JP3397642B2 - Adhesive-type water expansion seal material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tacky-adhesive type water-expandable sealing material for stopping joint water.

[0002]

2. Description of the Related Art Conventionally, an adhesive water-expandable sealing material has been used for a joint portion made of concrete, iron, non-ferrous metal, vinyl chloride or the like. In such an adhesive water-swelling sealant, a highly water-absorbent resin as a water-swelling agent is used in addition to a rubber or an elastomer as a base, and a hydrophilic filler is used in combination to exhibit a desired water-swelling function.

A high water expansion type adhesive water expansion seal material is also known. In such an adhesive-type water-expandable sealing material, a vulcanizing agent is added and vulcanized at the time of molding, and the product strength is improved (JP-A-3-59087, JP-A-3-253669).

[0004]

In order to cause the pressure-sensitive adhesive water-expandable sealing material to expand by water only with the hydrophilic filler, it is necessary to add a large amount of the filler. However, the pressure-sensitive water-expandable sealing material thus obtained has a low water expansion rate and a low function as an adhesive sealer.

In order to prevent such functional deterioration, a highly water-absorbent resin as a water-swelling material can be contained in the adhesive water-swelling sealant. However, the highly water-absorbent resin is expensive, and the material unit price of the obtained adhesive-type water-expandable sealing material is high in cost.

Further, when a highly water-absorbent resin is added, the obtained sealing material exhibits a high expansion property. However, since such a sealing material is highly expansive, it has low strength and may self-disintegrate. In order to increase the strength of the adhesive water-expandable sealing material, it is necessary to add a vulcanizing agent and vulcanize it during molding. However, the vulcanization process complicates the production process of the adhesive water-expandable sealing material and imposes restrictions on the function of the sealing material.

The present invention has developed an adhesive type water-expandable sealing material which does not require the addition of a superabsorbent resin or a vulcanization step, and has a high water expansion ratio and a high water expansion rate, and an adhesive type excellent in strength after water expansion. The purpose is to obtain a water-expandable sealing material.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a tacky-adhesive type water-expandable sealing material for stopping joint water, and the tacky-adhesive type water-expandable sealing material comprises 100 parts by weight of a base containing rubber. ,
Hydrophilic filler (excluding highly water-absorbent resin) 30 to 300 parts by weight, a tackifier 10 to 200 parts by weight, and a molded article obtained by molding a mixture containing 0.1 to 30 parts by weight of a surfactant, The base comprises at least one rubber selected from the group consisting of regenerated butyl rubber and partially crosslinked butyl rubber.
The content of the recycled butyl rubber is 10% by weight or more of the base, and the content of the base is not
Situations that Der vulcanization.

The present inventor has developed an adhesive-type water-expandable sealant having an extremely excellent water-stopping effect by causing a hydrophilic filler to function as a water-swelling agent and a surfactant to function as a water-expansion rate adjusting agent. They have found that they can be obtained and have reached the present invention.

In the pressure-sensitive water-expandable sealing material of the present invention, the respective additives sufficiently share their functions, the water expansion ratio and the water expansion rate are high, and the strength after water expansion is excellent. . Further, the adhesive water-expandable sealing material of the present invention,
It is inexpensive because there is no need to use an expensive water-absorbing resin. Further, such a water expansion sealing material can freely control the water expansion speed and does not cause self-destruction due to water expansion. Furthermore, since such a water-expandable sealing material can fully exhibit the function of the sealing material in a non-vulcanized state, it does not require a vulcanization step during manufacturing.

In a preferred embodiment of the present invention, the rubber-containing base contains at least 70% by weight of at least one rubber selected from the group consisting of regenerated butyl rubber and partially crosslinked butyl rubber. It contains butyl rubber other than partially crosslinked butyl rubber in a proportion of 30% by weight or less. Such an adhesive-type water-expandable sealing material exhibits good adhesion to fresh concrete and exhibits a still better water-stopping effect with fresh concrete.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION As the reclaimed rubber, various reclaimed rubbers such as butadiene styrene rubber can be used, and a representative example thereof is reclaimed butyl rubber. Also,
Representative examples of the partially crosslinked rubber include partially crosslinked butyl rubber.

If the base contains 70% by weight or more of at least one rubber selected from the group consisting of regenerated butyl rubber and partially crosslinked butyl rubber, butyl rubber may be mixed in the balance at 30% by weight or less, if desired. May be.
Also, in some cases, various elastomers may be mixed in instead of butyl rubber. If the recycled butyl rubber content in the base material is less than 10% by weight, the adhesive water-expandable sealing material obtained will have poor adhesion to ready-mixed concrete.

As the hydrophilic filler, silicic acid, clay, silicate, bentonite, surface-treated calcium carbonate, magnesium hydroxide, magnesium oxide, calcium oxide, etc. may be used alone or as a blend of two or more kinds. it can.

The amount of hydrophilic filler added is 30 to 300.
Parts by weight, preferably 50 to 150 parts by weight are desirable. If the addition amount is less than 30 parts by weight, the water expansion ratio of the pressure-sensitive adhesive water-expansion sealing material decreases. If the amount added exceeds 300 parts by weight, the water expansion ratio increases, but the tackiness of the sealing material is impaired.

