JPH07138532A - Adhesive composition for carpet - Google Patents

Abstract

PURPOSE:To obtain the title compsn. which has a controllable peeling strength and enables a carpet bonded with the compsn. to be easily peeled off without damaging an underlaid waterproof layer and to be easily bonded again by compounding a specific water-base resin emulsion, an inorg. hydraulic cement, and foamed particles. CONSTITUTION:The title compsn. is prepd. by compounding 100 pts.wt. (based on the solid resin) water-base emulsion of a resin having a glass transition point of 5 deg.C or lower, 150-450 pts.wt. inorg. hydraulic cement (e.g. portland cement), and 20-160 pts.wt. foamed particles which are not necessary spherical and have particle sizes of 5-300mum and an apparent density of 0.7-1.2 g/cm<3> (e.g. shirasu balloon). The emulsion is easily obtd. by the emulsion polymn. of various unsatd. monomers, e. g. an acrylic ester and styrene. The compsn. is used usually in the form of slurry contg. 100-200 pts.wt. water.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive composition used for adhering various carpets including those called artificial grass to concrete bodies and the like.

[0002]

2. Description of the Related Art Carpets called artificial lawns are laid on the roofs of buildings, golf courses, and aisles in parks. To fix such carpets to concrete bodies, epoxy resin or urethane resin adhesives are used. It is used. However, when these fixed artificial lawns are peeled off for replacement, the adhesive remains on the concrete body, or even the base waterproof layer applied to the concrete body or the like is destroyed. In the case of the former, there is a problem that the artificial lawn cannot be adhered even if it is attempted to be adhered again, and in the case of the latter, it is necessary to construct the waterproof layer again on the concrete body, etc.
There was a problem of requiring labor and expense.

A method of nailing can be used to fix the artificial lawn or the like, but when the waterproof layer is applied, there is a problem that a hole is made in the waterproof layer.

[0004]

DISCLOSURE OF THE INVENTION The present invention is capable of firmly adhering to a concrete body or the like, and does not destroy the underlying waterproof layer when the carpet is peeled off, and even if the adhesive remains on the peeled surface, It is an object of the present invention to provide a carpet adhesive composition that can be rebonded thereon.

[0005]

Means for Solving the Problems As a result of various studies to solve the above problems, the inventors of the present invention were able to achieve the object by the following adhesive composition for carpet. is there.

That is, the carpet adhesive composition of the present invention comprises an aqueous emulsion of a resin having a glass transition point of 5 ° C. or lower, and 150 to 450 parts by weight of a hydraulic inorganic cement with respect to 100 parts by weight of the resin solid content of the emulsion. The composition is characterized by containing 20 to 160 parts by weight of foam particles.

The resin aqueous emulsion having a glass transition point of 5 ° C. or lower used in the adhesive composition of the present invention is usually easily obtained by emulsion polymerization of various unsaturated monomers. That is, various unsaturated monomers that give homopolymers having various glass transition points, for example, 2-ethylhexyl acrylate (Tg-85 ° C) [Note;
It is an abbreviation that the glass transition point of a homopolymer of 2-ethylhexyl acrylate is -85 ° C. The same applies below],
N-Butyl acrylate (Tg-54 ° C), ethyl acrylate (Tg-22 ° C), vinylidene chloride (Tg-
18 ° C), isopropyl acrylate (Tg-5 ° C),
2-ethylhexyl methacrylate (Tg-5 ° C), n-propyl acrylate (Tg 8 ° C), n-butyl methacrylate (Tg 20 ° C), vinyl acetate (Tg 30 ° C),
Acrylic acid (Tg 87 ° C), n-propyl methacrylate (Tg 81 ° C), styrene (Tg 100 ° C), acrylonitrile (Tg 100 ° C), methyl methacrylate (Tg 105 ° C), methacrylic acid (Tg 130)
℃), maleic anhydride, itaconic acid (Tg 130
° C), acrylic acid amide (Tg 153 ° C), ethyl methacrylate (Tg 65 ° C), vinyl chloride (Tg 79
C.), and one or more kinds of unsaturated monomers appropriately selected from ethylene, butadiene and the like are obtained by emulsion polymerization.

