KR101010919B1 - The paint of cavitation inhibitive and endure erosion attribute - Google Patents

Abstract

PURPOSE: Paint for inhibiting erosion and cavitation is provided to improve erosion durability and painting workability by increasing elasticity and elongation, and to ensure excellent abrasion resistance, shock resistance, and scratch resistance. CONSTITUTION: Paint for inhibiting erosion and cavitation includes a quick-drying hardener solution and a modified silicone nanopower solution in a ratio of 1 : 1 ~ 2. The quick-drying hardener solution comprises polyisocyanate with 10~25 weight% NCO group. The modified silicone nanopower solution comprises 30~33 wt% polyoxypropylene diamine, 8~10 wt% polyethertriamine with 5,000 molecular weight, 10~15 wt% polydiphenyltriamine, 8~17 wt% modified amino silicone, 2~11 wt% fluorinated resin, 1~2 wt% adhesion promoter, 1~2 wt% pigment, and 10~35 wt% nanopowder.

Description

Paint for cavitation inhibitive and endure erosion attribute

The present invention relates to a paint for inhibiting erosion and cavitation, and more particularly, a super fast curing agent solution containing polyisocyanate as a main component, and a nano powder for preventing abrasion, erosion and cavitation in a corrosive medium. Erosion resistance and cavitation inhibiting paint composed of modified silicone nanopowder solution having excellent tensile strength, adhesion strength, elongation rate, ultra-fastening, and high elastic modulus mechanical properties were formed, and modified by mixing and using the curing agent solution and modified silicone nanopowder solution By making nanopowder mixed or layered in silicone solution, it can reduce erosion by reducing cavitation and contribute to prolonging the life of cavitation damage. Cavitation damage to shipyards, power plants, and chemical facilities The present invention relates to paints for preventing corrosion and cavitation that can protect the generated coat nozzles, rudders, heat exchangers, pumps, valves, pipe elbows, and the like.

With the rapid development of the industry, machinery and various equipments are increasing in speed and high output, and their use environment is diversified and polluted, and according to this trend, the occurrence of cavitation in all engineering fields using fluids. You must be careful.

When a liquid is accelerated in a fluid machine such as a pump or a hydraulic turbine using a fluid, the static pressure of the liquid is lowered below the saturated steam pressure, bubbles are formed, noise and vibration are generated, the wing surface is eroded, and the performance of the fluid machine is reduced. This phenomenon is called cavitation.

In accordance with the trend of large-scale and high speed of various facilities, excessive load is generated on the propeller or the other, and cavitation occurs accordingly, causing problems such as deterioration of efficiency and vibration, and the most serious of the cavitations is erosion.

This erosion is caused by impacting the surface with great pressure for a very short time as cavitation occurs unstable and disappears, and due to this complex and instantaneous phenomenon, accurate predictions of erosion are very difficult to perform theoretically and experimentally. . As container ships and LNG carriers have become very large, reports of other erosion cases are frequently reported in large shipyards.

As a solution to this, erosion resistant stiffeners are attached to the surface of the rudder, but it is often not possible to continue to replace the rudder or operate in a damaged state. However, the current reinforcement is not a fundamental solution by simply padding the erosion site and incurs high costs associated with the work process and materials. Meanwhile, in the case of the developed corrosion resistant coating material, there is a problem in that the workability is extremely poor and it is unsuitable for various facilities drying and repair work.

In order to solve the above problems, the present invention provides a super fast curing agent solution based on polyisocyanate, polyoxypropylene diamine, polyethertriamine, polydiphenyltriamine, modified amino silicone resin, modified fluororesin, adhesion promoter, A modified silicon nano powder solution comprising pigments and nano powders is provided, and each of the super fast curing agent solution and the modified silicon nano powder solution is sprayed as a two-component spray device to abrasion, erosion and cavitation in the corrosive medium to the modified silicon solution. It is to provide a paint for inhibiting erosion and cavitation in which nano powders to be prevented form a mixture or layer.

The present invention can replace the existing erosion-resistant coating through the increase in erosion durability due to the increase in elasticity and elongation of the paint, and excellent coating workability (ultra-high curing and adhesion strength), excellent mechanical properties (tensile strength, adhesion strength, elongation rate) , Ultra-fast curing, high elastic modulus) provides excellent abrasion resistance, impact resistance, scratch resistance, excellent low temperature curing (up to -20 ℃), coating all weather ships, and anti-fouling by reducing surface roughness and surface energy. ) The performance can be realized at the same time, and excellent impact resistance and abrasion resistance to the impact of driving, so that various cavitation damage is caused by the nano-powder added to prevent cavitation to prevent corrosion do.

In addition, the present invention can reduce the erosion phenomena by suppressing the cavitation phenomenon by providing a paint for inhibiting erosion and cavitation to contribute to extending the life of the site where cavitation damage occurs, as well as to replace the expensive metal material It can reduce the manufacturing cost and protects the cork nozzle, rudder, heat exchanger, pump, valve, pipe elbow, etc., which cause cavitation damage of shipyard, power generation facilities, and chemical facilities. And it is a technical subject to make it possible to contribute to suppression of cavitation.