As the tackifier, liquid rubber (polybutadiene, polyisoprene, polychloroprene), coumarone resin, phenol resin, terpene resin, aromatic hydrocarbon resin, aliphatic hydrocarbon resin, polybutene, etc. may be used. it can.

The tackifier is added in an amount of 10 to 200 parts by weight, preferably 50 to 150 parts by weight. If the amount added is less than 10 parts by weight, the adhesive strength of the adhesive water-expandable sealing material will be insufficient. If the added amount exceeds 200 parts by weight,
Although the adhesive strength of the seal material increases, the sagging deformation of the seal material increases and the water expansion ratio decreases.

The surfactant is preferably a water-soluble surfactant. Further, this surfactant may contain a water-dispersible surfactant as long as it sufficiently functions as a water expansion rate adjusting agent according to the present invention. Examples of the water-soluble surfactant include anionic surfactants such as carboxylates and sulfonate phosphates, cationic surfactants such as amine salts and quaternary ammonia salts, oxyethylene-based or oxypropylene-based surfactants. Nonionic surfactants are included.

Nonionic surfactants are particularly preferred as regulators of water expansion rate. Further, such a nonionic surfactant can increase the strength of rubber as a sealing material, and is excellent in easiness of mixing with rubber and vulcanization control.

Further, in the present invention, the nonionic surfactant is at least one selected from the group consisting of a polymer of ethylene oxide, a polymer of propylene oxide, and a block copolymer of ethylene oxide and propylene oxide. It is preferred to include a polymer of the species. This is because these polymers are water-soluble and are suitable for adjusting the water expansion rate.

The amount of these surfactants added is 0.1 to 3
0 parts by weight, preferably 2.0% nonionic surfactant.
Adjust between ~ 15 parts by weight. If the amount added is less than 0.1 part by weight, the water expansion rate and the water expansion rate will decrease. If the addition amount exceeds 30 parts by weight, the water expansion rate becomes remarkably high,
The strength of the sealing material also decreases.

In addition to the above-mentioned essential additives, a filler, a softening agent, a plasticizer, a coloring agent, an antiaging agent, a processing aid, etc. may be added to the pressure-sensitive adhesive water-swelling sealant of the present invention. . These additives, using the techniques known in the art,
It can be added in any ratio. By using such an additive, it is possible to design an adhesive water-swelling sealant having various functions.

The adhesive water-expandable sealing material of the present invention can be produced by uniformly kneading a base material and various additives with a pressure kneader and extruding. In addition to such a method, the sealing material of the present invention can be produced by a generally known method such as press molding or calendering molding after kneading using an open kneader, a Banbury mixer or the like. .

[0024]

The present invention will be described in more detail below with reference to examples. Examples 1 to 7 IIR (60 parts by weight of regenerated butyl rubber, 20 parts by weight of partially crosslinked butyl rubber, 20 parts by weight of butyl rubber) was used as the rubber base. A mixture of 10 parts by weight of silicic acid and 90 parts by weight of bentonite was used as the hydrophilic filler. A mixture of 20 parts by weight of a synthetic terpene-based tackifier and 80 parts by weight of polybutene was used as the tackifier. Polyoxypropylene was used as the surfactant. A naphthenic oil was used as a softening agent. Calcium carbonate was used as the filler.
Sodium polyacrylate was used as the highly water-absorbent resin.

These agents were blended in the proportions shown in Table 1 and kneaded uniformly using a pressure kneader to form a compound. Next, these compounds were extruded to produce the adhesive water-expandable sealing materials of Examples 1 to 7.

With respect to the obtained adhesive water-expandable sealing material,
The water expansion rate and the water expansion rate were measured, and the shape after the water expansion was observed. The results are shown in Table 1.

[0027]

[Table 1]

The water expansion ratio was calculated by the following formula.

[0029]

[Equation 1]

The water swelling rate was defined as the number of days required until the volume reached its maximum after the sample was immersed in tap water.

Regarding the shape after water expansion, the shape retention of the sample was observed when the water expansion ratio became maximum.

The adhesive strength means the strength of the peeling force when the same sample is adhered and then peeled off.

Sagging deformation refers to the degree of deformation of a sample adhered to a flexible board in an oven at 80 ° C.

The adhesive water-expandable seal materials of Examples 1 and 2 have water expansion ratios of 1.05 and 2.0, respectively.
Other performances were also sufficient as the sealing material.

The pressure-sensitive adhesive water-expandable sealing material of Example 3 was slightly inferior in adhesive strength, but had a good water expansion ratio of 1.7.

The pressure-sensitive adhesive water-expandable sealing material of Example 4 was slightly expensive, and although the sagging deformation was slightly inferior, the water expansion ratio was good at 1.3 and did not collapse.

The adhesive water-swelling seal materials of Examples 5 and 6 had a water expansion rate of 45 days and 3 days and a water expansion ratio of 1.3 and 1.8, respectively. The adhesive water-expandable sealing materials of both Examples had a sufficient function as a sealing material.