The aqueous resin emulsion used in the present invention may be a homopolymer or a copolymer.
The Tg value added in parentheses to the unsaturated monomer for preparing the resin aqueous emulsion is, as described above, the glass transition point (Tg) of the homopolymer of the monomer. However, generally, the Tg of the copolymer can be easily estimated from the Tg of the homopolymer of the monomer and the copolymerization ratio of the monomer. Therefore, the aqueous emulsion of a resin having a glass transition point of 5 ° C. or less used in the present invention can be easily produced by designing a polymer based on the estimated approximate value to easily produce an aqueous emulsion of a resin having a desired Tg value. can do.

The resin aqueous emulsion used in the present invention may be a mixture of two or more kinds of resin emulsions, and the water-redispersible resin powder produced from the resin emulsion is redispersed in an aqueous medium. It may be a resin emulsion (commonly known as a powder emulsion) obtained by dispersing.

If the glass transition point of the resin of the resin emulsion used is too high, the adhesive composition film becomes hard and inflexible, resulting in poor walkability and a difference in elongation from the elastic waterproof layer. Based on the above, the waterproof layer may be cut or the adhesive layer may be cracked or peeled off.
Further, there arise problems that the waterproof layer is peeled off when the carpet is peeled off, the waterproof layer is scratched, and it becomes difficult to form the adhesive composition into a film during adhesion in winter. Therefore, Tg is 5 ° C. or less, preferably −40 to
An aqueous emulsion of the resin at 0 ° C is used.

The hydraulic inorganic cement used in the adhesive composition of the present invention includes what is called Portland cement (for example, ordinary cement, white cement, early strength cement, super early strength cement, etc.) and mixed cement. Examples thereof include blast furnace cement (eg, blast furnace cement, silica cement, fly ash cement, etc.), alumina cement, hydraulic gypsum powder, etc., but generally Portland cement, especially ordinary cement, and white cement are preferred.

The hydraulic inorganic cement is 150 to 45 to 100 parts by weight of the resin solid content of the resin aqueous emulsion.
0 parts by weight, preferably 150 to 300 parts by weight are used. If the proportion of cement is too low, the adhesive film will be flexible and the walking feeling will be good, but the adhesive strength, especially when immersed in water, will be reduced. Also, if the proportion of cement is too large, the adhesive film becomes poor in flexibility, and not only the walking feeling becomes poor, but also the adhesive strength becomes too large,
When the carpet is peeled off, the underlying waterproof layer will be damaged.

The foam particles to be contained in the adhesive composition of the present invention have a particle size of preferably 5 to 500 μm, more preferably 50 to 300 μm, and a specific gravity of preferably 0.
It is 7 to 1.2 g / cm ³ , and the shape does not necessarily have to be spherical. Examples of the foam particles, for example, shirasu balloon, foam glass, inorganic foam such as foam silica, polyethylene foam, polypropylene foam,
Although there are organic foams such as polystyrene foams, inorganic foams are preferred because the organic foam particles have poor dispersibility / mixability in the adhesive composition.

The foam particles impart appropriate flexibility to the adhesive film to improve walkability, and at the same time, when the carpet is peeled off, the particles themselves are destroyed by an appropriate peeling force to facilitate peeling in the adhesive layer. As a result, it acts to prevent the underlying waterproof layer from being damaged. The amount of the foam particles used is 20 to 160 parts by weight, preferably 25 to 130 parts by weight, based on 100 parts by weight of the resin solid content of the resin aqueous emulsion. If the proportion of the foam particles is too small, the flexibility of the adhesive film will be good, but it will be easy to scratch the underlying waterproof layer at the time of peeling the carpet, and if the proportion is too large, the adhesive film will be brittle. And the adhesive strength is reduced.

The adhesive composition of the present invention is used as a water-containing slurry containing an appropriate amount of water. The water may be only water based on the resin aqueous emulsion, but usually, additional water is added. Water is added and used.
In general, if the amount of water is too small, the composition has poor fluidity and the workability such as coating becomes poor. Further, if the amount of water is too large, the resin aqueous emulsion and other components are separated from each other, which is not preferable, and the adhesive film after curing and drying may be cracked or shrink. . The amount of water when the adhesive composition is used is usually preferably 100 to 200 parts by weight with respect to 100 parts by weight of the resin solid content.

The adhesive composition of the present invention may contain various additives, if necessary, in addition to the above-mentioned essential components. For example, an inorganic extender pigment such as calcium carbonate, silica sand, talc, clay, or aluminum hydroxide can be contained in an amount of 400 parts by weight or less, preferably 300 parts by weight or less, based on 100 parts by weight of the resin solid content of the resin aqueous emulsion. . If the content ratio of the inorganic extender pigment is too high, the adhesive film becomes poor in flexibility and the walking property becomes poor.

In the adhesive composition of the present invention, pigments and paints for coloring, various fiber powders, antifoaming agents, plasticizers, thickeners, antifungal agents, water reducing agents, flow agents, curing control agents. Agent, wetting agent,
A dispersant, an emulsifier, an antifreezing agent, a flame retardant, etc. can be contained.

Further, the adhesive composition of the present invention can optionally contain an aqueous emulsion of a resin other than the above-mentioned aqueous emulsion of the resin. However, even when containing other resin emulsion, the content of the resin aqueous emulsion is
It is necessary to set the resin solid content to 60% by weight or more based on the total resin solid content.

A typical method of adhering a carpet (artificial grass etc.) onto a concrete body using the adhesive composition of the present invention will be described. An appropriate undercoat waterproof layer is provided on the concrete body, preferably on the surface. On the provided concrete body, the adhesive composition of the present invention is applied so that an adhesive layer having a wet thickness of 1 to 5 mm is formed. For the application, the adhesive composition may be poured and spread with a trowel or roller,
It may be applied by spray painting. Then, the back surface of the carpet is overlaid on the adhesive layer, lightly pressed from above, and left for 3 to 24 hours, preferably 10 to 20 hours to cure and dry the adhesive layer. In order to accelerate the hardening and drying, the amount of cement may be increased a little, and fast-setting cement or alumina cement can be used.

When the carpet is peeled off, in order to ensure the peeling at the adhesive layer, the synthetic fiber net, woven fabric, non-woven fabric, spun bond,
It is possible to interpose a glass fiber net, a woven fabric, a non-woven fabric, or these nets or fabrics coated with a resin. Further, since the adhesive composition of the present invention is a cement-based adhesive, it does not matter even if some water is attached to the base to which the adhesive composition is applied (applied) or it is in a wet state. No. (In the case of the conventional two-pack type epoxy resin adhesive, the base to which the adhesive is applied needs to be sufficiently dried).

[0021]

EXAMPLES The present invention will be described in more detail below with reference to Examples and Comparative Examples. Parts and% described in these examples are by weight unless otherwise specified.

Example 1 The following compositions were thoroughly mixed with stirring to prepare a resin mortar for a waterproof underlayer. Ordinary cement 150 parts Acronal S-400 * 1 100 parts Defoamer * 2 0.5 parts Water 10 parts Note: * 1 Mitsubishi Yuka Birdishe Co., Ltd. trade name, acrylic ester-styrene copolymer resin emulsion , Tg of resin is 0 ° C or less, resin solid content is 56% * 2 ... San Nopco brand name Nopco 8034

First, after dusting the surface of the concrete pavement board and watering it until the surface becomes wet,
A resin mortar for the waterproof underlayer having the above composition was diluted on the surface with water until the volume was doubled, and then applied as a primer with a roller and dried.

Next, a resin mortar for the waterproof underlayer having the above composition was coated on the dried coated surface three times with a roller so that each wet thickness was 1 mm, and the cured and dried thickness was 2 mm. A waterproof underlayer was formed. The waterproof underlayer had a peel strength of 13 Kgf / 50 mm width measured after standing in air at 20 ° C. for 3 weeks.

Separately, the following compositions were sufficiently stirred and mixed to prepare an adhesive composition. Ordinary cement 200 parts Acronal S-400 * 1 100 parts as resin solids Winilite WB-501 * 2 60 parts Water 40 parts Defoamer * 3 0.3 parts Note: * 1: Mitsubishi Yuka Birdishe Co., Ltd. Name, acrylic ester-styrene copolymer resin emulsion, Tg of the resin is 0 ° C. or less, resin solid content is 56% * 2 ... Idishi Kasei Co., Ltd. trade name, Shirasu foam particles, specific gravity 0.8 to 0. 9, particle size 130 μm * 3 ... San Nopco's trade name Nopco 8034

A slurry of the above adhesive composition was applied to the waterproof layer of the pavement board having the above-mentioned waterproof layer to a wet thickness of about 3 mm, and an artificial lawn (Senshu Rug Co., Ltd.) was immediately applied thereon. After the back surfaces of the product name SA Turf SA-1 made of polypropylene yarn and having a pile length of 8 mm) were overlapped and lightly pressed from above, the adhesive layer was cured and dried by leaving it at room temperature (20 ° C.) for 10 days.

The obtained adhesive carpet (artificial grass) was tested by the test method described in the notes of Tables 1 and 2, and the result was that the peel strength was 6.8 Kgf / 50 mm width. The peel strength after immersion for 48 hours is 5.0 kg.
The width was f / 50 mm, and the peeled surface in this case was not wet with water at all. Further, in both peelings, the adhesive layer was broken, and no abnormality was observed in the waterproof layer. Also, no abnormality was found in the bending test results.

Further, an artificial lawn was adhered again to the fracture surface after peeling using the same method as described above, and a similar peeling test was conducted. The peel strength was 6.9 Kg.
The width was f / 50 mm, and no difference was observed with the peel strength at the time of the first adhesion.

Table 1 shows the composition of the adhesive composition of Example 1 and the results of the adhesive performance test.

Examples 2 to 8 Comparative Examples 1 to 8 Each of the adhesives listed in Tables 1 and 2 was used as an adhesive composition, and otherwise the same method as that described in Example 1 was used. A base waterproofing layer was formed on a concrete pavement board, and an artificial lawn (carpet) was further adhered to the base waterproofing layer by the same method. The adhesive performance test results of the obtained adhesive carpet are shown in Tables 1 and 2, respectively.

[0031]

[Table 1]

[0032]

[Table 2]

Notes to Tables 1 and 2: * 1 ... Mitsubishi Yuka Birdiche Co., Ltd. trade name, acrylic ester-styrene copolymer resin emulsion,
Tg of resin is 0 ° C or less, resin solid content is 56% * 2 ... Idishi Kasei Co., Ltd. trade name, Shirasu foam particles, specific gravity 0.8 to 0.9, particle size 130 μm * 3 ... Dowa Mining Co., Ltd. Company product name KD-80

* 4 ... The artificial lawn adhered to the pavement board is scratched in a rectangular shape with a width of 50 mm and a length of 150 mm to reach the surface of the pavement board, and the end of the rectangular width is peeled off. The maximum peel strength (Kgf / 50 mm width) when peeling by pulling the peeled end in the direction of the long side of the rectangle so as to form an angle of 45 ° with the long side, is shown. The peel strength after immersion in water is represented by the maximum peel strength when the above-mentioned scratched test piece was taken out in water at 20 ° C. for 48 hours and then immediately subjected to the same peel test.

* 5 ... In the above-mentioned peeling test, the peeling surface of the product not soaked in water (this is referred to as "peeling surface before water immersion" for convenience) is visually inspected and evaluated according to the following criteria. ◯: There is no abnormality in the base waterproof layer, and the peeling surface is flat with no unevenness. Δ: There is no abnormality in the undercoat waterproof layer, but the release surface is slightly uneven. ×: There is an abnormality in the waterproof underlayer, and the unevenness of the peeled surface is remarkable.

* 6: An adhesive composition was cast-coated on a Teflon plate so that the wet thickness was 3 mm, left at room temperature for 10 days to cure and dry, and then peeled. Hardened / dried adhesive composition layer test piece (50 mm width x 150 m
The length (m length) is visually inspected for the state of the bent portion when the round bar (diameter 20 mm) is bent by 90 ° so as to envelop it halfway, and evaluated according to the following criteria. ○: There is no abnormality in the bent portion. Δ: There are some cracks in the bent portion. X: The bent portion is cracked.

Example 9 Comparative Examples 9 to 10 Adhesive carpets were produced in the same manner as in Example 1 except that the adhesive compositions shown in Table 3 were used as the adhesive. The obtained adhesive carpet was tested for the same adhesive performance as in Example 1, and the results are shown in Table 3.
It was as shown in.

[0038]

[Table 3]

Note to Table 3: * 1 Mitsubishi Yuka Birdiche Co., Ltd. trade name, acrylic ester / styrene copolymer resin emulsion,
Resin Tg is 3 ° C., resin solid content is 50% * 2 Mitsubishi Yuka Birdishe Co., Ltd. trade name, acrylic ester-styrene copolymer resin emulsion,
Resin Tg is 15 ° C., resin solid content is 50% * 3 ... Idiji Kasei Co., Ltd. trade name, Shirasu foam particles, specific gravity 0.8 to 0.9, particle size 130 μm

Example 10 During the application of the adhesive composition in Example 1, a secondary polypropylene base fabric (Tebac-II 8.5Px8 (418) BExWH manufactured by Tesatsk Co., Ltd.) was overlaid on the underlayer. After that, the adhesive composition was changed to be applied, and otherwise an adhesive carpet was produced in the same manner as in Example 1,
When the peel strength was measured in the same manner, the peel strength was 6.8 Kgf / 50 mm width as in the case of Example 1, but in this case, the adhesive layer was surely formed at the interface with the waterproof layer. Since the peeling was possible and the peeling surface was extremely flat, the re-adhesion of the carpet could be remarkably smoothly performed.

Comparative Example 11 The same artificial lawn as used in Example 1 was formed on the underwater-proof layer of the pavement board obtained by using the same method as in Example 1 until the underwater-proof layer was formed. Using a commercially available epoxy resin two-component adhesive (Konishi Co., Ltd. trade name Konishi Bond E350R, A liquid and B liquid are mixed at a weight ratio of 1: 1 and used, usable time is 60 minutes at 20 ° C.), 500 g / m
^After applying the coating amount of ² and leaving it at room temperature for 3 weeks, the same peeling test as in Example 1 was performed. As a result, the base waterproof layer peeled from the concrete pavement board (peel strength 15 Kgf / 50 mm width). Therefore, in this case, when the artificial lawn is to be re-bonded, it is necessary to re-apply the base waterproof layer and then apply the adhesive to bond the artificial grass.

In the above-mentioned method, a commercially available Pinocchio Sand S-20 (trade name of Senshu Rug Co., Ltd., polypropylene yarn, pile length 19 m) is used as an artificial lawn to be bonded.
m) is used and the other method is the same as above,
When a peeling test was performed on the obtained adhesive carpet in the same manner, a part of the artificial lawn was torn, and a part of the adhesive layer with the pile adhered remained on the waterproof underlayer, and the artificial lawn was left on it as it was. Could not be re-bonded.

[0043]

EFFECT OF THE INVENTION The adhesive composition of the present invention can firmly adhere carpet such as artificial grass to concrete and the like, and can easily control the adhesive peel strength by adjusting the amount of cement and the amount of foam particles. The adhered carpet can be easily peeled off without destroying the underwater waterproof layer, and re-adhesion of the carpet is extremely easy.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Takao 3-1-2, Bingo-cho, Chuo-ku, Osaka City, Osaka Prefecture Senshu Stream Co., Ltd.

Claims (1)

[Claims] 1. An aqueous emulsion of a resin having a glass transition point of 5 ° C. or less, containing 150 to 450 parts by weight of a hydraulic inorganic cement and 20 to 160 parts by weight of foam particles with respect to 100 parts by weight of a resin solid content of the emulsion. An adhesive composition for carpets, which comprises: