KR100833274B1 - Quick-drying paint composition and preparation method thereof - Google Patents

Abstract

The present invention relates to a quick-drying coating composition and a method for producing the same, the coating composition according to the present invention, 50 to 70% by weight of a resin solution in which a solid acrylic resin is dissolved in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And 0.4 to 1% by weight of an accelerator; a method for preparing the same comprises the steps of: a) dissolving a polymerization inhibitor in methyl methacrylate (MMA) to prepare a polymerization inhibitor solution; b) dissolving paraffin wax in toluene to prepare a paraffin wax solution; c) preparing a resin solution by dissolving the solid-state acrylic resin in methyl methacrylate (MMA); d) mixing and adding methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA) to the resin solution prepared in step c); e) adding and mixing the antifoaming agent, the polymerization inhibitor solution, and the paraffin wax solution to the mixture prepared in step d). Accordingly, it is possible to provide a coating composition which is fast in drying and has excellent chemical resistance and durability.

Description

High speed drying paint composition and manufacturing method thereof

The present invention relates to a coating composition and a method for producing the same, and more particularly, to a fast drying coating composition and a method for producing the same, which has a fast drying time in coating, and has excellent chemical resistance and durability.

Epoxy resins can be widely used in various applications in combination with suitable curing agents. Epoxy paints can be largely divided into a thin film type coated using a roller as a solvent type and a thick film type coated using a rake or the like as a solventless type. Such epoxy paints have excellent adhesion properties to concrete materials, and are used as high-performance paints to protect concrete.

Accordingly, conventionally, epoxy paint was mainly used to renovate the concrete floor of a factory. However, since the epoxy paint has a slow curing rate and hardening is completed at least 3-4 days after painting, the plant requiring forklift operation had to be shut down until the curing was completed. In addition, renovation at the factory floor that handles acid-type chemicals is weak in acid resistance, so the coating film is discolored due to chemicals, peeling phenomenon appears, and maintenance work has to be frequently performed. There was a problem that the repair work of the factory floor is almost impossible in winter because the reaction is hard to harden due to the sharp drop.

On the other hand, epoxy paints were also used to paint asphalt roads, such as safety zones in front of the school and school roads, which should be secured for safety. However, the epoxy paint had to control the operation of the vehicle until the curing time was slowed down, and the curing reactivity was lowered at sub-zero temperatures, making it almost impossible to repair the road in winter. In addition, there is a problem that the maintenance work is frequently performed, such as a crack or peeling phenomenon does not withstand the properties of shrinkage and expansion according to the temperature, the durability of the coating film is broken when running the vehicle after painting on the road.

The present invention is to solve the above problems, it is an object to provide a quick-drying coating composition and a method for producing the same quick drying when coating, excellent chemical resistance and durability and excellent curing reaction at sub-zero temperatures.

Coating composition according to the present invention for achieving this object, 50 to 70% by weight of a resin solution in which a solid-state acrylic resin is dissolved in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And an accelerator 0.4 to 1% by weight.

In addition, the antifoaming agent and the polymerization inhibitor solution, paraffin wax solution; characterized in that it further comprises.

Here, the antifoaming agent based on the total weight of the total coating composition is 1 to 2% by weight, the polymerization inhibitor solution is 0.1 to 1% by weight, the paraffin wax solution 1 to 4% by weight;

In addition, the solid-state acrylic resin has a glass transition temperature (Tg) of 40 ~ 70 ℃ and the weight average molecular weight 100,000 ~ 160,000;

In addition, the resin solution is 25 to 50% by weight of the solid-state acrylic resin and 50 to 75% by weight of the methyl methacrylate (MMA) based on the total weight of the resin solution;

In addition, the peroxide curing agent is characterized in that 50% -benzoyl peroxide.

In addition, the accelerator is dimethyl-p-toluidine (Dimethyl-p-, which is an amine accelerator).

at least one selected from toluidine, N, N-dimethyl aniline, N, N-dimethyl acrylamide and 5% cobalt (5% Co) It is characterized by mixing with).

In addition, the quick-drying coating composition of the present invention, a) dissolving the polymerization inhibitor in methyl methacrylate (MMA) to prepare a polymerization inhibitor solution; b) dissolving paraffin wax in toluene to prepare a paraffin wax solution; c) dissolving the solid-state acrylic resin in methyl methacrylate (MMA) to prepare a resin solution; d) mixing and adding methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA) to the resin solution prepared in step c); e) adding the antifoaming agent, the polymerization inhibitor solution, and the paraffin wax solution to the mixture prepared in step d), and mixing the mixture.

Referring to the present invention in more detail as follows.

The present invention relates to a solid-state acrylic resin having excellent elasticity, a peroxide curing agent and an accelerator containing methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA) having high glass transition temperature (Tg) and high reactivity. It is related to a coating composition which is quick to dry during coating, has excellent chemical resistance and durability, and has excellent curing reaction even at subzero temperatures.

Next will be described in more detail for each composition component contained in the coating composition according to the present invention.

The main topic is methyl methacrylate (MMA) 20 in 50 to 70% by weight (preferably 60 to 70% by weight) of a resin solution in which a solid acrylic resin is dissolved in methyl methacrylate (MMA) based on the total weight of the total coating composition. 30 wt% and 0.1-10 wt% (preferably 1-5 wt%) of hydroxypropyl methacrylate (HPMA).

When the resin solution is less than 50% by weight, the hardness of the coating film is lowered and the viscosity of the paint is lowered, and workability is lowered. When it exceeds 70% by weight, the viscosity of the paint is increased and the appearance of the coating film is poor. At this time, the resin solution is 50 to 75% by weight of methyl methacrylate (MMA) 50 to 75% by weight (preferably 35% by weight of the solid state acrylic resin, methyl methacrylate (based on the total weight of the resin solution) MMA) 65% by weight). This is because when the solid-state acrylic resin is dissolved at less than 25% by weight, the hardness of the coating film is lowered and the dryness of the coating is lowered. When the acrylic resin is dissolved at more than 50% by weight, the viscosity of the resin becomes high, which makes handling difficult. In addition, it is preferable to use a glass transition temperature (Tg) of 40-70 degreeC and a weight average molecular weight 100,000-160,000 as a solid state acrylic resin, because the hardness of a coating film becomes suitable by using the said range.

If the methyl methacrylate (MMA) is less than 20% by weight, the viscosity of the paint is increased, so that the appearance of the coating is poor, and when it exceeds 30% by weight, the hardness of the coating is decreased. Become. In addition, when hydroxypropyl methacrylate (HPMA) is less than 0.1% by weight, the pot life is shortened, workability is poor, the appearance of the coating is poor, and when it exceeds 10% by weight, curing is slowed and the hardness of the coating is decreased.

Thus, by mixing the solid-state acrylic resin, methyl methacrylate (MMA), hydroxypropyl methacrylate (HPMA) to properly control the hardness and flexibility of the coating film to increase the adhesion to the crack and asphalt of the subject Bring. In addition, when the methyl methacrylate (MMA), hydroxypropyl methacrylate (HPMA) and the curing agent are mixed, the solid state acrylic resin may be mixed to have a better effect on the coating film becoming a solid state in a liquid state.

On the other hand, the subject may further contain an antifoaming agent, a polymerization inhibitor solution, a paraffin wax solution in order to improve the workability of the paint and the physical properties of the coating film. The antifoaming agent improves the appearance of the coating film by removing bubbles in the coating composition, and the polymerization inhibitor solution reacts when the curing agent and the dissolved acrylic resin, methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA) react. If the speed is too fast, the pot life will be shortened. At this time, the reaction time will be delayed to increase the pot life. On the other hand, if oxygen in the air penetrates the coating film during painting, methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA), which should react with the curing agent, will react with the oxygen, thereby deteriorating the hardness and durability of the coating film. By containing paraffin wax solution, it prevents oxygen in the air from penetrating the coating, improving the reactivity of the curing agent, methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA), which can increase the physical properties of the coating. will be. The antifoaming agent, the polymerization inhibitor solution, and the paraffin wax solution are contained in the range of 1 to 2% by weight of the antifoaming agent, 0.1 to 1% by weight of the polymerization inhibitor, and 1 to 4% by weight of the paraffin wax solution based on the total weight of the coating composition. It is preferable.

Peroxide curing agent is mixed in 1 to 10% by weight based on the total weight of the total coating composition, it is preferable to use 50% -benzoyl peroxide (Benzoyl peroxide). If the peroxide curing agent is used in less than 1% by weight, hardening is hardly performed. If the peroxide curing agent is used in excess of 10% by weight, the curing speed is too fast, so the appearance is poor, and the pot life is short, so that a gel may be formed during mixing. Preferably 2 to 4% by weight). In general, peroxides are liquid and powder type and explosive and dangerous. However, 50% -benzoyl peroxide is a powder type and 50% stabilizer and benzoyl peroxide are mixed to explode. There is an advantage in that it can be reduced and is easy to handle during transportation and handling.

The accelerator is mixed in an amount of 0.4 to 1% by weight based on the total weight of the total coating composition, and it is preferable to use a mixture of an amine accelerator and a metal accelerator. If the accelerator is not used within the range of 0.4 to 1% by weight, the coating film is not formed due to poor curing, and hardly hardens when only an amine accelerator or a metal accelerator is used. Therefore, it is preferable to use a mixture of an amine accelerator and a metal accelerator, and 0.3 to 1% by weight of the amine accelerator and 0.02 to 1% by weight of the metal accelerator are most effective when mixed at 0.5% by weight. good. In this case, as the amine accelerator, dimethyl-p-toluidine, N, N-dimethyl aniline, N, N-dimethyl acrylamide, N, N-dimethyl acrylamide At least one is selected and used. 5% cobalt (5% Co) is used as the metal-based accelerator.

On the other hand, the amount of the peroxide curing agent and the accelerator can be adjusted so that the reaction occurs appropriately depending on the temperature.

Referring to the production method of such a coating composition of the present invention.

First, the polymerization inhibitor is dissolved in methyl methacrylate (MMA) to prepare a polymerization inhibitor solution. Since the polymerization inhibitor does not dissolve well in the state where the resin solution or other raw materials are added, it is preferable to dissolve the polymerization inhibitor in advance. In addition, although it may be dissolved in other solvents, if a solvent other than methyl methacrylate (MMA), which is the main solvent of the coating composition, is used, it may reduce the hardness and durability of the coating film, so dissolving it in methyl methacrylate (MMA) desirable. At this time, the polymerization inhibitor is dissolved in methyl methacrylate (MMA) to 1 to 10% by weight, but when dissolved to less than 1% by weight, the curing agent and the dissolved acrylic resin, methyl methacrylate (MMA), hydroxypropyl methacrylate In the reaction of the rate (HPMA), the role of controlling the reaction rate is lowered. When the solvent is dissolved in excess of 10% by weight, the pot life of the paint is good, but the drying property is poor and the curing is slow, and the hardness of the coating film is weakened.

In addition, paraffin wax is dissolved in toluene to prepare a paraffin wax solution. Paraffin wax is solid and difficult to dissolve at room temperature and easy to dissolve at temperatures above 40 ° C. At this time, paraffin wax is dissolved in toluene to 5 to 30% by weight, but when dissolved in less than 5% by weight, the oxygen blocking effect is lowered. State, some solid state is produced and separated from the original phase). Here, either the polymerization inhibitor solution or the paraffin wax solution may be prepared first.

Next, the solid-state acrylic resin is first dissolved in methyl methacrylate (MMA) to prepare a resin solution. Secondly, methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA) are added and mixed to the prepared resin solution. The reason for the addition of methyl methacrylate (MMA) into primary and secondary parts is that when methyl methacrylate (MMA) is added to a solid-state acrylic resin from the beginning and dissolved, the number of resin synthesis is increased. Because it becomes difficult to control.

To the mixture by adding a resin solution, methyl methacrylate (MMA), and hydroxypropyl methacrylate (HPMA), add an antifoaming agent, a prepared polymerization inhibitor solution, and a paraffin wax solution to 20 to 30 at 500 to 1000 rpm. Stir for minutes and allow to mix.

It is preferable to mix and coat a peroxide curing agent after mixing an accelerator upon coating to the paint molding prepared as described above. This is because when the peroxide curing agent is mixed before the accelerator, the pot life of the paint is shortened, resulting in poor workability. In addition, if the accelerator is added in advance without mixing at the time of coating, the coating may harden during the storage of the coating. In this case, the silica sand and the coloring pigment may be mixed and coated for thickness control or coloring of the coating film.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

Example 1) to Example 6)

In a separate container, the polymerization inhibitor (1.25% by weight) was dissolved in methyl methacrylate (98.75% by weight), and in another separate container, paraffin wax (15% by weight) was dissolved in toluene (85% by weight) for polymerization. Prepare inhibitor solution and paraffin wax solution. The solid acrylic resin is first dissolved in methyl methacrylate and secondly, methyl methacrylate and hydroxypropyl methacrylate are added and mixed through a stirrer. Into the mixture of the solid acrylic resin, methyl methacrylate, and hydroxypropyl methacrylate, a silicone antifoaming agent, a polymerization inhibitor solution and a paraffin wax solution previously dissolved were added, and stirred at 500 to 1000 rpm for 20 to 30 minutes. Allow to mix evenly. Accelerator is added to the mixed paint molding to mix, and then 50% -benzoyl peroxide curing agent is added to the coating and stirred. At this time, the content of each composition is as shown in Table 1 below.

ingredient Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Resin solution 1) 61.4 61.4 61.4 61.4 61.4 61.4 Monomer 2) -1 20.8 22.8 24.8 26.8 28.8 30.8 Monomer 2) -2 10.3 8.3 6.3 4.3 2.3 0.3 Antifoam 3) 1.5 1.5 1.5 1.5 1.5 1.5 Polymerization inhibitor solution 4) 0.5 0.5 0.5 0.5 0.5 0.5 Paraffin wax solution 5) 2.0 2.0 2.0 2.0 2.0 2.0 Accelerator 6) -1 0.3 0.3 - 0.03 0.03 0.03 Accelerator 6) -2 0.1 0.05 0.3 - - - Accelerator 6) -3 - 0.05 0.05 0.37 0.1 - Accelerator 6) -4 0.05 0.1 0.05 0.1 0.37 0.1 Accelerator 6) -5 0.05 - 0.1 - - 0.37 Hardener 7) 3.0 3.0 3.0 3.0 3.0 3.0 Sum 100 100 100 100 100 100  1): Mixed solution of solid Acryl Resin (Rom & Haas) and MMA (Rotge Co.) 2) -1: MMA (Rotge Co.) 2) -2: 2-hydroxy propyl methacrylate (Donghwa Chemtech) 3): Silicone Additives (EFKA) 4): Stibine-based (Unicorn Chemical) 5): Paraffin wax (Inokhem) 6) -1: 5% Co (Donghwa Chemtech) 6) -2: Ethyl aceto Acetate 6) -3 : Dimethyl-p-toluidine 6) -4: N, N-Dimethyl aniline 6) -5: N, N-Dimethyl acrylamide 7): Benzoyl peroxide (Donghwa Chemtech)

Experiment example

Each physical property was measured by the following method, and the results are shown in Table 2 below.

Experimental Method

1. Viscosity: measured with viscometer at 25 ° C.

2. Specific gravity: Pour the paint into the specified specific gravity cup at paint temperature of 25 ℃ and measure the weight.

3. Pot life: When working in the field, paint at room temperature and open space with brush or roller every 2 ~ 3 minutes to measure the time when painting work is not possible.

4. Drying time: Measure the curing and drying after painting at room temperature and open space (the time when hand fingerprints are not left when twisted with thumb).

5. Shore D Hardness: Measure the film by coating it with Shore D hardness tester.

6. Asphalt bleeding property: Check that black color is discharged over paint due to melting of asphalt by painting on asphalt.

7. Asphalt adhesion: paint about 50 ~ 100㎛ on asphalt, dry it, scrape it with a letter X and cut off the edge with a knife to check that asphalt and coating are separated.

8. Acid resistance: Form a coating film of 1 ~ 3mm on the slate plate and immerse it in 50% sulfuric acid solution to check for abnormalities such as peeling or discoloration.

9. Water resistance: Form a coating film of 1 ~ 3mm on the slate plate and dip it in water to check for abnormalities such as peeling or discoloration.

10. Alkali resistance: Form a coating film of 1 ~ 3mm on the slate plate and soak in 10% caustic soda solution to check for abnormality such as peeling or discoloration.

11. Self levelling property: Check if the film is formed smoothly without saw blade marks when the paint is poured and scratched with saw blade rake.

12. Roller workability: Check whether roller marks remain or other appearance abnormalities are found when viscosity is not appropriate when painting with rollers.

 Experiment Item Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Viscosity (Ku / 25) 68 66 65 63 62 60 importance 0.99 0.99 1.00 1.00 1.00 1.00 Housework time 60 minutes 30 minutes 60 minutes 20 minutes 30 minutes - Drying time - 2 hours - 40 minutes 90 minutes - Shore D hardness - 45 - 75 50 - Asphalt bleeding sex - Good - Good Good - Asphalt adhesion - Good - Good Good - Acid resistance (deposition) - 7 days - Good 10 days - Water resistance (deposition) - Good - Good Good - Alkali resistance (deposition) - Good - Good Good - Self levelling (lake work) - Bad - Good Good - Roller workability - Good - Good Good -

As shown in Table 2, the best results were obtained in Example 4), and the following methods were used in the same manner as in the Experimental Example to compare physical properties with the conventional epoxy coatings for floors based on Example 4). The physical properties were compared and the results are shown in Table 3 below.

