JP3490014B2 - Joint coating method using surface treatment agent for sealing material - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treating agent which is applied to the surface of a sealing material to modify its surface properties, and a coating method for performing joint treatment using the same. It is about. 2. Description of the Related Art In the interior and exterior of buildings, it has been frequently practiced to protect the skeleton and improve the appearance by various kinds of coating. In the case of such coating, various types of materials such as mortar and building materials are used for the surface of the building to be coated, but especially when coating is performed even at joints, the joints of the building materials are sealed. In many cases, it is treated with a material and the entire surface is coated with a finishing material. [0003] In the case described above, a finish coating film must be formed so as to cover both the building material portion and the sealing material portion. However, such a sealing material contains a plasticizer in its components. Therefore, when the coating of the finishing material is directly applied to the surface of the sealing material, the plasticizer in the sealing material is transferred to the finishing material coating over time, and the finishing material coating on the sealing material is plasticized. Because of the softness, contaminants in the air may adhere to the softened finish coating film and significantly impair its appearance. Further, since each building material expands and contracts due to cold and warm, the sealing material also expands and contracts following such expansion and contraction. Therefore, when the finish coating film on the sealing material cannot follow the expansion and contraction of the sealing material, that is, when the finish material film has relatively low elasticity, cracks may occur in the finish material coating film. On the other hand, if a material having a large elasticity is used as the finish coating film on the sealing material, the problem of cracks can be solved. However, similar to the softening of the finish material coating due to the migration of the plasticizer, the elasticity is high. In the case of a finish coating film, there is a problem that the stainability is poor. Furthermore, there are many types of sealing materials, and depending on the type of resin in the composition, the adhesion to the finish coating film is insufficient, and the finish coating film may swell or peel over time. Was. [0005] In order to solve the above problems, a certain treatment agent is applied to the surface of the sealing material to prevent the migration of the plasticizer and the cracking of the coating film of the finishing material, and further, to prevent the coating film of the finishing material from coating. Attempts have been made to improve the adhesion between the material and the sealing material, but no effective material has yet been obtained. [0006] Therefore, the problem to be solved by the present invention is to prevent the plasticizer in the sealing material from migrating to the finish coating film by applying it to the surface of the sealing material, and to expand and contract the sealing material. effect relieve of hardly cracking of finish coating, further coating the joints with <br/> sealant surface treatment agent for improving the adhesion between the sealant and the finish coating film Is to get the painting method to do. [0007] In order to solve the above-mentioned problems, the present inventors use a flexible epoxy resin to adjust the cross-linking density and electric polarity thereof. Thus, the present inventors have found that a plasticizer transfer prevention effect, a displacement reduction effect of a sealing material, and an adhesion improving effect can be simultaneously provided. That is, the epoxy equivalent is 300 to 200
An epoxy resin base containing 10 to 90% by weight of a dimer acid-modified epoxy resin having an active hydrogen equivalent of 100 to 2%.
00 polyoxypropylene diamine, polyoxypro
Pyrene triamine, polyoxypropylene tetraamine
An aliphatic polyamine-based curing agent selected from the group consisting of a cured product having a gel fraction of 30 to 85% and an elongation of the coating film of 100 to 500.
% Of the surface treatment agent of the sealing material mixed so as to be%. DETAILED DESCRIPTION OF THE INVENTION The dimer acid-modified epoxy resin used in the present invention is obtained by converting unsaturated fatty acids having high linoleic acid and linolenic acid contents such as tall oil fatty acids into DielsAlder.
