JP2006104658A - Waterproof structure and primer material using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the compatibility of adhesion between a vinyl chloride sheet and a urethane coat by preventing the physical properties of the urethane coat formed on the vinyl chloride sheet from lowering due to the movement/vaporization of components from the vinyl chloride sheet. <P>SOLUTION: This waterproof structure comprises the vinyl chloride sheet adhered to a substrate surface to form a first resin layer as a waterproof layer, a second resin layer formed on the first resin layer, and a functional coat layer formed between the first and second resin layers. The functional coat layer comprises both a plasticizer vaporization prevention function having high crosslinking density and dense molecular structure and formed of a material having a large number of functional groups of prepolymer and an adhesiveness promoting function between the first and second resin layers. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a waterproof structure such as a building and a primer material used for the construction, and more specifically, a vinyl chloride resin-based waterproof sheet attached to a base surface, a resin layer formed on a part or all of this upper surface, and these And a primer material for forming the functional coating layer.

As a waterproof sheet for laying on a flat roof of a building, a balcony or the like to form a waterproof layer, a vinyl chloride sheet having many advantages such as good appearance and low cost is often used. Even if there are protrusions like a pedestal on the construction surface, the area around the pedestal is constructed with a vinyl chloride sheet. However, since it is difficult to properly apply a vinyl chloride sheet when the construction surface with many places and the surroundings of the base are complicated, it is often the case that a waterproof layer is formed with a resin material that is easy to construct, especially a urethane coating. .

Further, when the vinyl chloride sheet as the waterproof layer is deteriorated by exposure to ultraviolet rays or damaged due to other causes, it is necessary to repair the entire surface or a part thereof in order to maintain the waterproof reliability. In such a case, a method for forming a resin coating film excellent in workability, particularly a urethane coating film waterproofing method is often employed.

The technology related to the present invention is disclosed in the following document.
JP 2003-041717 A JP 2002-364128 A JP 2001-207598 A Japanese Patent Laid-Open No. 11-0256778 Japanese Patent Application Laid-Open No. 08-0260708

However, in the above-described conventional waterproof structure, the physical properties of the resin film of the compounding component may be reduced between the vinyl chloride sheet and the urethane coating layer due to the migration and volatilization of the compounding component between the vinyl chloride sheet and the urethane coating layer. In addition, inconveniences such as further adhesion failure between the vinyl chloride sheet and a resin film with poor adhesion compatibility, such as a urethane coating, are likely to occur, and there may be cases where waterproof reliability is impaired. is there.

The present invention includes a vinyl chloride sheet as a first resin layer that is bonded to a base surface to form a waterproof layer, a second resin layer that is formed on the vinyl chloride sheet, the first resin layer, and a second resin layer. A functional coating layer formed between the resin layer and the coating layer. The functional coating layer is formed of a material having a high cross-linking density and a dense molecular structure. It is intended to solve the above conventional problems by realizing a waterproof structure characterized by having both a function of preventing migration and volatilization and a function of improving mutual adhesion between the first and second resin layers. is there.

In the waterproof structure, the second resin layer may be formed of a urethane coating layer formed on a vinyl chloride sheet as a waterproof layer.

Furthermore, in any of the above waterproof structures, the functional coating layer may be composed of an acrylic urethane resin material.

Furthermore, in any one of the above waterproof structures, the acrylic urethane resin material comprises a two-component mixed acrylic urethane resin composition, and a polymerizable unsaturated monomer (A) having a hydroxyl group as a monomer component; The acrylic polyol resin composition containing the polymerizable unsaturated monomer (B) copolymerizable with the polymerizable unsaturated monomer (A) is used as one agent, and the polyisocyanate compound is used as the other agent. The hydroxyl group / isocyanate group equivalent ratio may be set to 0.5 to 2.0.

  Moreover, in said waterproof structure, the hydroxyl value in the acrylic polyol resin composition as one agent of the said 2 liquid acrylic urethane type-resin composition may be set to the range of 40-340 (mgKOH / g).

  The invention of the present application is also a primer material composed of an acrylic urethane-based resin material interposed between the vinyl chloride sheet and the resin coating layer when the urethane or other resin coating layer is formed on the vinyl chloride sheet, The acrylic urethane-based resin material is a two-component mixed acrylic urethane-based resin composition, and includes a polymerizable unsaturated monomer (A) having a hydroxyl group as a monomer component and the polymerizable unsaturated monomer (A). The acrylic polyol resin composition containing a copolymerizable polymerizable unsaturated monomer (B) is used as one agent, and the polyisocyanate compound is used as the other agent, and the hydroxyl group / isocyanate group equivalent ratio in both agents is 0.5-2. The above-mentioned conventional problems are to be solved by providing a primer material set to 0.0.

  The said primer material WHEREIN: The hydroxyl value in the acrylic polyol resin composition as one agent of the said 2 liquid acrylic urethane type-resin composition may be set to the range of 40-340 (mgKOH / g).

The invention of the present application is provided between a vinyl chloride sheet which is bonded to a base surface to form a first resin layer as a waterproof layer, and a second resin layer comprising a urethane coating layer and others formed on the first resin layer. In addition, a functional coating layer is formed as an intermediary primer that can enhance the compatibility between the two and prevent the migration and volatilization of the blended components, and this functional coating layer has a high crosslinking density such as acrylic urethane resin material. Since the structure is made of a material having a dense molecular structure, the adhesive strength between the first and second resin layers is improved, and the durability of the waterproof layer is enhanced by the action of preventing migration and volatilization of the blended components. A quality waterproof structure can be realized. In addition, when forming a urethane or other resin coating layer on a vinyl chloride sheet, a primer material made of an acrylic urethane resin material interposed between the vinyl chloride sheet and the resin coating layer is a hydroxyl group as a monomer component. One component is an acrylic polyol resin composition comprising a polymerizable unsaturated monomer (A) having a polymerizable monomer and a polymerizable unsaturated monomer (B) copolymerizable with the polymerizable unsaturated monomer (A), The polyisocyanate compound is composed of a two-component mixed acrylic urethane resin composition as the other agent, and the hydroxyl value is set in the range of 40 to 340 (mg KOH / g). Since the isocyanate group equivalent ratio is set to be 0.5 to 2.0, the adhesive strength between the vinyl chloride sheet and the resin layer formed thereon is improved. Durability of the vinyl chloride sheet and the second resin layer is enhanced by blending components proceeds, volatilization preventing action with, can achieve very high quality PVC sheet laminated structure.

PVC waterproof sheets are generally affected in various ways by external factors such as solar heat and ultraviolet rays. That is, deterioration phenomena such as deterioration and alteration of the situation of the vinyl chloride resin due to the dehydrochlorination reaction, curing due to volatilization of the blended plasticizer, and a decrease in performance as a sheet occur. Deterioration of the former resin material itself is a property that can occur generally in the resin material, but problems due to migration and volatilization of the latter plasticizer are peculiar to PVC waterproof sheets. Therefore, even when a further waterproof layer or a resin layer as a protective layer is formed on such a vinyl chloride waterproof sheet, it is necessary to take measures in consideration of the above characteristics of the vinyl chloride waterproof sheet.
Therefore, in the present invention, the cross-link density is high and dense between the first resin layer as a waterproof layer made of a vinyl chloride waterproof sheet and the urethane coating layer or the like as the second resin layer formed on the upper surface thereof. The structure which provides the functional coating film layer by the material which has molecular structure is employ | adopted. According to various experimental results, the functional coating layer is preferably formed by applying a primer with an acrylic urethane resin material in view of durability, freedom of structural design, cost, and the like.

The acrylic urethane-based resin material includes a polymerizable unsaturated monomer (A) having a hydroxyl group as a monomer component and a polymerizable unsaturated monomer copolymerizable with the polymerizable unsaturated monomer (A). The two-component mixed acrylic urethane resin composition according to (B) is further composed of an acrylic polyol resin composition having a hydroxyl value of 40 to 340 (mg KOH / g) and The polyisocyanate compound is included, and the hydroxyl group / isocyanate group equivalent ratio is set to 0.5 to 2.0, preferably 0.8 to 1.5.

  The polymerizable unsaturated monomer (A) having a hydroxyl group is not particularly limited, but a polymerizable unsaturated monomer having a primary hydroxyl group and a polymerizable unsaturated monomer having a secondary hydroxyl group may be used. preferable. These monomers may be used alone, but from the viewpoint of reactivity and stability with the polyisocyanate compound, they can be used in appropriate combinations, and many polymerizable unsaturated monomers having secondary hydroxyl groups are used. When used, the reactivity with the polyisocyanate compound can be reduced.

  Here, examples of the polymerizable unsaturated monomer having a primary hydroxyl group include 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, caprolactone-modified hydroxy (meth) acrylate, and N-methylolated acrylic. Examples include, but are not limited to, methylol group-containing compounds such as amide and hydroxyl group-containing vinyl monomers such as hydroxyethyl vinyl ether. These may be used alone or in combination of two or more.

  Examples of the polymerizable unsaturated monomer having a secondary hydroxyl group include 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-hydroxybutyl (meth) acrylate. It is not limited to these. These may be used alone or in combination of two or more.

  Since this monomer (A) is used for imparting a crosslinking point to the two-component acrylic urethane resin composition, in the present invention, the hydroxyl value in the acrylic polyol resin composition is 40 to 340 (mgKOH / It is necessary to set to g). By setting the hydroxyl value within such a range, the resin composition is sufficiently cured by crosslinking, and the function of preventing the migration of the blended components of the functional coating film can be exhibited.

  In addition, the lower limit of the hydroxyl group is preferably 40 (mgKOH / g), more preferably 50 (mgKOH / g) from the viewpoint of further improving component migration prevention. The upper limit of the hydroxyl value is preferably 340 (mg KOH / g), more preferably 100 (mg KOH / g), from the viewpoint of the balance between the performance in the previous period and other coating film properties.

Furthermore, the acrylic polyol resin composition contains a polymerizable unsaturated monomer (B) copolymerizable with the monomer (A) in addition to the monomer (A) described above. Examples of the polymerizable unsaturated monomer (B) include vinyl monomers and the like, but there is no particular limitation as long as it is a general radical copolymerizable monomer.
Specifically, aromatic vinyl monomers such as styrene, α-methylstyrene, p-tert-butylstyrene, vinyltoluene; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i -(Meth) acrylates such as propyl (meth) acrylate, n-butyl (meth) acrylate, lauryl (meth) acrylate, dibromopropyl (meth) acrylate, tribromophenyl (meth) acrylate or alkoxyalkyl (meth) acrylate; Diesters of unsaturated dicarboxylic acids such as maleic acid, fumaric acid or itaconic acid and monohydric alcohols; vinyl esters such as vinyl acetate and vinyl benzoate; perfluorocyclohexyl (meth) acrylate, di-perfluorosilane Vinyl esters containing (per) fluoroalkyl groups such as rohexyl fumarate or Ni-propyl perfluorooctanesulfonamidoethyl (meth) acrylate; vinyl ethers; (meth) acrylates; or unsaturated polycarboxylic Fluorine-containing compounds such as acid esters; or vinyl monomers having no functional group such as olefins such as (meth) acrylonitrile, vinyl chloride, vinylidene chloride, vinyl fluoride or vinylidene fluoride; vinyl ethoxysilane, γ- Silicon monomers such as methacryloxypropyltrimethoxysilane; 2- (meth) acryloyloxyethyl acid phosphate, dibutyl (2- (meth) acryloyloxydiethyl) phosphate, (meth) acrylamide, dimethyl Amide group-containing vinyl monomers such as (meth) acrylamide and Nt-butyl (meth) acrylamide, and dialkylaminoalkyl (meth) acrylates such as dimethylaminoethyl (meth) acrylate and diethylaminoethyl (meth) acrylate Can be mentioned.

Next, the two-component acrylic urethane-based resin composition contains the above-described acrylic polyol resin composition and a polyisocyanate compound. Here, the polyisocyanate compound used in the present invention is not particularly limited as long as it has two or more isocyanate groups, and a plurality of these may be used in combination. In addition, polyfunctional ones are improved in the function of transferring the composition component and preventing volatilization of the functional coating film.
For example, trimethylene diisocyanate, 1,6-hexamethylene diisocyanate, tolylene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymeric MDI, isophorone diisocyanate (IPDI), narbornane diisocyanate (NBDI), methyl-2,6-diisocyanate Examples include hexanoate, 2-isocyanatoethyl-2,6-diisocyanate caproate, and modified products thereof.

