KR102634259B1 - Coating material using eco-friendly polymer with improved dispersibility and abrasion resistance - Google Patents

Abstract

The present invention relates to a coating agent using an eco-friendly polymer with improved wear resistance and dispersibility, and contains 30 to 50% by weight of polyol derived from natural vegetable oil, 30 to 50% by weight of silica, and 0.1 to 0.5% by weight of a nanocomposite as a dispersion stabilizer. It consists of a first liquid and a second liquid containing 30 to 50 parts by weight of isocyanate based on 100 parts by weight of the first liquid. .
As a result, there is no emission of harmful substances such as bisphenol A compared to existing commercialized products, and it has the same level of wear resistance, elasticity, and tensile/tear strength as existing petroleum-based coatings, thereby extending the lifespan of concrete-based structures, recoating costs, and maintenance. It is possible to save time and money in the repair stage, and the application of nanocomposites ensures dispersion stability, so it has the advantage of not being limited by the distribution period after manufacturing.

Description

Coating material using eco-friendly polymer with improved dispersibility and abrasion resistance}

The present invention relates to a coating agent. Instead of floor coating agents, which are mainly petroleum-based epoxy products, an eco-friendly polymer with improved wear resistance and dispersibility is made using polyol derived from natural vegetable oil as a main ingredient and a silicon oxide-based nanocomposite. It relates to the coating agent used.

Polyurethane products have been widely used in many industrial or consumer applications, and this popularity is due to the relative ease of manufacture and wide mechanical properties of polyurethanes.

The synthesis of polyurethane is accomplished through the reaction of diisocyanate, polyol, and chain extender. Depending on the raw materials used, it can exhibit a very wide range of properties, and is used as a coating agent for fiber, plastic, wood, and metal materials, adhesives, and waterproofing agents. It is used widely in many areas.

Polyols used in the manufacture of polyurethane have typically been based on petroleum-derived ingredients, but with the rise in crude oil prices and especially recent global interest in the environment, the use of organic solvents, which have a negative impact on human health and the environment, has increased. Regulations are currently being expanded widely.

Accordingly, a method of using polyols based on natural vegetable oils such as soybean oil, castor oil, palm oil, rapeseed oil, and sunflower oil has been proposed. there is.

Republic of Korea Patent Publication No. 2008-0053219 discloses a novel polyether polyol produced by an alkoxylation reaction of cashew nut shell liquid, and a method for producing these novel polyetheropolyols, and Republic of Korea Patent No. 0849123 discloses vegetable oil A technology for synthesizing highly functional biodegradable polyol using phosphorus castor oil is disclosed.

However, in the process of developing a floor coating by applying polyol derived from natural vegetable oil, the first important factor is the dispersion stability of the coating, which is caused by by-products generated during the synthesis step. Therefore, when stored for more than 6 months, uniformity of the surface is not guaranteed when applied to the floor due to the occurrence of sediment (caking), and there is a problem of poor dispersion stability when defoaming during the mixing process and mixing with pigments for manufacturing colored products. .

Republic of Korea Patent Publication No. 2008-0053219

Therefore, the purpose of the present invention is to solve the problems that arise when applying polyol derived from natural vegetable oil, and by applying a silicon oxide-based nanocomposite, it is a commercialized product that eliminates problems that occur in the manufacturing and storage process of eco-friendly coating agents. and to provide a coating agent using an eco-friendly polymer with improved dispersibility.

In addition, the goal is to provide a coating agent using an eco-friendly polymer with improved wear resistance and dispersibility that is harmless to the human body as there are no problems with volatile organic compounds, environmental hormones, or residual heavy metals during and after painting as well as during the painting process.

The present invention for achieving the above object is a first liquid containing 30 to 50% by weight of natural vegetable oil-derived polyol, 30 to 50% by weight of silica, and 0.1 to 0.5% by weight of a nanocomposite as a dispersion stabilizer, and the agent This is achieved by a coating agent using an eco-friendly polymer with improved wear resistance and dispersibility, which consists of a second liquid containing 30 to 50 parts by weight of isocyanate based on 100 parts by weight of the first liquid.

The natural vegetable oil-derived polyol may have an OH equivalent of 170 to 187 and a viscosity of 700 to 1,400 cps (20°C).

The isocyanate is at least one selected from modified MDI (Methylene Diphenyl Diisocyanate) and Polymeric MDI, and the modified MDI and/or the polymeric MDI has a viscosity of 150 to 250 cps (25°C) and an NCO content of 30.5 to 32. It can be prepared by weight %.

The nanocomposite is in a core-shell form of a SiO x core and a polystyrene shell, and can be prepared with a size of 250 to 400 nm.

The coating agent using an eco-friendly polymer with improved wear resistance and dispersibility according to the present invention does not emit harmful substances such as bisphenol A compared to existing commercial products, and has wear resistance, elasticity, and tensile/tear strength equivalent to that of epoxy, a conventional petroleum-based coating agent. It is possible to extend the lifespan of concrete-based structures and save time and money in recoating costs and maintenance stages.

In addition, according to the coating agent using an eco-friendly polymer with improved wear resistance and dispersibility according to the present invention, dispersion stability is ensured by the application of nanocomposites, so there is an advantage that the distribution period after manufacture is not limited.

Figure 1 is a structural diagram of a construction cross-section on which a coating using an eco-friendly polymer with improved wear resistance and dispersibility according to an embodiment of the present invention is applied;
Figure 2 is a photo of the construction step of the coating agent using an eco-friendly polymer with improved wear resistance and dispersibility according to an embodiment of the present invention;
Figure 3 is a performance test report of a coating agent using an eco-friendly polymer with improved wear resistance and dispersibility according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

Meanwhile, all terms (including technical and scientific terms) used, unless otherwise defined, basically have the same meaning as generally understood by those skilled in the art in the field to which the present invention pertains. However, each term described below is defined in consideration of the function in the embodiment of the present invention, and may vary depending on the intention or custom of the user or operator, so a clear definition of the term is based on the content throughout the specification. It must be interpreted first.

Hereinafter, embodiments of the present invention will be described in detail.

According to an embodiment of the present invention, a coating agent using an eco-friendly polymer with improved wear resistance and dispersibility includes 30 to 50% by weight of polyol derived from natural vegetable oil, 30 to 50% by weight of silica, and 0.1 to 0.5% by weight of nanocomposite as a dispersion stabilizer. It consists of a first liquid containing and a second liquid containing 30 to 50 parts by weight of isocyanate based on 100 parts by weight of the first liquid.

Natural vegetable oil-derived polyols can be prepared in various known types. For example, BASF's natural oil-based polyol has the largest number of products on the market, with approximately 28 types. In general, products with low cross-linking density, high OH-equivalent weight, and low glass transition temperature (Tg) have high elasticity and are suitable for waterproofing or sports facilities that require elasticity. Conversely, products with high cross-linking density, Products with a high glass transition temperature (Tg) and high OH equivalent have high hardness and can be applied as industrial flooring agents. Among BASF's Sovermol products, Sovermol®750 has low viscosity, high glass transition temperature (Tg), high crosslinking density, and high OH equivalent, making it suitable as a target epoxy replacement flooring agent. The ALBODUR series, like Sovermol, is a 100% VOC (Volatile organic compound) free polyol derived from natural vegetable oil and has approximately 11 types of product lines.

Here, in the case of polyol derived from natural vegetable oil, if the OH equivalent is low, the bonding strength is excellent and the chemical properties are improved, but the hardness of the coating film increases, making it easy to be damaged by impact, and the reaction with isocyanate is rapid, so sufficient working time is not secured. there is. Conversely, if the OH equivalent is high, the cross-linking strength becomes weak and the coating becomes soft, making it difficult to use as a flooring agent in parking lots. On the other hand, if the viscosity is low, the viscosity of the product is lowered and leveling performance is improved, but pigments or silica with high specific gravity precipitate faster, causing storage problems. Conversely, if the viscosity is high, the viscosity of the product increases, which reduces leveling performance and reduces the silica content. There is a problem that wear resistance decreases because it cannot be increased. Therefore, in the present invention, a range of OH equivalent weight of 170 to 187 and viscosity of 700 to 1400 cps (20°C) was selected in consideration of repeated test results, maintenance of chemical properties, securing working time, leveling ability and storage ability, etc.