The following chemical formula obtained by polymerization by the reaction: Is a polymerized fatty acid containing a so-called dimer acid having 36 carbon atoms as a main component, and an esterification reaction of this with an epoxy resin. Examples of the epoxy resin used for such an esterification reaction include glycidyl ether epoxy resins such as bisphenol A epoxy resin and bisphenol F epoxy resin. The dimer acid-modified epoxy resin contains 1
Glycidyl ether epoxy resin such as bisphenol A epoxy resin and bisphenol F epoxy resin, cycloaliphatic epoxy resin, glycidyl ester epoxy resin, glycidylamine epoxy resin Etc. can be used as appropriate. In addition, acrylic resin, urethane resin, polyester resin, urea resin, butyl rubber and the like can be appropriately blended to such an extent that the effect of the present invention is not impaired. When the content of the dimer acid-modified epoxy resin in the main agent is less than 10%, the ability to follow the sealing material is lost, and cracks occur in the sealing material surface treatment agent coating film. Therefore, when the finish material coating film is hard, cracks also occur in the finish material coating film. If it is more than 90%, the migration of the plasticizer in the sealing material cannot be prevented, and the finish coating film on the sealing material is plasticized, and dust in the air adheres to the plasticized portion, thereby contaminating the plasticized portion. . The epoxy equivalent of the dimer acid-modified epoxy resin is from 300 to 2,000. Epoxy equivalent is 300
If it is lower, the crosslink density of the sealant surface treatment agent coating film becomes too high, resulting in loss of flexibility. Therefore, the ability to follow the sealing material is lost, and cracks occur in the sealing material surface treatment agent coating film. As a result, cracks may occur in the finish coating film. When the epoxy equivalent is higher than 2,000, the crosslink density becomes low, so that the transfer of the plasticizer cannot be prevented. Therefore, the finish coating film on the sealing material is plasticized, and the plasticized portion is contaminated by dust in the air. On the other hand, the aliphatic polyamine-based curing agent is not particularly limited as long as it is an aliphatic polyamine having an active hydrogen equivalent of 100 to 200, but is not limited to polyoxypropylene diamine, polyoxypropylene triamine,
A chain aliphatic amine such as polyoxypropylene tetraamine is preferred. At this time, when the active hydrogen equivalent is lower than 100, the molecular weight of the aliphatic polyamine is low, so that the coating film of the surface treatment agent for the sealing material becomes brittle and may not follow the displacement of the sealing material and may cause cracks. On the other hand, when the active hydrogen equivalent is higher than 200, the molecular weight of the aliphatic polyamine is high, so that the crosslink density of the sealant surface treatment agent coating film is low, and the effect of preventing the migration of the plasticizer is reduced. Therefore, the finish coating film on the sealing material is plasticized,
The plasticized part is contaminated by dust in the air. In the present invention, the cured product obtained by using the above-mentioned dimer acid-modified epoxy resin and an aliphatic polyamine-based curing agent has a gel fraction of 30 to 85% and a coating film elongation of 100 to 500%. % Is applied to the surface of the sealing material to form a coating film exhibiting the above-described effects. Here, the gel fraction is a ratio of an acetone-insoluble component when a cured product obtained by mixing a main agent and a curing agent and allowed to stand at room temperature for one week is extracted with acetone. Gel fraction 30
%, The crosslink density of the sealant surface treatment agent coating film is low, and transfer of the plasticizer cannot be prevented. Therefore,
The finish coating film on the sealing material is plasticized, and the plasticized portion is contaminated by dust in the air. Gel fraction 85
%, The flexibility of the coating film of the surface treatment agent for the sealing material is lost and the film becomes brittle, so that there is no followability to the sealing material, and cracks occur in the coating film of the surface treatment agent for the sealing material. As a result, cracks may occur in the finish coating film. Next, the elongation percentage is a value measured at a thickness of 1 mm in accordance with JISK 5400 8.8 “Tensile strength and elongation percentage”. If the elongation is less than 100%, the sealing material cannot follow the displacement of the sealing material, and cracks occur in the sealing material surface treatment agent coating film. As a result, cracks may occur in the finish coating film. If the elongation is more than 500%, the crosslink density is reduced and the migration of the plasticizer cannot be prevented. Therefore, the finish coating film on the sealing material is plasticized,