  In addition, the two-component acrylic urethane-based resin composition may be used in combination with a plasticizer, another resin, and a copolymer as appropriate for the purpose of improving the performance of the coating film.

The invention of the present application is particularly suitable for the overlap of the waterproofing layer with the polyvinyl chloride waterproof sheet, the partial repair or the overlapping part of the vinyl chloride waterproof sheet and the urethane coating layer around the mount, etc., but is not limited thereto. Of course, the present invention can also be applied to a novel composite waterproof structure comprising a vinyl chloride waterproof sheet and a urethane coating layer.

Next, the present invention will be further described with reference to examples. However, the present invention is not limited to the following examples. In addition, in the following Examples, the structure of the primer which forms a functional coating film is as follows.
Primer: An acrylic polyol resin composition having a hydroxyl value of 65 mgKOH / g and a material obtained by mixing and mixing so that the hydroxyl group / isocyanate group equivalent ratio is 1.0. Details of the components of the acrylic polyol resin composition are as follows.
Number of copies 2-HEMA 15.0
MMA 50.0
St 10.0
n-BA 25.0
Toluene 50.0
Butyl acetate 50.0
AIBN 1.0
Subtotal 200.1

FIG. 1 is a cross-sectional view according to the first embodiment of the waterproof structure according to the present invention, and shows an example of the entire surface of the vinyl chloride waterproof sheet 1 as the first resin layer which is a waterproof layer.
First, an acrylic urethane-based resin material as a primer is coated on an existing vinyl chloride waterproof sheet 1 to form a functional coating film surface 2 as a functional coating film layer, and then the functional coating film surface 2 A urethane coating layer 3 as a second resin layer is formed on the substrate by applying or spraying a urethane resin material. In the composite waterproof layer constructed in this way, the bonding between the vinyl chloride waterproof sheet 1 and the urethane coating layer 3 is good, the volatilization of the plasticizer from the vinyl chloride waterproof sheet 1 is prevented, and the vinyl chloride waterproof sheet 1 itself is cured. Deterioration phenomenon such as performance degradation as a sheet is suppressed, adverse effects on the urethane coating layer 3 are suppressed, and waterproof performance with high reliability can be obtained.

  FIG. 2 is a cross-sectional view according to the second embodiment, and is an example of partial repair of the vinyl chloride waterproof sheet 1 as the first resin layer as a waterproof layer, that is, the existing vinyl chloride waterproof sheet 1 is partially repaired. It is an example when it requires. An acrylic urethane-based resin material is applied as a primer to the repaired portion of the vinyl chloride waterproof sheet 1 to form a functional coating film surface 2 as a functional coating film layer, and then on the functional coating film surface 2 The urethane coating layer 3 as the second resin layer is formed by applying or spraying a urethane resin material. The operational effects are the same as in the first embodiment.

    FIG. 3 is a cross-sectional view according to the third embodiment, and is an example of the structure of the joint portion between the ends of the vinyl chloride waterproof sheet 1 and the urethane coating layer 3. A functional coating film surface 2 as a functional coating film layer is interposed between the both ends of the vinyl chloride waterproof sheet 1 and the urethane coating film layer 3 at the overlapping portions. For this reason, the joint strength of the vinyl chloride waterproof sheet 1 and the urethane coating layer 3 in the overlapping portion is improved, and high waterproof reliability can be realized.

FIG. 4 is a cross-sectional view according to the fourth embodiment, showing an example of work around the gantry. In the figure, 4 is a base on the base concrete 5, the surface of the base 4 is covered with the urethane coating layer 3, and the end of the urethane coating layer 3 is stuck on the base concrete 5. It overlaps on the edge part of the vinyl chloride waterproof sheet 1, and the functional coating-film surface 2 as a functional coating-film layer by application | coating of an acrylic urethane type resin material is interveningly formed between both ends. For this reason, the joint strength of the vinyl chloride waterproof sheet 1 and the urethane coating film layer 3 at the overlapping portion around the mount is improved, and high waterproof reliability can be realized.

Next, the adhesive strength in Examples 1, 2, and 3, that is, the results of the evaluation test of the adhesive strength between the vinyl chloride sheet 1, the functional coating surface (primer coating surface) 2, and the urethane coating layer 3 are described. To do. In the above examples, the thickness of the functional coating layer is 60 μm.
The specimen was subjected to a heat degradation treatment at 80 ° C., the test was performed at a 180 ° peeling test, the tensile speed was 200 mm / min, and the measurement temperature was 20 ° C. For comparison, an initial measurement was performed when a urethane coating film as a resin layer was formed directly on a vinyl chloride sheet without interposing a functional coating layer. As will be apparent from the following, when a functional coating film surface is formed, good adhesiveness is exhibited even after heat deterioration treatment.

a: Test condition Test method: 180 ° peeling test Tensile speed: 200 mm / min
Measurement temperature: 20 ° C
Specimen: With functional coating surface (80 ° C heat degradation treatment). . . B No functional coating surface. . . . . . . . . . . . . . . . . . . B Test results (unit: N / 25mm width)



Initial 80 degree Celsius thermal degradation
30 days 120 days test body a 186 216 226
(Fracture phenomenon: second resin layer (urethane coating surface) cohesive failure))

Specimen B14
(Destruction phenomenon: interface failure of the first resin layer (vinyl chloride sheet) and second resin layer (urethane coating surface))

From the evaluation test, it is possible to confirm the excellent effects of the functional coating layer according to the present invention and the primer material forming the functional coating layer.

It is sectional drawing which concerns on 1st Example. It is sectional drawing which concerns on 2nd Example. It is sectional drawing which concerns on 3rd Example. It is sectional drawing which concerns on 4th Example.

Explanation of symbols

1. . . 1. Vinyl chloride tarpaulin . . Functional coating surface as a functional coating layer
3. . . Urethane coating layer 3

Claims (7)

A vinyl chloride sheet that is bonded to the lower ground to form the first resin layer, a second resin layer that is bonded and formed on the vinyl chloride sheet, and the first resin layer and the second resin layer are interposed. The functional coating layer is formed with a functional coating layer which has a dense cross-link density and a dense molecular structure, and the component component transfer, mutual adhesion between the waterproof layer and the protective layer. A waterproof structure characterized by having a function to improve performance. 2. The waterproof structure according to claim 1, wherein the second resin layer is a urethane coating layer formed on a vinyl chloride sheet as the first resin layer. 3. The waterproof structure according to claim 1, wherein the functional coating layer is made of an acrylic urethane resin material. 4. The waterproof structure according to claim 1, wherein the acrylic urethane-based resin material is a two-component mixed acrylic urethane-based resin composition, and a polymerizable unsaturated monomer (A) having a hydroxyl group as a monomer component. And an acrylic polyol resin composition containing a polymerizable unsaturated monomer (B) copolymerizable with this polymerizable unsaturated monomer (A) as one agent and a polyisocyanate compound as the other agent, A waterproof structure in which the hydroxyl group / isocyanate group equivalent ratio is set to 0.5 to 2.0 in both agents. 5. The waterproof structure according to claim 4, wherein the hydroxyl value in the acrylic polyol resin composition as one agent of the two-component acrylic urethane resin composition is set in the range of 40 to 340 (mgKOH / g). Waterproof structure. A primer material comprising an acrylic urethane resin material interposed between a vinyl chloride sheet and a resin coating film layer when a urethane or other resin coating film layer is formed on the vinyl chloride sheet, the acrylic urethane resin material Consists of a two-component mixed acrylic urethane resin composition, a polymerizable unsaturated monomer (A) having a hydroxyl group as a monomer component, and a copolymerizable copolymer with this polymerizable unsaturated monomer (A) The acrylic polyol resin composition containing the polymerizable unsaturated monomer (B) is used as one agent and the polyisocyanate compound is used as the other agent, and the hydroxyl group / isocyanate group equivalent ratio is set to 0.5 to 2.0 in both agents. Primer material characterized by 7. The primer material according to claim 6, wherein the hydroxyl value in the acrylic polyol resin composition as one agent of the two-component acrylic urethane resin composition is set in the range of 40 to 340 (mgKOH / g). Primer material.

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