JP2008222820A - Curable composition and structure body using it for adhesion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a curable composition having adhesion performance equal to or more of a conventional vinyl acetate solvent based adhesive without using an organic solvent in which a vessel after usage does not become a waste. <P>SOLUTION: The curable composition containing cement, re-emulsification resin powder and calcium carbonate is used. Since generation of an industrial waste and problem of use of an organic solvent are not generated while having performance equal to or more of the conventional vinyl acetate resin based solvent adhesive, it can be preferably used when a woody material based body to be attached such as tree brick is applied to alkaline inorganic underlying such as mortar. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a curable composition useful particularly when adhering an adherend such as a wooden material to an alkaline inorganic base, and a structure in which the adherend is bonded to an alkaline inorganic base using the curable composition. Is.

  Vinyl acetate resin-based adhesive is a solvent in which vinyl acetate resin is dissolved in an organic solvent such as methanol, and it has features such as being hard to drip, good initial fit, and being able to adjust to unevenness because it can be applied thickly. Have. Therefore, for example, it has been used as an adhesive when constructing a wooden brick on a vertical mortar surface in a construction site.

  Solvent adhesives, on the other hand, require certain equipment and measures during storage and handling because of their flammability and harmfulness to the human body. As a result, it has become possible to avoid the use in homes in particular, and a shift from solvent-based adhesives to water-based adhesives has been attempted in various fields.

  However, when using a water-based acrylic resin emulsion adhesive when constructing wooden bricks, it takes a lot of time to dry the interior, so it cannot be applied to the wall thickness, and the problem that unevenness adjustment cannot be made sufficiently occurs. . Also, as a problem common to both vinyl acetate resin-based adhesives and acrylic resin-based emulsion adhesives, containers after use (usually metal cans and plastic cans are used, and the resin adheres and remains after use. ) Will become industrial waste.

  Patent Document 1 discloses an aqueous mastic-type adhesive composition, but considering the properties, it is appropriate to consider that the composition is supplied in a container in which a part of metal or plastic is used. Therefore, the container after use becomes industrial waste.

Further, Patent Document 2 proposes a modified silicone adhesive, which describes that the adhesiveness to various substrates is superior to that of a vinyl acetate solvent-based adhesive. On the other hand, the modified silicone resin does not have sufficient alkali resistance, and the durability is not sufficient when the base material is an alkaline inorganic material such as concrete or mortar. Moreover, it is a type of adhesive that cures due to moisture, and since containers such as metal cans and plastic cans are used, there is a problem of becoming industrial waste after use.
Japanese Patent Laid-Open No. 2002-265921 JP 2000-239645 A

  The present invention has an adhesive performance equal to or better than that of a conventional vinyl acetate resin-based solvent-type adhesive without using an organic solvent. The structure used for is provided.

  The present inventors have examined mortar in which re-emulsified resin powder and various aggregates are mixed in cement. However, since the cured product is brittle, it cannot follow the dimensional change of the adherend such as a wooden material and is easily separated. There was a problem. As a result of repeated studies, when preparing mortar, by adding calcium carbonate in addition to cement and re-emulsified resin powder, the physical properties of the cured product are improved and it becomes possible to follow the dimensional change of the adherend. The present inventors have found that it has a performance capable of replacing the vinyl acetate solvent type adhesive. That is, the present invention includes a curable composition containing cement, a re-emulsifying resin powder, calcium carbonate, and an adherend of a wood material such as a wooden brick on an alkaline inorganic base using the curable composition. Is a bonded structure.

  Since the curable composition of the present invention does not use an organic solvent, the curable composition is easy to store and safe during work. In addition, the organic solvent does not dissipate after construction, so it can be used with peace of mind. Furthermore, since each material constituting the curable composition of the present invention is supplied in the form of a paper bag and can be prepared by the same operation as the preparation of cement, the metal or plastic to which the resin adheres only after the paper bag comes out after use. No industrial waste is generated. Further, since it has excellent unevenness adjusting power and alkali resistance, it is particularly useful as an adhesive for constructing an adherend of a wood material such as a wooden brick on an alkaline inorganic base.

  The cement used in the curable composition of the present invention is widely used in the construction industry and can be easily obtained. The type of cement is not particularly limited, but usually Portland cement may be used, and an appropriate cement is selected as necessary.