The plasticized portion may be contaminated by dust in the air. Further, when the finish material coating film is hard, it is impossible to follow the displacement of the sealing material, which may cause cracks. In the present invention, the plasticizer is determined by the electric polarity of the polyester bond and the glycidyl group in the dimer acid-modified epoxy resin and the gel fraction of the coating film of the surface treatment agent for the sealing material to be formed, that is, the crosslink density. It is presumed that the migration of the refuge is prevented. On the other hand, if the cross-linking density of the coating film is too high, it is difficult to follow the displacement of the sealing material, and in the present invention, this is solved by using the effect of imparting flexibility to the coating film by dimer acid modification. are doing. As a result, even if a relatively hard finish coating material is used, the finish coating film does not crack since the surface treatment agent coating reduces the displacement of the sealing material. Therefore, it is possible to avoid the problem of contamination when a highly elastic finish is used to prevent cracks. The finish coating material that can be used in the present invention is not particularly limited as long as it is generally used for painting buildings. For example, JIS K 5654 “Acrylic resin enamel”, JIS K 5656 "Building polyurethane resin paint", JIS K 5658 "Fluorine resin paint for building", JIS K 5660 "Glossy synthetic resin emulsion paint", JI
S K 5663 “Synthetic resin emulsion paint”, JIS K 5667 “Multicolored paint”, JIS K 5668 “Synthetic resin emulsion paint”, JIS A 6909 “Architectural finish coating material” can be suitably used. In particular, a hard type is preferable in consideration of the problem of contamination, but an elastic type can also be used for that purpose. In addition, in the present invention, a reactive diluent, an antiseptic, a fungicide, an antialgal agent, an antifoaming agent, a leveling agent, an anti-settling agent, an anti-sagging agent generally used as an additive for epoxy resin coatings In addition, a slight amount of pigment and a pigment dispersant can be appropriately compounded so that the effect of the present invention is not impaired so that the applied portion becomes clear. Using the surface treatment agent for a sealing material of the present invention, joint treatment coating can be carried out as follows.
As the sealing material, a one-component type or two-component type modified silicone-based, polyurethane-based, acrylic urethane-based or the like can be suitably used. These sealing materials are cast by a conventional method using a sealing gun or the like. After the sealing material is cast and the sealing material is dried and cured, the surface treatment agent for the sealing material of the present invention is applied. Depending on the type of the sealing material, the coating interval time may fluctuate somewhat, but is generally applied at intervals of about 3 to 7 days. The application method is not particularly limited, but is usually performed by brush application, and 3 to 3 times depending on the sealing material surface and joint width.
Apply about 10 mm widely. The coating amount at this time is 30 to 200 g / m ^{2 in} terms of the total solid content of the main agent and the curing agent. The interval between the steps from application of the surface treatment agent for the sealing material to application of the finish coating material is about 1 to 7 days. Thereafter, the above-mentioned various finish coating materials are appropriately applied based on the respective application specifications, so that a joint treatment coating film free from problems such as dirt, cracks, peeling, and swelling can be formed. In addition, using putty or cold gauze as an auxiliary member,
It is also possible to use the large wall method. Examples of the present invention will be described below. Using the raw materials shown in Table 1 and the formulations shown in Table 2, each sealant surface treatment agent was produced. These were tested based on the following method. [Table 1] [Table 2] * Coating film bending test * Two flexible boards each having a thickness of 6 mm are put together and
After applying a polyurethane-based sealing material with a thickness of 6 mm to a width of 1 cm around the butted part, cure for 7 days,
Subsequently, each of the sealing material surface treating agents was applied to the surface of the sealing material at a coating amount of 150 g / m ^{2 to} obtain a test piece. After curing for one week, the flexible plate was bent at 45 ° around the sealing material, and the sealing material surface treatment agent was visually checked for cracks. At this time, those that did not generate cracks were evaluated as ○, and those that generated cracks were evaluated as x. The results are shown in Table 3. * Coating film contamination test * A test piece was prepared in the same manner as in the coating film bending test. The test piece was allowed to stand at a temperature of 80 ° C. for 7 days, taken out, and allowed to stand at room temperature. In a state, put it horizontally,
