Roller coating improver for water-based emulsion paint and water-based emulsion paint containing same

Abstract

To provide a roller coating properties improver having excellent roller coating properties.SOLUTION: A roller coating properties improver for aqueous emulsion coating material contains polyoxyalkylene compound (X) expressed by formula (1). R-N{-(AO)n-H}2 (1) in which R denotes an alkyl group or an alkenyl group of carbon number 8 to 22, N denotes a nitrogen atom, H denotes a hydrogen atom, AO denotes an oxyalkylene group of carbon number 2 to 4, and n denotes an integer of 2 to 20. An aqueous emulsion coating material contains water, emulsion resin and the above-described roller coating properties improver, and the content of the roller coating properties improver is 0.5 to 5 wt.% on the basis of the weight of water, emulsion resin and roller coating properties improver.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to an agent for improving roller coatability for aqueous emulsion paints and to aqueous emulsion paints containing the same. [Background technology]

[0002] A viscosity modifier represented by the following general formula (1) is used as an agent for improving the roller coating properties of water-based emulsion paints. [ka] (In the formula, R 1 ~R 4 Each represents a linear alkyl group having 1 to 13 carbon atoms, and R 5 and R 6 represents any group represented by the following formula (2) or (3), m and n each represent a number from 3 to 15, x represents a number from 40 to 800, and y represents a number of 1 or more. 1 and R 2 The sum of the carbon numbers of R 3 and R 4 The sum of the carbon numbers must be 10 to 14.) [ka] [ka] " is known (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-122011 A Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional viscosity modifiers have a problem of poor roller applicability of aqueous emulsion paints. That is, when applying a conventional viscosity modifier to an aqueous emulsion paint for roller application, if the viscosity modifier is added to the paint to increase its viscosity in order to prevent the paint from scattering, the paint becomes difficult to spread on the paint, while if the viscosity modifier is reduced or a dilution solvent is added to reduce the viscosity of the paint, the amount of the paint impregnated into the roller is small and the paint scatters. An object of the present invention is to provide a roller coatability improver which is excellent in roller coatability. [Means for solving the problem]

[0005] The roller coatability improver for aqueous emulsion paint of the present invention is characterized in that it contains a polyoxyalkylene compound (X) represented by formula (1).

[0006] RN{-(AO) n --H}2(1)

[0007] R represents an alkyl or alkenyl group having 8 to 22 carbon atoms, N represents a nitrogen atom, H represents a hydrogen atom, AO represents an oxyalkylene group having 2 to 4 carbon atoms, and n represents an integer of 2 to 20.

[0008] The water-based emulsion paint of the present invention is characterized in that it is a water-based emulsion paint comprising water, an emulsion resin, and the above-mentioned roller coatability improver, The gist of the invention is that the content of the roller coatability improver is 0.5 to 5% by weight based on the weight of the water, the emulsion resin, and the roller coatability improver. Effect of the Invention

[0009] The roller coatability improver for aqueous emulsion paint of the present invention exhibits excellent suitability for roller coating. Therefore, an aqueous emulsion paint exhibiting excellent suitability for roller coating can be easily prepared. That is, when the roller coatability improver for aqueous emulsion paint of the present invention is applied to an aqueous emulsion paint and roller coating is performed, the paint has excellent anti-scattering properties, paint spreadability, and roller impregnation properties.

[0010] Since the aqueous emulsion paint of the present invention contains the above-mentioned roller coatability improver, it exhibits excellent roller coatability, and when this aqueous emulsion paint is roller coated, it is excellent in terms of paint scattering prevention, paint spreading property and roller impregnation. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a photograph showing the condition of the coated surface immediately after evaluating 3. Paint spreadability, (1) the amount of transfer to the slate board, and the presence or absence of smearing for the emulsion paint (1) for evaluation prepared using the roller coatability improver for aqueous emulsion paint (1) of Example 1. [Diagram 2] The emulsion paint (H1) for evaluation was prepared using the comparative viscosity modifier (H1) of Comparative Example 1. (3) Photographs were taken of the condition of the painted surface immediately after evaluating the paint spreadability, (1) the amount of transfer to the slate board, and the presence or absence of smearing. [Diagram 3] In the Examples section, the photographs show the condition of the painted surface immediately after evaluating the emulsion paint (blank) for evaluation in terms of 3. Paint spreadability, (1) the amount of paint transferred to the slate board, and the presence or absence of smudges. [Figure 4] FIG. 1 is a schematic diagram showing the locations (marked with circles) where film thickness was measured to calculate the average and standard deviation values ​​of film thickness in the section on Examples (3. Paint spreadability). (The numbers indicate the distance between each circle (unit: cm).) DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] <Polyoxyalkylene compound (X)> Examples of the alkyl or alkenyl group (R) having 8 to 22 carbon atoms (preferably 10 to 20, and more preferably 12 to 18) include n-octyl, 2-ethylhexyl, n-nonyl, n-decyl, isodecyl, n-undecyl, n-dodecyl, n-tridecyl, isotridecyl, n-tetradecyl, n-pentadecyl, n-hexadecyl, n-heptadecyl, n-octadecyl, isooctadecyl, n-docosyl, n-decenyl, 2-dodecenyl, isotridecenyl, and n-octadecenyl.

[0013] The oxyalkylene group (AO) having 2 to 4 carbon atoms includes oxyethylene, oxypropylene, and oxybutylene. (AO) n When the oxyalkylene group contains a plurality of types of oxyalkylene groups, the bonding pattern may be any of block, random, and a mixture thereof.

[0014] The polyoxyalkylene compound (X) represented by formula (1) includes polyoxyalkylene compounds having a structure produced by a chemical reaction between an alkylamine (a1) or alkenylamine (a2) having 8 to 22 carbon atoms and ethylene oxide, propylene oxide and / or butylene oxide (a3) ​​{the amount of (a3) ​​is preferably 4 to 40 moles per mole of (a1) or (a2).}.

[0015] Examples of the alkylamine (a1) or alkenylamine (a2) having 8 to 22 carbon atoms include n-octylamine, 2-ethylhexylamine, n-nonylamine, n-decylamine, isodecylamine, n-undecylamine, n-dodecylamine, n-tridecylamine, isotridecylamine, n-tetradecylamine, n-pentadecylamine, n-hexadecylamine, n-heptadecylamine, n-octadecylamine, isooctadecylamine, n-docosylamine, n-decenylamine, 2-dodecenylamine, isotridecenylamine, and n-octadecenylamine.

[0016] <Polyoxyalkylene compound Y> The roller coatability improver for aqueous emulsion paint of the present invention preferably contains a polyoxyalkylene compound (Y) represented by formula (2).

[0017] Q{-(AO) m -H} t (2)

[0018] In the formula, Q represents a residue obtained by removing hydrogen atoms from t primary hydroxyl groups of a non-reducing di- or trisaccharide, AO represents an oxyalkylene group having 2 to 4 carbon atoms, m represents an integer of 5 to 30, t represents an integer of 2 to 4, and H represents a hydrogen atom. The total number of AO is 20 to 80 per residue (Q), and the number of (AO) m may be the same or different.

[0019] Examples of non-reducing di- or trisaccharides capable of constituting the residue (Q) obtained by removing hydrogen atoms from t primary hydroxyl groups of a non-reducing di- or trisaccharide include sucrose (saccharose), trehalose, isotrehalose, isosaccharose, gentianose, raffinose, melezitose, planteose, etc. Among these, from the viewpoint of roller coating properties, sucrose, trehalose, gentianose, raffinose, and planteose are preferred, more preferably sucrose, trehalose, and raffinose, and from the viewpoints of supplyability, cost, etc., sucrose is particularly preferred.

[0020] Examples of the oxyalkylene group (AO) having 2 to 4 carbon atoms include oxyethylene, oxypropylene, oxybutylene, etc. Among these, from the viewpoint of roller coating properties, when the total number of oxyalkylene groups (AO) per residue (Q) is 25 to 59, oxypropylene alone is preferred, when the total number is 15 to 24, a mixture of oxybutylene and oxypropylene is preferred, and when the total number is 60 to 80, a mixture of oxyethylene and oxypropylene is preferred.

[0021] When a mixture of oxypropylene and / or oxybutylene and oxyethylene is contained, the content ratio (mol%) of oxyethylene is preferably 2 to 10, more preferably 2 to 8, and particularly preferably 4 to 6, based on the total number of moles of oxyalkylene groups. In this case, it is preferable that oxypropylene and / or oxybutylene are located at an end far from the reaction residue (Q). That is, in this case, it is preferable that the oxyethylene group is directly bonded to the reaction residue (Q). In addition, when a plurality of types of oxyalkylene groups (AO) are contained, the bonding form may be any of block, random, and a mixture thereof, but it is preferable that at least the bonding form is included.

[0022] m is preferably an integer of 5 to 30, more preferably an integer of 7 to 28, and particularly preferably an integer of 10 to 25. If it is within this range, the roller coating property will be further improved.

[0023] t is preferably an integer of 2 to 4, and more preferably 3. Within this range, roller coating properties will be even better.

[0024] When the polyoxyalkylene compound (Y) is contained, the content weight ratio of the polyoxyalkylene compound (X) to the polyoxyalkylene compound (Y) {(X):(Y)} is preferably 50-95:50-5, and more preferably 55-90:45-10, from the viewpoint of roller coating properties.

[0025] The roller coatability improver for aqueous emulsion paints of the present invention may contain known additives (antifoaming agents, wetting agents, etc.) if necessary.

[0026] Examples of the defoaming agent include SN DEFOAMER 180 and 184 (manufactured by SAN NOPCO LTD.), and examples of the wetting agent include SN WET 125 and 126 (manufactured by SAN NOPCO LTD.). When known additives are contained, the content of these is preferably about 0.01 to 10% by weight based on the weight of the polyoxyalkylene compound (X).

[0027] The method for producing the roller coatability improver for aqueous emulsion paint of the present invention is not particularly limited, and a known method can be applied. A polyoxyalkylene compound (X) can be prepared by a known alkylene oxide addition reaction, etc., and when a polyoxyalkylene compound (Y) is contained, a polyoxyalkylene compound (Y) can be prepared by a known alkylene oxide addition reaction, etc., and the polyoxyalkylene compound (X) and the polyoxyalkylene compound (Y) can be uniformly mixed to obtain the product. There is no limit to the uniform mixing temperature, but from the viewpoint of mixing efficiency, it is preferably about 10 to 70°C.

[0028] The roller coatability improver for water-based emulsion paint of the present invention is particularly suitable for water-based emulsion paints, but can also be widely applied to paints containing water.

[0029] <Water-based emulsion paint> The aqueous emulsion paint of the present invention contains water, an emulsion resin, and the above-mentioned roller coatability improver for aqueous emulsion paints, and may optionally contain a pigment, a dispersant, a wetting agent, a viscoelasticity modifier, an antifoaming agent, a preservative, and / or a film-forming aid.

[0030] The amount (wt %) of the roller coatability improver for aqueous emulsion paint used, based on the weight of water, emulsion resin, and roller coatability improver for aqueous emulsion paint, is preferably 0.5 to 5, and more preferably 1 to 4. Within this range, the roller coatability becomes even better.

[0031] The water-based emulsion paint of the present invention can be obtained by a known method, and the roller coatability improver for water-based emulsion paint can be mixed in any step, but is preferably mixed in the dissolution step (let-down step).

[0032] The aqueous emulsion paint of the present invention can be used for various purposes, including architectural paints, paints for structures such as tanks and bridges, coating liquids for coated paper, paints for electronic materials such as electromagnetic and optical components, paints for structural materials using ceramics, and coating compositions such as functional slurry paints to be applied to various molded bodies. EXAMPLES

[0033] <Examples 1 to 7> As the polyoxyalkylene compound (X) represented by formula (1), n-octadecylamine·ethylene oxide 20 mol adduct (X1), isodecylamine·ethylene oxide 7 mol adduct (X2), n-decenylamine·ethylene oxide 4 mol adduct (X3) and 2-dodecenylamine·ethylene oxide 40 mol adduct (X4) were used. As the polyoxyalkylene compound (Y) represented by formula (2), sucrose·ethylene oxide 3 mol·propylene oxide adduct (X4) was used. The roller coatability improvers (1) to (7) for aqueous emulsion paints of Examples 1 to 7 were prepared by uniformly mixing the amounts (parts by weight) shown in Table 1 of each of the following: trehalose·propylene oxide 72-mol block adduct (Y1), trehalose·propylene oxide 12-mol random adduct (Y2), sucrose·ethylene oxide 4-mol block adduct (Y3), and sucrose·propylene oxide 59-mol adduct (Y4).

[0034] [Table 1]

[0035] <Comparative Example 1> The product 3 of the present invention described in the column of Examples of Patent Document 1 was prepared in accordance with the description in the column of Examples from 800g (0.1 mol) of polyoxyethylene glycol having a weight average molecular weight of 8000, 40.2g (0.2 mol) of secondary alcohol 12EO having 12 to 14 carbon atoms {obtained by adding 9 mol of ethylene oxide to 1 mol of alcohol 1 (secondary alcohol 3EO having 12 to 14 carbon atoms (SOFTANOL M30, Nippon Shokubai Co., Ltd., "SOFTANOL" is a registered trademark of the company)} (alcohol 3), and 34g (0.2 mol) of hexamethylene diisocyanate, and this was used as a comparative viscosity modifier (H1).

[0036] <Evaluation 1> 1. Preparation of emulsion paint for evaluation The raw material composition shown in Table 2 was ground with a tabletop sand mill equipped with a disk-type blade (Kanpe Home Paint Co., Ltd., Kanpe Sand Mill), and then let down with a mixer equipped with an anchor-type blade (Tokyo Rikakikai Co., Ltd., MAZELLA ZZ-1100, "MAZELLA" is a registered trademark of the company) to prepare an emulsion-based paint. 98 parts by weight of this emulsion-based paint and 2 parts by weight of any of the roller coating improvers (1) to (7) obtained in the examples or any of the viscosity adjusters (H1) for comparison were mixed and stirred at 25°C, 2000 rpm for 5 minutes in an Excel Auto Homogenizer (Nippon Seiki Co., Ltd., Model ED) equipped with a Coles-type blade to obtain emulsion paints (1) to (7) and (H1) for evaluation. 98 parts by weight of the emulsion-based paint and 2 parts by weight of water were mixed and stirred in the same manner as above to obtain an emulsion paint (blank) for evaluation.

[0037] [Table 2]

[0038] *1 Dispersant: San Nopco Limited, and "Nopcol" is a registered trademark of the company. *2 Thickener, Daicel FineChem Ltd. *3 Wetting agent, San Nopco Ltd. *4 Wetting agent, San Nopco Ltd. *5 Barium sulfate, Sakai Chemical Industry Co., Ltd., and "Variace" are registered trademarks of the company. *6 Titanium dioxide, Ishihara Sangyo Kaisha, Ltd., and “Tipaque” are registered trademarks of the company. *7 Acrylic emulsion, DIC Corporation; "Boncoat" is a registered trademark of the company. *8 Film forming regulator, JNC Corporation

[0039] 2.Roller impregnation 100g of each emulsion paint for evaluation was placed in a 140ml glass bottle, sealed, and left at 25℃ for 18 hours, after which 80g of the emulsion paint for evaluation was transferred to a roller tray (240mm wide x 76mm deep x 385mm high, product name: 4-inch roller tray, Otsuka Brush Manufacturing Co., Ltd.) in a room temperature-controlled at 25℃, and the paint was impregnated by rolling it back and forth 10 times with a weighed 4-inch small roller (13mm bristle length, product name: Maron for interior and exterior use, Otsuka Brush Manufacturing Co., Ltd.). The weight of the 4-inch small roller was then measured, and the amount of paint impregnated (g) was calculated from the weight before and after impregnation, as shown in the table below. The greater the amount of impregnation, the better the roller impregnation.

[0040] 3.Paint spreadability (1) Amount of transfer onto the slate board and presence or absence of smudges 100g of each emulsion paint for evaluation was placed into a 140ml glass bottle, which was then sealed and left to stand at 25°C for 18 hours, and then in a room with the temperature regulated at 25°C, a 20cm x 13.5cm slate board that had been surface treated with a sealer (product name: water-based silicone undercoat sealer, Nippe Home Products Co., Ltd.) was covered with masking tape outside the painted area, and the slate board was then held against a vertical wall with the short sides facing up and down and the long sides facing left and right. Next, 80 g of the emulsion paint for evaluation was transferred to a roller tray (width 240 mm x depth 76 mm x height 385 mm, product name: Roller tray 4 inches, Otsuka Brush Manufacturing Co., Ltd.), and the paint was impregnated with 10 strokes using a weighed 4-inch small roller (hair length 13 mm, product name: Maron for interior and exterior use, Otsuka Brush Manufacturing Co., Ltd.). The roller was then moved back and forth or squeezed so that the amount of paint impregnated was 40 g, and the paint was applied to a slate board held against a vertical wall by three strokes. The weight of the small roller immediately after painting was measured, and the amount of paint transferred (g) to the slate board out of 40 g of paint was calculated. Furthermore, the masking tape was peeled off from the slate board, and the presence or absence of smearing on the painted surface was visually confirmed, and these are shown in the table below. The greater the "amount of transfer (g) to the slate board," the better the paint spreadability, and the absence of "smearing" indicates good paint spreadability.