Experiment Item Example 4 Comparative Example 1) Comparative Example 2) Housework time 20 minutes 6 hours 20 minutes Drying time 40 minutes 24 hours 48 hours Full hardening time 2 hours 7 days 7 days Shore D hardness 75 - 50 Asphalt bleeding sex Good Bad Bad Asphalt adhesion Good Bad Bad Acid Resistance (50% H ₂ SO ₄ ) Good 24 hours discoloration 48 hours 24 hours discoloration 48 hours Alkali Resistance (10% NaOH) Good Good Good Water resistance (H ₂ O) Good Good Good Self levelling Good - Good Roller workability Good Good Bad State in container Good Good Good   Comparative Example 1) Solvent type epoxy paint: Epipura light green # 98-Dimming paint. Comparative Example 2) Solvent-free epoxy paint: Epideck 2000 Green STD-Dimming paint.

As described in detail above, the present invention has the following effects.

First, it contains a high-strength solid-state acrylic resin, high glass transition temperature (Tg), high reactivity, methyl methacrylate and hydroxypropyl methacrylate. The paint can be dried in 2 hours.

Second, the paint can be dried within one to two hours, thus minimizing downtime when the floor is renovated.

Third, it is excellent in durability and chemical resistance, it is possible to reduce the repair cost by extending the repair period of the plant and other plant floors dealing with chemicals such as acid.

Fourth, it has excellent adhesion with asphalt, so it is possible to paint on roads where cyanity for traffic safety such as safety zones and school roads in front of the school should be secured. Can be painted.

Fifth, by adding the curing agent and accelerator in accordance with the temperature can be cured at sub-zero temperatures can facilitate the renovation of the factory floor and road even in winter.

Claims (8)

delete Based on the total weight of the total paint composition, 50 to 70% by weight of a resin solution obtained by dissolving a solid acrylic resin in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And Including 0.4 to 1% by weight of accelerator; An antifoaming agent, a polymerization inhibitor solution, and a paraffin wax solution. The quick-drying coating composition further comprising. The method of claim 2. The antifoaming agent based on the total weight of the total coating composition 1 to 2% by weight, the polymerization inhibitor solution is 0.1 to 1% by weight, the paraffin wax solution 1 to 4% by weight; Quick-drying coating composition, characterized in that. Based on the total weight of the total paint composition, 50 to 70% by weight of a resin solution obtained by dissolving a solid acrylic resin in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And Including 0.4 to 1% by weight of accelerator; The solid acrylic resin has a glass transition temperature (Tg) of 40 ~ 70 ℃ and the weight average molecular weight 100,000 ~ 160,000; Quick-drying paint composition, characterized in that. Based on the total weight of the total paint composition, 50 to 70% by weight of a resin solution obtained by dissolving a solid acrylic resin in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And Including 0.4 to 1% by weight of accelerator; The resin solution is 25 to 50% by weight of the solid-state acrylic resin and 50 to 75% by weight of the methyl methacrylate (MMA) based on the total weight of the resin solution; Quick-drying coating composition characterized in that consisting of. Based on the total weight of the total paint composition, 50 to 70% by weight of a resin solution obtained by dissolving a solid acrylic resin in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And Including 0.4 to 1% by weight of accelerator; The peroxide curing agent is a 50% -benzoyl peroxide; Quick-drying paint composition, characterized in that. Based on the total weight of the total paint composition, 50 to 70% by weight of a resin solution obtained by dissolving a solid acrylic resin in methyl methacrylate (MMA); 20-30% by weight of methyl methacrylate (MMA); 0.1-10% by weight of hydroxypropyl methacrylate (HPMA); 1 to 10 wt% peroxide curing agent; And Including 0.4 to 1% by weight of accelerator; The accelerator is amine-based dimethyl-p-toluidine, N, N-dimethyl aniline, N, N-dimethyl acrylamide A fast-drying coating composition, characterized in that at least one or more selected from among, and mixed with 5% cobalt (5% Co) which is a metallic accelerator. a) dissolving the polymerization inhibitor in methyl methacrylate (MMA) to prepare a polymerization inhibitor solution; b) dissolving paraffin wax in toluene to prepare a paraffin wax solution; c) preparing a resin solution by dissolving the solid-state acrylic resin in methyl methacrylate (MMA); d) mixing and adding methyl methacrylate (MMA) and hydroxypropyl methacrylate (HPMA) to the resin solution prepared in step c); e) adding the antifoaming agent, the polymerization inhibitor solution, and the paraffin wax solution to the mixture prepared in step d) and mixing the mixture.