In the following experimental example, three products, ALBODUR 904, 921, and 956, are used as shown in the table below to compare the curability of the aforementioned Sovermol®750 and products with high and low elasticity and products with high and low crosslink density among the ALBODUR product line. The selected product was selected and tested, and the characteristics of the selected product are as follows.

product OH content
(OH-content) Hardness
(Shore A/D) Elongation at break
(Elongation at break) viscosity
(mPa·s) Applications/Properties

Albodur®904

6.48%

70/25

220%

500~800 For elastic coatings with high flexibility even at low temperatures (e.g. crack cross-linking membranes, refrigerated warehouse floors, joints and industrial roofs) Albodur®921 VP 6.62% 98/65 53% 700~1,000 Excellent pigment wettability, medium hardness resin coating for general industrial flooring and parking decks, easy to formulate Albodur®956 9.24% 95/45 75% 2,300 A highly reactive and functional rigid polyol for decorative floor coatings and clear and pigmented sealers.

Various types of isocyanates can be used, such as MDI (Methylene Diphenyl Diisocyanate), TDI (Toluene Diisocyanate), HDI (Hexamethylene Diisocyanate), and IPDI (Isophorone Diisocyanate). In general, MDI and TDI are used as floor waterproofing agents, and HDI and IPDI are used as hardeners for industrial paints due to their slow reactivity.

In the case of a coating agent to which the present invention is applied, the isocyanate must be appropriately selected for viscosity and NCO content. This means that if the viscosity of the isocyanate is low, the viscosity decreases after mixing with the first liquid before use of the product, increasing fluidity and speeding up reactivity, making it impossible to secure sufficient working time. Conversely, if the viscosity is high, the viscosity increases after mixing with the first liquid and sufficient leveling properties cannot be secured. On the other hand, if the NCO content of the isocyanate is low, the number of reactions with the OH groups of the polyol derived from natural vegetable oil is reduced, resulting in a decrease in physical properties. Conversely, if the NCO content is high, the reaction rate increases, making it impossible to secure sufficient working time, and hardness. There is a problem that the impact resistance decreases as the . Therefore, in the present invention, a viscosity of 150 to 250 cps and an NCO content of 30.5 to 32% by weight were selected in consideration of repetitive test results, leveling ability, securing sufficient working time, and suitability for maintaining physical properties.

In this experiment, a type of MDI that cures quickly and is relatively inexpensive was used. Specifically, polymeric MDI, WANNATE ® PM-200 from Whaua, which has a viscosity and NCO content close to the above, was used.

WANNATE ® PM-200 physical and chemical properties Appearance brown liquid Viscosity (25℃)/(mPa·s) 150~250 NCO Content/% 30.5 - 32.0 Density (25℃)/(g/cm ³ ) 1.220 - 1.250 Acid Content/% ≤0.030 Hydrolysable Chlorine/% ≤0.20

Meanwhile, the cross-linking agent forms a urethane bond when the polyol and isocyanate of the polymer react and simultaneously extends the chain within the polymer to improve physical properties. If sufficient crosslinking is achieved using only polyol and isocyanate, there may be no need to use additional crosslinking agents, and their use may be limited depending on their reactivity. In general, a cross-linking agent containing two hydroxy or amine can be used, but amine is much more reactive than hydroxy, so it cannot be used due to pot life issues, and a cross-linking agent containing four hydroxy groups can be used. Quadrol® (BASF) contains tertiary amines in its molecular structure, so it can act as a self-catalyst for the urethane reaction.

Experimental Example 1 : Reactivity test between selected vegetable oil-derived polyols and isocyanate

Hereinafter, the purpose and advantages of the present disclosure will be described in more detail through experimental examples, but the present disclosure is not limited to these experimental examples.

Table 3 below shows an experiment on the reactivity of isocyanate with various vegetable oils and cross-linking agents.

In the reactivity test below, Unilink® 2130, a urethane reaction accelerator, was added and compared to quickly progress the reactivity between polyols derived from various natural vegetable oils, including castor oil, and isocyanate.

sample
number polyol Mixing ratio (wt) for Wannate PM-200 1wt% lyrics
hour gel time
hour touch
dry
hour solidification
dry
hour Hardness One Castor oil 2.9 60m 60m 4.5h 7h or more frailty 2 Sovermol® 750 1.3 25m 30m 50m 1.5h 70D 3 Albodur® 904 1.8 31m 44m 120m 1 day or more frailty 4 Albodur® 921 1.8 50m 80m 120m 1 day or more 50D 5 Albodur® 956 1.3 17m 19m 17m 3h 75D 6 Albodur® 904/0.3% unilink 2130 1.8 28m 37m 100m 1 day or more frailty 7 Albodur® 921/0.3% unilink 2130 1.8 34m 48m 100m 1 day or more 50D 8 Albodur® 956/0.3% unilink 2130 1.3 9m 12m 14m 2h 75D 9 Castor oil/Albodur® 956 1:2 1.6 19m 20m 25m 5h 72D 10 Castor oil/Albodur® 921 1:2 2 23m 30m 35m 7h 52D 11 Castor oil/Quadrol 4:1 1.4 2m 4m 7m 16h 67D 12 Castor oil/Albodur® 921/Quadrol 1:2:0.17 1.8 15m 25m 35m 12h 70D

For application to flooring, longer pot life and shorter reaction time are more advantageous. When the pot life is 15 minutes or more, the hardening drying time is 3 hours or less, and the hardness is 70D or more, when Sovermol® 750 or Albodur® 956 is used alone, Castor oil/Albodur® 921/Quadrol (1 :2:0.17) It can be seen that the reactivity of sample numbers 2, 5, and 12 when mixed is used is desirable.

Experimental Example 2 : Experiment to confirm the physical properties of the coating film

Based on the experimental results of Experiment 1 above, three types of coated sheets were manufactured to a thickness of about 2 mm and their physical properties were confirmed.

sample
number polyol Mixing ratio (wt) for Wannate PM-200 1wt% Tensile strength (MPa) Elongation rate (%) 2 Sovermol® 750 1.3 40.9 15 4 Albodur® 921 1.8 17.8 80 5 Albodur® 956 1.3 32.5 55 12 Castor oil/ Albodur® 921/Quadrol (1:2:0.17) 1.8 18.9 100

As a result of the experiment, sample number 2 showed the highest tensile strength and an elongation rate of 15%, indicating that it can be applied as a flooring agent to replace epoxy.

Experimental Example 3: Experiment to select a dispersant with high efficiency when mixed with polyol derived from natural vegetable oil

In this experiment, polyol derived from natural vegetable oil, which replaces existing petroleum-based epoxy, was used to form a urethane bond through reaction with a crosslinking agent. For the natural plant-derived polyol, for example, Sample No. 2 (Sovermol®750) is used based on the experimental results of the above-mentioned experimental example. Using this, floor coatings were manufactured using different types of dispersants, and their degree of stabilization was examined.

The experimental method is, first, sample number 2 (Sovermol®750), the contents of silica (Si) as an extender pigment for improving wear resistance, and titanium dioxide (TiO ₂ ) as an example of a color pigment are 49.5% by weight and 47.0% by weight, respectively. It was fixed as weight percent. Meanwhile, after mixing/dispersing three types of commercially available dispersants commonly used in flooring, the stability was examined, one of the most stabilized dispersants was selected, and the nanocomposite of the present invention was added in varying amounts to ensure stability of the nanocomposite. The contributing role was confirmed. The coating agent prepared after examining the stability after mixing/dispersing through three comparative examples and two examples in which stabilizers were mixed differently, respectively, was produced after one week of production. Silica in powder form used as an anti-wear agent and titanium dioxide as a pigment were used. The sedimentation state and solidification (caking) state were analyzed and evaluated. .

In the present invention, if the content of polyol derived from natural vegetable oil is low, the viscosity of the coating agent as a product is high, which reduces the leveling property and cross-linking strength, making it easy to be damaged by impact. Conversely, if the content is high, the content of silica (Si), which is an extender pigment, is high. Since it is difficult to expect improvement in wear resistance as the amount decreases, 30 to 50% by weight was selected as a result of repeated experiments by the applicant in consideration of the mixing ratio with other compositions. Meanwhile, the selection of OH equivalent and viscosity content is as described above.

In the case of silica (Si), if the content is low, the silica content in the coating film is reduced and the wear resistance is lowered. Conversely, if the content is high, the wear resistance is improved, but the viscosity increases due to oil absorption and the leveling property decreases. As a result of repeated experiments by the applicant of the present application. Considering wear resistance and leveling properties, the content was selected to be 30 to 50% by weight. Here, the silica (Si) preferably has a silicon dioxide (SiO ₂ ) content of 98% or more, a particle size of 3 to 10 micrometers, a specific gravity of 2.6 to 2.7, an oil absorption of 35 to 40, and a Mohs hardness of 7 or more. It can be.

The nanocomposite according to the present invention is manufactured in powder form by polymerizing a hydrocarbon-based polymer as the shell and a silica (Si)-based inorganic material as the core. For example, mixing styrene monomer, which is the basis of polystyrene, with a Si-based inorganic material (e.g., red clay) in an aqueous phase, followed by heating to a temperature range of 70 ± 10°C to add a water-soluble initiator and a crosslinking agent. It is prepared by adding and polymerizing the mixture, stirring the mixture at a rotation speed of 600 ± 50 rpm to form a core-shell structure after polymerization, and providing a formation time of 18 ± 2 hours to allow the polymerization process to proceed. It can be. The core-shell type nanocomposite prepared by the above method is finally recovered in the form of a bright white powder, and this powder type nanocomposite has the advantage of being able to be stored for a long time at room temperature. The nanocomposite has a nearly spherical shape when measured with a scanning microscope. In the present invention, the hydraulic diameter of the produced nanocomposite is preferably set in the range of 300 ± 50 nm. If it is larger than the above range, the transparency is severely reduced, but the effect on improving the tear strength is insignificant. If it is smaller than the range, the particle size is small and cannot effectively prevent penetration of the coating solution, making it difficult to improve the tear strength. Therefore, the optimal range was derived as a result of repeated experiments by the applicant.

In addition, in the present invention, the nanocomposite as a dispersion stabilizer is prepared in an amount of 0.1 to 0.5% by weight. This means that if the content of the nanocomposite is lower than this, the binding force with silica decreases, and the precipitation rate of silica with a relatively high specific gravity is fast. If it is higher than this, it causes problems with the storage of the coating agent. Conversely, if it is higher than this, precipitation of silica can be prevented, but the manufacturing cost increases and product competitiveness decreases, so the applicant determined the optimal range as a result of repeated experiments.

The pigment may be, for example, titanium dioxide and may be present in an amount of 1 to 3% by weight. This means that if the pigment content is low, the hiding rate is lowered and the background surface becomes visible after work. Conversely, if the pigment content is high, a sufficient hiding rate is maintained, but there is a problem that price competitiveness is reduced due to the increased amount of pigment used.

Hereinafter, in this experimental example, the above-described nanocomposite was additionally added in the form of a dispersant to confirm stability. One week after manufacturing, the precipitation and solidification (caking) states of powdered silica (for example, MILLISIL®) used as an anti-wear agent and titanium dioxide (TiO ₂ ), a white pigment, are analyzed.

As a specific example, in the first step, sample number 2 (Sovermol®750), a polyol derived from natural vegetable oil, and three types of commercially available dispersants are mixed, and the above-described nanocomposite is added in the form of a dispersant. In order to increase the wear resistance of the floor coating, along with the dispersant, powdered silica (Milisil, 10㎛) is added (step 2), and finally, titanium dioxide (TiO ₂ ), a pigment, is mixed in powder form (step 3). Next, after one week, the precipitation and solidification (caking) states of silica and white pigment, which are anti-wear agents, and titanium dioxide are analyzed (step 4).

Comparative Example 1 Comparative example 2 Comparative example 3 Example 4 Example 5 Polyol derived from natural vegetable oil (Sovermol®750) 49.5 49.5 49.5 49.0 49.4 Dispersant 1
(EFKA 4063) 0.5 - - - - Dispersant 2
(Te Dispers 651) - 0.5 - - - Dispersant 3
(BYK 180) - - 0.5 0.5 0.5 nanocomposite - - - 0.5 0.1 Silica (10um) 47 47 47 47 47 pigment
(TiO ₂ ) 3 3 3 3 3 Sum 100 100 100 100 100 Viscosity (KU) 82 87 75 76 76 stable state Completely precipitates and becomes caking. Completely precipitates and becomes caking. Precipitates but does not caking slight silica and titanium dioxide precipitation;
Not caking slight silica and titanium dioxide precipitation;
Not caking

The results of analyzing the degree of stabilization of Sovermol®750, a currently commercialized polyol derived from natural vegetable oil, by using different types of dispersants are shown in Table 5 above. The priority is to maintain an appropriate viscosity for the coating. In particular, the lower the viscosity of a floor coating, the better the surface leveling properties.

As shown in Table 5 above, the experimental results show that when only dispersants commonly used in flooring agents are used, pigments and silica with relatively high specific gravity precipitate or solidify (caking). On the other hand, it can be seen that when the nanocomposite and dispersant (3, BYK 180) are used together, the best viscosity value and stability results are obtained. Therefore, it can be seen that using a nanocomposite as a dispersion stabilizer mixed with a polyol derived from natural vegetable oil shows the best results in terms of storage stability. Meanwhile, referring to Examples 4 and 5, it was found that there was no significant difference in viscosity and storage stability when the nanocomposite mixing ratio was 0.5% by weight and 0.1% by weight, respectively, so even if the nanocomposite was used in a small amount, the stability It can be seen that it can be secured. This is because the nanocomposite is in powder form and the size of the nanoparticles is 250-400 nm, so it has a high surface area to volume ratio, so it can be confirmed that it has excellent stability as in Example 5 even when the content is lowered to 0.1% by weight.

Experimental Example 4: Experiment to verify defoaming effect according to type of defoaming agent when mixed with polyol derived from natural vegetable oil

When a coating film is formed by a urethane reaction by mixing natural vegetable oil-derived polyol with a dispersant and various anti-foaming agents, the degree of defoaming can be analyzed and evaluated to provide a basis for securing the physical properties of floor coatings.

When applying the coating agent according to the present invention for floor coating purposes, if defoaming does not occur completely, it is difficult to maintain a smooth surface of the coating film due to air bubbles, which may hinder the formation of a coating film in the future. Accordingly, in the case of floor coatings, when bubbles are formed during the production process, the antifoam agent is induced to penetrate into the bubble membrane, and the induced antifoam agent diffuses at the interface of the bubbles, pushing out the surfactant that stabilizes the bubbles, and the self-elasticity and stabilizing material. The stabilized bubble film changes into a bubble layer with reduced bonding force and low surface tension.

The experimental method is to mix natural vegetable oil-derived polyol, dispersant, antifoaming agent, and nanocomposite according to the present invention, and disperse each mixed raw material at high speed at 2000 rpm for 1 hour. The evaluation method is to mix the manufactured product with WANNATE® PM-200, a polymeric MDI (Isocyanate), at a weight ratio of about 2.6:1, and observe the bubble removal effect within the pot life (about 30 minutes). The pot life is more than 15 minutes when mixing isocyanate with polyol, and in this experiment, the test was conducted with 30 minutes set as the maximum usable time. (This is set based on the conditions for coating the floor in the field.)

division Raw materials Example 6 Comparative Example 4 Comparative Example 5 Comparative Example 6 1 liquid Polyol derived from natural vegetable oil (Sovermol®750) 48.4 48.4 48.4 48.4 Dispersant 3
(BYK 180) 0.5 0.5 0.5 0.5 nanocomposite 0.1 0.1 0.1 0.1 Silica (10um) 47 47 47 47 pigment
(TiO ₂ ) 3 3 3 3 Defoamer 1
(BYK 1790) 0.5 0.5 0.5 - Defoamer 2
(BYK 066) 0.5 - - 0.5 Defoamer 3
(BYK 901) - 0.5 - 0.5 Defoamer 4
(EFKA 2720) - - 0.5 - Sum 100 100 100 100 2 liquid Isocyanate (WANNATE® PM-200) 38.5 38.5 38.5 38.5 defoaming effect Within the lyrics time
Completely degassed Within the lyrics time
Partial defoaming Within the lyrics time
Partial defoaming Within the lyrics time
Defoaming is not possible

As a result of the experiment, it was confirmed that complete defoaming (bubble destruction) occurred within the pot life in Example 6 in which defoamer 1 and defoamer 2 were applied together with the nanocomposite. In the remaining group using only the defoamer, it was confirmed that 100% complete defoaming did not occur within the pot life.

