JP2011068765A - Aggregate-containing emulsion coating material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aggregate-containing emulsion coating material which reduces leakage with time of a water soluble component such as a surface active agent from a protective coating film after applying a polymer based waterproof sheet and has good coating operational/finishing properties and good coating film drying characteristics. <P>SOLUTION: The aggregate-containing emulsion coating material is used for protecting a polymer-based waterproof sheet and is of a system which does not require or reduces the addition of a dispersing agent (a surface active agent). This coating material has a coating film-forming resin (a binder), aggregate and an aqueous solvent as essential components. A nonslip amount of the aggregate is incorporated into the coating film-forming resin. Further, colored aggregate is incorporated as the aggregate and a glycol is incorporated into the aqueous solvent to be adjusted so as to enable uniform coating and to have a predetermined drying rate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an emulsion-containing emulsion paint used for protecting a polymer waterproof sheet.

  In recent years, soft polymer waterproof sheets (especially vulcanized rubber sheets) have attracted attention from the environmental viewpoints and flexibility (softness) of building exterior wall materials, especially the heat insulation and recyclability of roofing materials, It has come to be widely used as a roofing finishing material.

  Here, a vulcanized rubber sheet will be described as an example, but the same applies to other polymer waterproof sheets.

  Further, “parts” and “%” indicating the number of blended parts in the present specification and claims are both mass units.

  General-purpose vulcanized rubber sheet is soft, so it needs to protect the paint film for finishing. Furthermore, from the standpoint of preventing perforation due to bird damage such as crows, it was necessary to use a paint with aggregates (non-patented) Reference 1).

  As an aggregate-containing paint, for example, an emulsion paint using an aqueous solvent (for example, acrylic) is frequently used.

  In a general-purpose emulsion paint, when it is aggregated, it is necessary to add or increase the dispersant and antifoaming agent together with the thickener (including fibers) (Patent Document 1, Table 1, Patent Document 2). (See Table 2). The thickener is from the standpoint of preventing sedimentation of the aggregate, the dispersant is preventing aggregation of the aggregate, and the antifoaming agent is from the viewpoint of preventing the formation of nests and blisters in the coating film (binder).

  In addition, although the invention of patent document 1 is related with the emulsion coating material containing an aggregate which uses a colored aggregate, it presupposes applying to an emulsion sealer coating film. The aggregate content is 30 to 300 parts (80 parts in the examples) with respect to 100 parts of the coating film-forming resin (binder) (see paragraphs 0023 and 0034, Table 1).

  The invention described in Patent Document 2 also relates to an emulsion-containing emulsion paint using colored aggregates, but does not intend to actively protect the waterproof sheet material, but the aggregate component content for the lower layer and the upper layer It is premised on forming with two different paints. In paragraph 0031, 60 to 90% of the solid content of the paint is described in relation to 100 parts of the coating film forming resin (binder). About 450-540 parts.

  In addition, although it does not affect the patentability of this invention, patent document 3 etc. can be mentioned as prior art literature relevant to the protective coating material of a waterproof sheet.

"Monthly Waterproof Journal March issue" 2007, published by Shinkisha Co., Ltd., p29

JP 2002-273339 A JP 2001-293435 A JP 2002-106118 A

  And it turned out that a water-soluble component leaks from a protective coating film with time. The water-soluble component contains a large amount of environmental load such as a surfactant, and is desirably as small as possible.

  Furthermore, when coating the existing waterproof rubber sheet with the emulsion emulsion containing aggregate, it was found that when the emulsion emulsion containing aggregate is made surfactant-free, the painting work and finish are not good (particularly, Summer).

  In view of the above, the problem of the present invention is that there is little leakage of water-soluble components such as surfactants over time from the protective coating film after the construction of the polymer waterproof sheet, and the coating work / finishability is good. An object of the present invention is to provide an emulsion-containing emulsion paint having good coating film drying properties (short coating film drying time).

  In the process of earnest development, the present inventors have found that the following problems can be solved by adopting the following constitution, and have come up with an emulsion-containing emulsion paint having the following constitution.

If the present invention is expressed qualitatively as part of the invention-specific matters,
It is an emulsion-containing emulsion paint that is used to protect polymer waterproof sheets and is a system that does not require or reduce the addition of a dispersant (surfactant).
A film-forming resin (binder), aggregate, and aqueous solvent are essential ingredients.
The film-forming resin is blended in an amount capable of preventing the aggregate from slipping, and
The aggregate containing colored aggregate is used, and the aqueous solvent contains glycols (2 to 6 carbon atoms) so that it can be applied uniformly and has a predetermined drying speed. , Which is characterized by that.