The adhesive-type water-swelling sealing material of Example 7 has a water-swelling ratio of 2.7 times by adding a small amount of a highly water-absorbent resin because the surfactant sufficiently acts even if the hydrophilic filler is small. The magnification is shown. This adhesive water swelling sealant
It had high self-adhesiveness without self-disintegration.

The adhesive water-expandable sealing materials of Examples 1 to 7 were
Since each of them contains recycled butyl rubber as a main component, they adhered well to concrete.

Comparative Examples 1 to 9 In addition to the compounding agent used in the examples, sulfur was used as the vulcanizing agent, and the vulcanization accelerator was a mixture of 30% by weight of sulfenamide and 70% by weight of thiuram. .

These agents were blended in the proportions shown in Table 2 and a pressure-sensitive water-expandable sealing material was produced in the same manner as in the examples. However, the adhesive water-expandable sealing material of Comparative Example 3 was manufactured by extrusion-molding and then vulcanizing in a vulcanizing tank at 170 ° C. for 10 minutes.

These adhesive water-swelling seal materials were tested in the same manner as in the examples. The results are shown in Table 2.

[0043]

[Table 2]

The adhesive type water-expandable sealing material of Comparative Example 1 has a low water expansion ratio of 1.03 and a low water expansion rate.

The adhesive-type water-expandable seal material of Comparative Example 2 does not function as a seal material because the seal material self-disintegrates after water expansion.

The adhesive-type water-expandable sealing material of Comparative Example 3 has poor productivity and high cost. In addition, since the adhesive water-expandable sealing material of Comparative Example 3 is vulcanized, the ability to follow unevenness is insufficient, and the performance as a sealing material cannot be fully exhibited.

The adhesive water-expandable sealing materials of Comparative Examples 4 to 9 are
The same chemicals as the adhesive water-swelling sealant of the present invention are used, but the compounding amount is changed.

The adhesive type water-expandable sealing material of Comparative Example 4 has a low water-expansion ratio of 1.02 because the hydrophilic filler is small.

The adhesive-type water-expandable sealing material of Comparative Example 5 contained a large amount of hydrophilic filler, so the adhesive strength of the sealing material was insufficient and the shape after water expansion was almost on the verge of collapse.

The adhesive type water-expandable sealing material of Comparative Example 6 lacked the adhesive force because the amount of the tackifier was small.

The adhesive type water-expandable sealing material of Comparative Example 7 contains a large amount of tackifier, so that the sagging deformation is large and the cost is high.

The adhesive type water-expandable sealing material of Comparative Example 8 has a low water expansion ratio and a low water expansion rate because the surfactant is small.

The adhesive type water-expandable sealing material of Comparative Example 9 contained a large amount of the surfactant, so that it was difficult to maintain the shape after the water expansion, and the water expansion rate was remarkably high.

[0054]

INDUSTRIAL APPLICABILITY As described above, the pressure-sensitive water-expandable sealing material of the present invention is excellent in water expansion ratio, water expansion rate, and strength after water expansion. The adhesive water-expandable sealing material of the present invention uses an inexpensive material without using an expensive highly water-absorbing resin. According to the present invention, it is possible to realize an appropriate balance between the water expansion ratio and the water expansion speed of the pressure-sensitive water-expansion sealing material with high productivity.

The adhesive water-expandable seal material of the present invention retains its shape after water expansion, does not collapse, and has other functions as a seal material higher than those of conventional products. Also,
When such an adhesive water-expandable seal material contains a predetermined amount or more of reclaimed rubber, an adhesive water-expandable seal material having excellent adhesion to fresh concrete can be obtained, which can further improve the water stoppage of concrete joints. it can.

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) E04B 1/682 C09K 3/10

Claims (4)

(57) [Claims] 1. A visco-adhesive type water-expandable sealant for stopping joint water, comprising 100 parts by weight of a rubber-containing base and a hydrophilic filler.
(Excluding highly water-absorbent resin.) A molded product obtained by molding a mixture containing 30 to 300 parts by weight, a tackifier 10 to 200 parts by weight, and a surfactant 0.1 to 30 parts by weight, wherein the base is Contains at least 70% by weight of at least one rubber selected from the group consisting of regenerated butyl rubber and partially crosslinked butyl rubber, and the regenerated butyl rubber occupies 10% by weight or more of the base. Agent is unvulcanized
Characterized in der Rukoto, adhesive type water swelling sealing material. 2. The adhesive / water-expandable sealing material according to claim 1, wherein the base material contains butyl rubber other than regenerated butyl rubber and partially crosslinked butyl rubber in a proportion of 30% by weight or less. . 3. The pressure-sensitive adhesive-type water-expandable sealant according to claim 1, wherein the surfactant contains a nonionic surfactant. 4. The at least one polymer selected from the group consisting of a polymer of ethylene oxide, a polymer of propylene oxide, and a block copolymer of ethylene oxide and propylene oxide, as the nonionic surfactant. The tacky-adhesive water-expansion sealing material according to claim 3, comprising: