber material of 100% polyester. It was applied in the same manner as 1e to make a plastic nonwoven adhesive tape. Example 3 The surface of the plastic non-woven adhesive tape of Example 2b on which adhesive composition C is not applied is coated with a thickness of approx.
0.2 mm of adhesive composition C was applied as in Examples 1a to 1e to give plastic nonwoven adhesive tapes. Table 2 shows the Mooney viscosity of the plastic nonwoven adhesive tapes and commercially available sheets (asphalt adhesive sheets) of Examples 1a to 1e. Here, the holding force test method is based on JIS Z 1524.

[Table] As is clear from this table, Mooney viscosity is 65
If the Mooney viscosity exceeds 12, the adhesion and impregnating properties of the nonwoven fabric will be poor, while if the Mooney viscosity is less than 12, the holding power will be insufficient, and the tile fixing property will be poor, especially at high temperatures. Table 3 shows the holding power, etc. of the plastic nonwoven fabric adhesive tapes of Examples 2a to 2d and 3.

[Table] As is clear from this table, even if the basis weight of the nonwoven fabric changes, the effect on adhesive properties 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
According to JIS Z 0237 tensile strength.

[Table] As is clear from this table, when the vertical tensile strength is less than 5 Kgf/cm and the horizontal tensile strength is less than 3 Kgf/cm, distortion tends to occur, resulting in poor workability. On the other hand, workability also decreases when the bending resistance exceeds 31 kgf.cm. 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 the change rate immediately after heating at 70°C for 24 hours in accordance with the heating dimensional change test specified in JIS K 6767.

【table】

[Table] As is clear from this table, Examples 1b, 1c, 2a~
The plastic non-woven adhesive tapes of Examples 2d and 3 showed a heating dimensional change rate equal to or lower than that of commercially available sheets. In particular, the plastic non-woven adhesive tapes of Examples 2a to 2d and 3 using spunbond cloth subjected to needle punching were heated. Dimensional change rate is extremely small. Table 6 shows the adhesive strength of the plastic non-woven adhesive tapes of Examples 2c and 3 and commercially available sheets to tiles. Here, semi-porcelain tiles are JIS A
5209 interior ceramic tiles are cut into 40mm x 40mm, and the colored contact mosaic tiles are JIS A.
5209 mosaic tile cut into 47mm x 47mm. The measurement method was a uniaxial tensile adhesive strength test using the epoxy adhesive Tilement TC-100 as the adhesive and at a crosshead speed of 1 mm/min. Furthermore, normal curing is at a temperature of 20±1
℃ and humidity of 60±5% for 7 days. Water curing indicates immersion in water at a temperature of 20±2℃ after normal curing for 7 days. Warm water curing indicates a case of immersion in water at a temperature of 60±2℃ after normal curing. The field is shown after being immersed in warm water at ℃ for 7 days. Note that when semi-porcelain tiles were bonded via a commercially available sheet and cured in hot water, the tiles peeled off during curing and the adhesive surface turned blackish brown.

〔Effect of the invention〕

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

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a state in which tiles are pasted using the plastic non-woven adhesive tape according to the present invention. 1... Base material, 3... Plastic non-woven fabric adhesive tape, 5... Tile, 6... Joint material.

Claims (1)

[Scope of Claims] 1. A plastic non-woven fabric adhesive tape or sheet that is used in an adhesive method of attaching a base material and a tile with an adhesive and is provided between the base material and the tile, which comprises at least one of the plastic non-woven fabrics. Mooney viscosity 12-65 on one side
(ML ₁₊₄ (50℃)) is coated and impregnated with a rubber adhesive composition with a weight per unit area of 500 to 1200.
g/ ^m2 , and the vertical tensile strength is 5 to 10 Kgf/
A plastic non-woven fabric adhesive tape characterized by having a horizontal tensile strength of 3 to 7 kgf/cm, a vertical bending strength of 13 to 31 gf/cm, and a tack at 10°C of 5 or more. sheet. 2. The plastic nonwoven fabric adhesive tape or sheet according to claim 1, characterized in that the plastic nonwoven fabric is a needle-punched spunbond fabric.