[0041] (2) Average and standard deviation of film thickness Except for changing the "20cm x 13.5cm slate board surface-treated with a sealer (product name: water-based silicone undercoat sealer, Nippe Home Products Co., Ltd.)" to "a tin plate (30cm x 20cm x 0.3mm thick, JIS G3303, TP Giken Co., Ltd.) divided into two pieces (15cm x 10cm)," the same procedure as in "(1) Amount of transfer to slate board and presence or absence of smearing" was used. The tin plate was painted, the masking tape was removed from the tin plate, and the plate was dried at 25°C for 24 hours. After that, the thickness was measured using an electromagnetic coating thickness meter (DELTASCOPE FMP-10, Fischer Instruments Co., Ltd., "DELTASCOPE" is a registered trademark of Helmut Fischer GmbH Institut fur Elektronik und Messtechnik) according to JIS K 5600-1-7:2014, 5.5.6 Measurement method 7C. Using a magnetic induction coating thickness meter, the coating thickness (μm) was measured at a total of 10 points, indicated by circles in Figure 4, and the arithmetic mean (μm) and standard deviation were calculated, which are shown in the table below. If the "average coating thickness" is 22μm or more, the paint spreadability is good, and the smaller the "standard deviation value," the better the paint spreadability.

[0042] 4. Paint scattering prevention After leaving each emulsion paint for evaluation at 25°C for 18 hours, in a room adjusted to 25°C, the entire cup of a Zahn cup (No. 3, orifice diameter: 3.85 mm, volume: 44 mL, All Good Co., Ltd., ASTM D4212-16) was immersed in each emulsion paint for evaluation, and then the Zahn cup was lifted and the emulsion paint for evaluation was dropped from the orifice to measure the time (seconds: viscosity) until the entire amount had finished dropping, and the number of times that the emulsion paint for evaluation dropped was measured within 15 seconds from the time when the drop was completed. This operation was repeated five times, and the average value of the five times was calculated. The average number of times that the paint dropped (times) was taken as the anti-scattering property and is shown in the table below. The fewer the number of times, the better the spinnability and the less likely the paint was to scatter.

[0043] [Table 3]

[0044] As described above, the aqueous emulsion paint using the roller coatability improver of the present invention was superior in terms of paint splash prevention, paint spreadability, and roller impregnation, compared to the aqueous emulsion paint using the comparative viscosity adjuster and the blank.

[0045] As shown in Figures 1 to 3, the surface painted with the water-based emulsion paint using the comparative viscosity modifier (Figure 2) showed "fading," and this "fading" also affected the standard deviation of the film thickness. Also, the surface painted with the evaluation water-based emulsion paint (blank) (Figure 3) showed no "fading," but in addition to the absence of roller marks (roller painting traces), the paint film thickness was thin near the top edge and thick near the bottom edge, and sagging was observed near the bottom edge (near where the masking tape was peeled off), and this difference in paint thickness also affected the standard deviation of the film thickness.

Claims

1. A roller coatability improver for aqueous emulsion paints, comprising a polyoxyalkylene compound (X) represented by formula (1): R-N{-(AO) ｎ ―H} ２ (1) R represents an alkyl or alkenyl group having 8 to 22 carbon atoms, N represents a nitrogen atom, H represents a hydrogen atom, AO represents an oxyalkylene group having 2 to 4 carbon atoms, and n represents an integer of 2 to 20.

2. The roller coatability improver according to claim 1 , further comprising a polyoxyalkylene compound (Y) represented by formula (2): Q{-(AO) ｍ -H} ｔ (2) In the formula, Q represents a residue obtained by removing hydrogen atoms from t primary hydroxyl groups of a non-reducing di- or trisaccharide, AO represents an oxyalkylene group having 2 to 4 carbon atoms, m represents an integer of 5 to 30, t represents an integer of 2 to 4, and H represents a hydrogen atom. The total number of AO is 20 to 80 per residue (Q), and t (AO) ｍ may be the same or different.

3. 3. The roller coatability improver according to claim 2, wherein the reaction residue (Q) of the non-reducing di- or trisaccharide is a reaction residue of sucrose.

4. 3. The roller coatability improver according to claim 2, wherein the weight ratio of the polyoxyalkylene compound (X) to the polyoxyalkylene compound (Y) {(X):(Y)} is 50-95:50-5.

5. An aqueous emulsion paint comprising water, an emulsion resin, and the roller coatability improver according to any one of claims 1 to 4, wherein the content of the roller coatability improver is 0.5 to 5% by weight based on the weight of the water, the emulsion resin, and the roller coatability improver.

Images