On the other hand, if the present invention is quantitatively expressed as part of the invention-specific matters,
It is an emulsion-containing emulsion paint that is used to protect polymer waterproof sheets and is a system that does not require or reduce the addition of a dispersant (surfactant).
A film-forming resin (binder), aggregate, and aqueous solvent are essential ingredients.
The aggregate contains colored aggregate in an amount of 30% or more in the total amount of the aggregate, and the aggregate is blended in an amount of 100 to 1000 parts with respect to 100 parts of the coating film-forming resin.
The aqueous solvent contains 6 to 35% of glycols.

  The coating composition having the above-described composition, as shown in the examples described later, has good coating work and finish without adding a surfactant or an antifoaming agent, and also has good drying properties. is there. Therefore, the emulsion paint of the present invention can eliminate or minimize the leakage of water-soluble components such as surfactants over time from the protective coating film after the construction of the polymer waterproof sheet. Become.

It is model sectional drawing which shows the construction structure of the polymer-type waterproof sheet which formed the protective coating film with the emulsion coating material with an aggregate of this invention.

  Hereinafter, the emulsion-containing emulsion paint (A) of the present invention, and the protective film construction method and construction structure (B) of the polymer waterproof sheet to which the paint composition is applied will be described.

(A) Aggregate-containing emulsion paint It is assumed that the paint of the present invention is an aggregate-containing emulsion paint used for protecting a polymer waterproof sheet.

  Here, as the polymer waterproof sheet, those listed as “synthetic polymer roofing sheets” defined in JIS A 6008 (2002) can be used. Specifically, vulcanized rubbers such as ethylene propylene rubber, butyl rubber and chlorosulfonated polyethylene; thermoplastic elastomers such as polyolefins; vinyl chloride resins such as vinyl chloride resins and vinyl chloride copolymers; ethylene vinyl acetate Examples thereof include an ethylene vinyl acetate resin system such as a polymer.

  Of these, vulcanized rubbers having excellent heat insulation and durability, particularly ethylene propylene rubbers having excellent weather resistance are preferred.

  In addition, although the thickness of a waterproof sheet changes with materials, for example, in the case of a vulcanized rubber sheet, it is 0.5-5 mm normally, It is set as the range of 0.8-2 mm desirably. If it is thin, it will be difficult to secure the required heat insulation and durability. Conversely, if it is thick, it will result in excessive quality and an increase in the weight of the entire wall surface (such as the rooftop).

  The emulsion paint contains a coating film forming resin (binder), an aggregate, and an aqueous solvent as essential components. More desirably, it is desirable to add a reinforcing fiber and a thickener, and a pigment (inorganic / organic), further, a preservative, an ultraviolet absorber, a light stabilizer, and the like may be appropriately added.

  In addition, although synthetic fiber and natural fiber can be used as a reinforcing fiber, when using a cellulose type (CMC) as a thickener, it is desirable to use a cellulose type fiber from a dispersible viewpoint.

  1) The coating film forming resin is not particularly limited as long as it is used for building exteriors. Specific examples include acrylic resins, polyurethane resins, vinyl resins, chlorinated polyolefin resins, acrylic silicone resins, polybutadiene resins, and fluorine resins. Of these, acrylic silicone resins, acrylic resins, polyurethane resins and the like can be suitably used from the viewpoint of weather resistance.

  Among these coating film forming resins, the glass transition point (Tg) is desirably selected from the range of -20 to 60 ° C, and more preferably 0 to 40 ° C. If the Tg is low, the cohesive energy is low, and it is difficult to ensure the bonding strength (rigidity) of the coating film (binder) to the required aggregate. If the Tg is too high, the bone of the coating film (binder). The bond strength (rigidity) to the material or the like is increased, the flexibility required for the coating film cannot be ensured, and the followability to the waterproof sheet is difficult to ensure.

  2) As the aggregate, one containing a colored aggregate is used.

  The particle size of the aggregate is not particularly limited as long as it can provide an anti-slip action on the surface, and usually has a particle size of 35 to 2500 μm, preferably 50 to 2000 μm, more preferably 100 to 1500 μm when classified by sieving. Is used. In addition, it is desirable to use those having different average particle size distributions because it is easy to secure the coating strength. When the particle size is small (for example, 100 μm or less when the average coating thickness is 1000 μm), it is difficult to obtain an anti-slip action on the coating surface, and the particle size is large (for example, when the average coating thickness is 1000 μm, it is 1000 μm or more). In addition, it is difficult for a binder to intervene between the aggregate and the waterproof sheet, and the aggregate is easily detached.

  Here, the colored aggregate is one in which a colored pigment is baked on the surface of ceramic or natural stone (such as silica sand), or one in which the colored pigment is fixed to the surface of mica, ceramics, or natural stone using an epoxy resin or the like as a binder. Say. In particular, a colored aggregate obtained by baking an inorganic coloring pigment on the surface of ceramics or natural stone is preferable because it is excellent in weather resistance and hardly causes fading (see Patent Document 1, paragraph 0022).

  The reason why the colored aggregate is contained is that it is easy to disperse in the emulsion paint, and as a result, the dispersant (surfactant) can be unnecessary or saved. The reason for improving the dispersibility of the aggregate is that the fine pores on the surface of the aggregate are sealed with a colored coating film, the surface area of the aggregate is reduced, and the aggregate and vehicle (aqueous solvent, coating film forming resin and water) This is presumed to be due to an increase in affinity.

  The content of the colored aggregate with respect to the total amount of aggregate is preferably 30% or more, more preferably 60% or more, and even more preferably 70% or more.

  As aggregates other than colored aggregates, silica sand, cold water sand, selben and the like can be suitably used because of their availability.

  The blending amount of the aggregate (total amount) is preferably 100 to 1000 parts, more preferably 200 to 600 parts, and even more preferably 300 to 500 parts with respect to 100 parts of the coating film forming resin.

  3) Here, when the raw material resin (coating film-forming resin) is an emulsion, the aqueous solvent includes an aqueous dispersion medium component, water, and an appropriate film-forming auxiliary, and glycols (2 carbon atoms). To 6: the same shall apply hereinafter).

  The term “water-based solvent” is “Chemical Handbook Application Edition 3rd revised edition” edited by the Chemical Society of Japan (Sho 55-3-15) Maruzen, p1135. It is synonymous with "coating film formation aid element" defined as "used to adjust the fluid properties of paint when spreading paint."

  The amount of film-forming aid added varies slightly depending on the type of film-forming resin and the type of film-forming aid, but is 5 to 20 parts, preferably 10 to 15 parts per 100 parts of resin. The amount is such that

  As a film-forming aid, when the film-forming resin is acrylic, a glycol derivative having a boiling point of 200 to 300 ° C. (preferably 230 to 280 ° C.), such as texanol (2,2,4-trimethyl-1, 3-pentanediol monoisobutyrate) can be preferably used.

  Examples of the glycols include those having 2 to 6 carbon atoms and a boiling point of 180 to 210 ° C. For example, ethylene glycol (EG) (BP: 190-205 ° C), propylene glycol (PG) (BP: 185-194 ° C), hexylene glycol (BP: 195-197 ° C), α-butylene glycol (BP: 192-194 ° C.) and the like.

  Among these, it is desirable to use PG as a base from the viewpoint of coating film drying property (volatile), and EG is desirable as a glycol to be combined with PG. More specifically, PG / EG = 10 / 0.2 to 10/5, preferably 10 / 0.5 to 10/2.

  And the content rate in the aqueous solvent of glycols is the range of 6-35% (preferably 8-34%) according to the request | requirement of application | coating work, finishing property, and drying property in the said aqueous solvent total amount. Set from. Moreover, from the balance of coating work / finishing property and drying property, for example, it is set within a range of 12 to 26% (preferably 14 to 24%).

  If glycols are not added or added in a small amount, it is difficult to form a uniform coating film, and the coating work / finishing performance decreases. This is because it is difficult to ensure the dispersibility of the aggregate and the antifoaming property during coating without using a dispersant (mainly a surfactant) and an antifoaming agent (polysiloxane).

  On the contrary, when the addition amount of glycols becomes excessive, the volatility of the aqueous solvent is suppressed, and the drying and curing time of the coating film becomes longer (the drying property decreases). (See Tables 1 and 2).

(B) Protective coating method and construction structure of polymer waterproof sheet The protective coating of the polymer waterproof sheet is performed as follows.

  After applying a polymer waterproof sheet (vulcanized rubber waterproof sheet) or applying an appropriate primer to the surface of an existing polymer waterproof sheet, an emulsion-containing emulsion paint having the above composition is applied. As the application tool, a general-purpose roller (for example, a porous roller or a wool roller), a brush, various spray guns, or the like can be used.

  The number of times of application is usually 1 to 2 times, but may be appropriately 3 times or more.

  At this time, the thickness of the dry coating film varies depending on the performance required for the protective coating film (thermal insulation, durability, etc.), but is usually selected appropriately from the range of 0.5 to 5 mm, preferably 0.8 to 3 mm.

  Thus, as shown in FIG. 1, a polymer waterproof sheet provided with a protective coating film 15 (aggregate 15 a / coating film forming resin 15 b) having a non-slip action on the waterproof sheet 13 constructed on the roof concrete wall 11. The construction structure can be obtained.

  Examples carried out together with comparative examples in order to confirm the effect of the emulsion-containing emulsion paint of the present invention will be described below.

<Combination prescription>
The emulsion paints of each of the examples and comparative examples were prepared as shown in Tables 1 and 2 and allowed to stand for 24 hours after sufficiently stirring using a dissolver mixer. Further, the colored aggregate used was a dip-coated acrylic emulsion paint containing colored pigment on the surface of silica sand (No. 8).

  The particle size distribution of silica sand (No. 8) is 250 μm or less: 69%, 100 μm or less: 26%, 45 μm or less: 5%.

<Test method>
During a sunny day in early summer (temperature: 28 ° C, RH: 40%), a black vulcanized rubber waterproof sheet (EPDM type, 1000mm □ × 1.2mmt) in the sun, the number corresponding to the examples and comparative examples, Installed horizontally.

    And 1) painting work / finish, 2) drying property was evaluated according to the following criteria.

1) Painting work / finishing performance When the waterproof sheet reaches 62-63 ° C, the paint of each example and comparison is applied using a mastic roller (porous roller) (application amount: about 0.35 kg / m ² ) The situation after the evaluation was evaluated according to the following criteria.

      ○: A coating film having a uniform finish can be easily obtained without any difficulty in painting workability. Here, the term “homogeneous” means that the degree of unevenness is within ± 30% of the average thickness.

      [Delta]: A coating film having a uniform finish can be obtained as in the case of [circle], but the coating needs to be more careful.

      X: Aggregate slippage occurs during painting, and the coating film does not have a uniform finish throughout.

2) Drying time The waterproof sheet after the coating was moved indoors (room temperature: 23 ° C., RH: 60%), and the state of drying of the coating film after being allowed to stand for 10 hours was evaluated based on the following criteria.

      ○: Even when walking on the waterproof sheet with rubber shoe soles (hereinafter the same), it is dry to the extent that no footprints remain.

      Δ: Dry enough to walk on the waterproof sheet, but the footprints remain slightly.

      X: When walking on the waterproof sheet, the paint adheres to the shoe sole (undried).

<Test results>
The test results are shown in Tables 1 and 2.

  From the test results, it can be seen that it is difficult to obtain a uniform coating finish in Comparative Examples 4 and 5 in which glycols are not added or are insufficient. Moreover, it turns out that the comparative examples 1-3 with excessive glycols have a very slow drying rate.

  Further, when the content of glycols is small from Example 1, the coating workability is slightly lowered, and from Example 6, when the content of glycols is large, the drying rate tends to be slow (the drying property is also lowered). I understand that.

11 Roof Concrete Wall 13 Waterproof Sheet 15 Protective Coating

Claims (7)

It is an emulsion-containing emulsion paint that is used to protect polymer waterproof sheets and is a system that does not require or reduce the addition of a dispersant (surfactant).
A film-forming resin (binder), aggregate, and aqueous solvent are essential ingredients.
The film-forming resin is blended in an amount capable of preventing the aggregate from slipping, and
The aggregate containing colored aggregate is used as the aggregate, and the aqueous solvent contains glycols (2 to 6 carbon atoms: the same shall apply hereinafter) so that it can be uniformly applied and has a predetermined drying speed. Adjusted,
An emulsion-containing emulsion paint. It is an emulsion-containing emulsion paint that is used to protect polymer waterproof sheets and is a system that does not require or reduce the addition of a dispersant (surfactant).
A film-forming resin (binder), aggregate, and aqueous solvent are essential ingredients.
The aggregate contains 100 to 1000 parts by mass with respect to 100 parts by mass of the coating film-forming resin, and contains 30% by mass or more of the colored aggregate in the total amount of the aggregate.
The aqueous solvent contains 6 to 35% by mass of glycols.
An emulsion-containing emulsion paint. The aggregate is a colored aggregate containing 70% by mass or more in the total amount of aggregate, and is blended in an amount of 300 to 600 parts by mass with respect to 100 parts by mass of the coating film-forming resin,
The aggregate-containing emulsion paint according to claim 2, wherein the aqueous solvent contains 12 to 26% by mass of glycols.   The coating film forming resin is acrylic, and the glycol is a combined system with ethylene glycol (EG) containing 50% by mass or more of propylene glycol (PG). 3. The emulsion-containing emulsion paint according to 3.   A polymer comprising a protective coating layer formed of the emulsion-containing emulsion paint according to any one of claims 1 to 4 on a surface side of a polymer-based waterproof sheet applied to an exterior building wall surface. Construction structure of water-based waterproof sheet.   6. The construction structure of a polymer waterproof sheet according to claim 5, wherein the polymer waterproof sheet is a vulcanized rubber sheet.   Applying the emulsion-containing emulsion paint according to any one of claims 1 to 4 after applying a primer, if necessary, on the surface of an existing polymer waterproof sheet after construction of a polymer waterproof sheet. Protective coating method for polymer waterproof sheet.

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