  The re-emulsified powder resin is a resin obtained by pulverizing the water of various resin emulsions obtained by emulsion polymerization by spray drying. Specifically, acrylic resin, acrylic-veova copolymer resin, vinyl acetate resin, vinyl acetate-veova-acrylic copolymer resin, ethylene-vinyl acetate copolymer resin, vinyl acetate-veova copolymer resin, styrene-butadiene copolymer resin A powdery re-emulsified powder resin obtained by spray-drying etc. can be used. Among these, from the viewpoint of alkali resistance, acrylic resin, acrylic-veova copolymer resin, vinyl acetate-veova-acrylic copolymer resin, ethylene-vinyl acetate copolymer resin, vinyl acetate-veova copolymer resin, styrene-butadiene copolymer resin. Is preferred. As for the compounding quantity of the re-emulsification powder resin with respect to 100 weight part of cement, 10-200 weight part is preferable. When the amount is less than 10 parts by weight, the adhesion force to the adherend is not sufficiently exhibited, which is not preferable. If it exceeds 200 parts by weight, the curing rate of the cement and the water resistance performance of the cured product will be unfavorable.

  The curable composition of the present invention is characterized by further containing calcium carbonate in addition to the cement and the re-emulsified resin powder. By adding calcium carbonate, flexibility is imparted to the cured product. As for the compounding quantity of the calcium carbonate with respect to 100 weight part of cement, 10-200 weight part is preferable. Within this range, both the flexibility and adhesion of the cured product can be achieved.

  In addition to the materials described above, the curable composition includes various aggregates such as cinnabar and gypsum that are usually used in preparing mortar, hardening accelerators such as antifoaming agents and sodium silicate, and increases in methylcellulose and the like. A viscous agent etc. can be mix | blended.

  The curable composition can be obtained by mixing the above materials and water. The mixing method is not particularly limited, and it may be sufficiently stirred using a hand mixer, a trowel or the like until uniform.

  The curable composition of the present invention can be used in various applications where a vinyl acetate resin solvent-based adhesive has been used. Moreover, since it has the outstanding unevenness adjustment power and alkali resistance, it is especially useful as an adhesive agent which constructs a wooden brick etc. to an alkaline inorganic base | substrate.

  The present invention will be described below with reference to examples and comparative examples. In addition, this invention is not limited to an Example.

  35 parts by weight of ordinary Portland cement, 15 parts by weight of re-emulsified powder resin (made by Nippon SC Co., Ltd., trade name AP300S, vinyl acetate-veova-acrylic copolymer resin), calcium carbonate (made by Bihoku Flour & Chemical Co., Ltd., trade name) BF-200) 35 parts by weight, No. 7 cinnabar 30 parts by weight, and water 40 parts by weight were mixed to obtain a curable composition of Example 1. Based on the composition described in Table 1, curable compositions of Examples 2 and 3 and Comparative Examples 1 and 2 were similarly prepared. As Comparative Example 3, a vinyl acetate resin-based adhesive (with metal can) was used, and as Comparative Example 4, an acrylic resin emulsion-type adhesive (with metal can) was used. About each curable composition, the performance was evaluated in accordance with the following method.

Test method
The deviation was performed in accordance with the test method of 5.3 “deviation” of JISA5537. A sample with a deviation within 5 mm was evaluated as ◯.
Adhesion strength It was performed in accordance with the test method of 5.2.5 “Tensile splitting adhesive strength ” of JISA5537. Those having an adhesive strength of 20 N / mm or more were evaluated as ◯, and those having an adhesive strength of less than 20 N / mm were evaluated as ×.
Non-land adjustability In the above-mentioned adhesion strength test, the same procedure as in the adhesion strength test was performed except that the thickness of the adhesive layer was 5 mm and the curing time was 7 days. Those having an adhesive strength of 20 N / mm or more were evaluated as ◯, and those having an adhesive strength of less than 20 N / mm were evaluated as ×. In addition, it was clear that what the said adhesive strength became x evaluation becomes x evaluation also in this test, and it did not measure.
Work environment The organic solvent that did not contain was evaluated as ○, and the one that contained organic solvent as ×.
Paper bags are used as the form of industrial waste generation packaging, and those that do not become industrial waste after use were evaluated as ○. Metals and plastics are used as packaging forms, and those that generate industrial waste after use were evaluated as x.

  The curable compositions of the examples were good in each performance. In Comparative Examples 1 and 2, the adhesive strength was insufficient. Since Comparative Example 3 contained an organic solvent, the working environment was poor, and the point that the container became industrial waste was also unsuitable. In Comparative Example 4, the unevenness adjustment power is insufficient, and the point that the container becomes industrial waste is also unsuitable.

Claims (3)

  A curable composition comprising cement, re-emulsified resin powder, and calcium carbonate.   A structure, wherein the adherend is bonded to an alkaline inorganic base using the curable composition according to claim 1.   The structure according to claim 2, wherein the adherend is a wood material.