After spraying No. 8 black silica sand on the surface of the surface treatment agent for the sealing material, it was set upright and the amount of No. 8 black silica sand adhered was visually observed. At this time, those that did not adhere at all were evaluated as O, and those that adhered were evaluated as X. The results are shown in Table 3. * Heat / cooling repetition test * A base having a 10 mm × 10 mm square joint groove shown in FIG. 1 was prepared using a 10 mm thick cement-based dry building material. Next, after applying a polyurethane-based sealing material to the joint grooves, curing for 7 days, further applying a surface treatment agent for each sealing material, curing for 1 day, and then, as a finish material coating film, a hard acrylic emulsion. Paint (PVC = 20%, Tg = 4
C.), and cured for 7 days. The test specimens thus prepared were subjected to a test according to JIS A 6909 “Finishing coating material for building” 6.11 “Repeated test of heating and cooling”. When the crack or swelling of the finish coating film was not generated, the evaluation was ○, and when the crack or swelling was generated, the evaluation was X. The results are shown in Table 3. [Table 3] (Examples 1 and 2) The coating of the surface treatment agent for the sealing material in the coating film bending test and the coating film contamination test was in the range of the numerical limitation of the present invention. Did not cause contamination. (Comparative Example 1) Since the active hydrogen equivalent of the curing agent was lower than the range specified in the present invention, the coating film of the surface treatment agent for the sealing material became brittle, and cracks occurred in the coating film bending test. (Comparative Example 2) The ratio of the dimer acid-modified epoxy resin in the main resin was lower than the range specified in the present invention, and as a result, the elongation percentage of the coating film of the surface treatment agent for the sealing material was in the range specified in the present invention. Because of the lowering, the coating film of the surface treatment agent for the sealing material became brittle, and cracks occurred in the coating film bending test. (Comparative Example 3) The ratio of the dimer acid-modified epoxy resin in the base resin is higher than the range specified in the present invention, and as a result, the elongation rate of the coating film of the surface treatment agent for the sealing material is in the range specified in the present invention. Because of the increase, the effect of preventing the transfer of the plasticizer from the surface treatment agent coating film of the sealing material was reduced, and the sealing material surface treatment agent coating film became tacky. (Comparative Example 4) Since the gel fraction of the coating film of the surface treatment agent for the sealing material is lower than the range specified in the present invention, the effect of preventing the coating film of the surface treatment agent for the sealing material from migrating with the plasticizer is reduced. The surface treatment agent coating film became tacky. (Comparative Example 5) Since the gel fraction of the sealant surface treatment agent coating film is higher than the range specified in the present invention, the sealant surface treatment agent coating film becomes brittle, and cracks occur in the coating film bending test. Was. In addition, in the heating and cooling repetition test, up to the hard acrylic emulsion paint of the finishing material,
This resulted in cracks.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a configuration of a base used in a hot / cold repetition test. FIG. 2 is a cross-sectional view showing a structure of a test body in a hot / cold repetition test. 1. 5 mm thick slate plate 2. 10 mm thick dry building materials Joint groove 4. 4. polyurethane-based sealing material 5. Sealant surface treatment agent Hard acrylic emulsion coating layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C09D 163/00

Claims (1)

(57) [Claims] [Claim 1] After casting a sealing material, the epoxy equivalent is 3
100 to 2000 dimer acid-modified epoxy resin
An epoxy resin base containing 90% by weight, a polyoxypropylenediamine having an active hydrogen equivalent of 100 to 200 ,
Lioxypropylene triamine, polyoxypropylene
It contains an aliphatic polyamine-based curing agent selected from tetraamines , contains no powder, and has a gel fraction of 30 to 8 of a cured product.
5%, a coating material having a coating film elongation of 100 to 500%, and a coating amount of the total solid content of the main agent and the curing agent.
A joint treatment coating method, which comprises applying a finish coating material after processing so as to be 30 to 200 g / m ^{2 in} terms of conversion .