Experimental Example 5: Test of coating film properties

In order to confirm the film properties, a floor coating was prepared using the mixture of Example 6 in Experimental Example 4 and the following test results were confirmed. In particular, the wear resistance was much better than that of the existing petroleum-based epoxy floor coating.

division result viscosity 77.2 KU particle size 15㎛ importance 1.38 Solids volume ratio 99% Non-volatile matter 99.5% VOCs 10g/L Pot life 30 minutes Touch dry 100 minutes solidification drying 6 hours Fully cured 10 hours Hardness 72D tensile strength 32.1 MPa Tear strength 2.9N/mm elongation rate 25% Abrasion resistance performance (Taber Abraser CS 17/1,000 times / 1kg 34mg
(approximately 70 mg for solvent-free epoxy coating)

Meanwhile, in order to verify the reliability of the floor coating according to the present invention manufactured with the above combination, the Korea Construction and Living Environment Testing & Research Institute (KCL) tested it and found that it was tested in five items including impact resistance, adhesion performance, watertightness, abrasion resistance, and non-volatile content. The results shown in Figure 3 were obtained.

In order to confirm the workability of the coating agent 100 using an eco-friendly polymer with improved wear resistance and dispersibility according to the present invention, a construction test was conducted on a concrete floor, as shown in FIG. 2. The construction test was conducted in the following stages: surface treatment work on the concrete (200) base (a), mixing of the first and second liquids (b), application and leveling work, and color pattern work (c), and (d) was the construction work. This indicates the completed state. As a result of the construction test, it was confirmed that sufficient work was possible within the pot life and that leveling and workability were excellent. It was confirmed that there is no solvent smell like epoxy coating and that it is environmentally friendly to the extent that ventilation is not required after painting.

Figure 1 shows a cross-section of a coating agent using an eco-friendly polymer with improved wear resistance and dispersibility according to an embodiment of the present invention. A primer (base coat) 11, a middle coat 13, a coating agent 100 according to the present invention, and a top coat 15 may be formed on the top of the concrete 200. (Reference numeral 110 indicates silica 110 dispersed in the coating agent 100).

As seen above, the coating agent using an eco-friendly polymer with improved wear resistance and dispersibility containing natural vegetable oil-derived polyol according to the present invention is a two-component solvent-free flooring composition with excellent wear resistance and dispersion stability, and has the disadvantages of basic epoxy. It does not contain phosphorus bisphenol A or organic solvents, and does not use petroleum-based epoxy raw materials, so it has excellent quality characteristics as a carbon-reduction coating material and can be used on apartment rooftops, underground parking lots, concrete water treatment facilities, water play facilities, and ponds. Alternatively, it has the advantage of having excellent quality characteristics as a covering coating for concrete waterproofing floors such as factory floors.

The embodiments described above are embodiments of the present invention, and those skilled in the art will be able to make various modifications and variations without departing from the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but are for illustrative purposes, and the scope of the technical idea of the present invention is not limited by these embodiments. In other words, the scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

11: Primer (base coat) 13: Middle coat
15: top coat
100: coating agent 110: silica
200: concrete

Claims (4)

A first liquid containing 30 to 50% by weight of polyol derived from natural vegetable oil, 30 to 50% by weight of silica, and 0.1 to 0.5% by weight of a nanocomposite as a dispersion stabilizer, and 30 to 50 parts by weight of isocyanate based on 100 parts by weight of the first liquid. Consisting of a second liquid containing wealth,
The polyol derived from natural vegetable oil has an OH equivalent of 170 to 187 and a viscosity of 700 to 1400 cps (20°C),
The viscosity of the isocyanate is 150 to 250 cps (25°C), and the NCO content is 30.5 to 32% by weight,
The nanocomposite is in a core-shell form with a silica (Si)-based inorganic material as the core and polystyrene as the shell, and has a size of 250 to 400 nm. , A coating agent using an eco-friendly polymer with improved wear resistance and dispersibility. delete delete delete

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