The present invention is an ultra-fast curing solution consisting of 100wt% polyisocyanate having 10 to 25% by weight of NCO group, polyoxypropylenediamine 30 ~ 33wt%, polyethertriamine 8 ~ 10wt% of molecular weight 5,000, polydiphenyltriamine 10 ~ 15 wt%, modified amino silicone resin 8 ~ 17wt%, modified fluorine resin 2 ~ 11wt%, adhesion promoter 1 ~ 2wt%, pigment 1 ~ 2wt%, nano powder 10 ~ 35wt%, the modified silicon nano powder solution is provided, The ultra-fast curing agent solution and the modified silicon nano powder solution is characterized in that it is used by mixing in a ratio of 1: 1 to 2.

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According to the present invention, by providing a paint for inhibiting erosion and cavitation, the erosion durability can be increased by increasing the elasticity and elongation of the paint, and excellent coating workability can be used to replace an existing erosion coating, and excellent mechanical properties (tensile strength and adhesion strength) , Elongation rate, ultra-fast curing, high elastic modulus) provides excellent abrasion resistance, impact resistance, scratch resistance and excellent low temperature curing resistance (up to -20 ℃), as well as all weather coating, and antifouling performance by reducing surface roughness and surface energy. Can be implemented at the same time, the impact resistance and erosion resistance is excellent, so that the various cavitation damage equipment to withstand the cavitation has the effect of preventing corrosion.

In addition, the present invention can reduce the erosion phenomena by suppressing the cavitation phenomenon by providing a paint for inhibiting erosion and cavitation to contribute to extending the life of the site where cavitation damage occurs, as well as to replace the expensive metal material Reduction of manufacturing cost and corrosion protection to protect yard nozzle, rudder, heat exchanger, pump, valve, pipe elbow, etc. And it is a technical subject to make it possible to contribute to suppression of cavitation.

Hereinafter, the paint for inhibiting erosion and cavitation according to the present invention will be described in detail.

First, the present invention has excellent tensile workability, adhesion strength, elongation rate, ultra-fast curing, high elastic modulus of erosion resistance and cavitation inhibiting paint to improve the excellent coating workability, determines elongation and tensile strength, and is an ultra-fast curing agent solution, elastic and Increased erosion durability is increased due to elongation, and elongation rate, high elastic modulus exhibits excellent wear resistance, impact resistance, scratch resistance, and made of modified silicon nanopowder solution simultaneously implementing antifouling performance by reducing surface roughness and surface energy.

The ultra-fast curing agent solution is composed of 100wt% polyisocyanate (NCO group 10-25% by weight), the polyisocyanate is a material that influences the properties such as overall hardness, weather resistance, elongation, N = C = O bond (hereinafter ' NCO '), and the higher the weight% of the NCO group, the higher the hardness of the coating film after curing, and the lower the weight% of the NCO group, the lower the hardness of the coating film after curing, thereby preventing erosion and cavitation of the present invention. In the paint, polyisocyanate having an NCO group of 10 to 25% by weight is used.
The polyisocyanate is distributed in Aekyung Chemical Co., Ltd. under the trade names D-660, D-550, AK-600C, TR-60BA, TM-50Y, TM75Y, and the like.

The modified silicon nano-powder solution is 30 to 33 wt% of polyoxypropylene diamine for controlling elongation and tensile strength of the coating film, 8 to 10 wt% of polyethertriamine having a molecular weight of 5,000 to adjust the curing time, and gelation in the curing properties. 10 ~ 15wt% of polydiphenyltriamine to adjust the curing time and increase elongation, and 8 ~ 17wt% of reactive modified amino silicone resin to increase slipperiness and stain resistance , 2 ~ 11wt% of Amino-modified fluorinated resin, 1 ~ 2wt% of adhesion promoter to increase the adhesion between the raw materials and smoothness of application, and 1 ~ 2wt of pigment to show color % And quasi-spherical, non-oxidized ceramic particles with a diameter of 0.1 to 10 μm and specific gravity between 16 and 2, which are susceptible to wear, erosion, cavitation and erosion in corrosive media.After the 10 ~ 35wt% nano-powder for burring a reaction tank is turned on, maintaining the speed of 200 ~ 300rpm and prepared by homogenization by stirring for 20 ~ 30 minutes.

When the modified silicon nano powder solution is added to less than 30wt% polyoxypropylenediamine for controlling the elongation and tensile strength of the coating film, the elongation of the coating film is lowered, when more than 33wt% elongation and tensile strength increases but wear resistance It is preferable to add it within the range of 30-33 wt% by falling and causing durability fall.

The polyethertriamine having a molecular weight of 5,000 to adjust the curing time in the modified silicon nanopowder solution becomes long when the addition time is less than 8wt%, and when it is added 10wt% or more, the curing time becomes too fast. It is preferable to add within the range of 8 to 10 wt%, because the phenomenon of lowering and lowering of adhesion force appears.

In the modified silicon nano powder solution, polydiphenyltriamine, which controls the curing time in the cured product property and increases the elongation, remains less sticky to the surface when added to less than 10wt% due to the corrosion resistance and cavitation inhibiting paint properties of the present invention. After the completion of curing, the surface remains contaminated and adhesion of foreign matters well, and the wear resistance is deteriorated.When it is more than 15wt%, the curing time is fast while the durability after the curing is lowered, so it is easily broken or broken. It is preferable to add in the range of 10 to 15 wt% by being generated.

Reactive modified amino silicone resin that increases the slipperiness and antifouling property in the modified silicon nanopowder solution, when added to less than 8wt%, the slipperiness and antifouling property is reduced to prevent the adhesion of foreign matters, 17wt% When the excess amount is added, the interlayer adhesion is lowered and the elongation rate is also decreased. Therefore, the modified amino silicone resin is preferably added in the range of Silmer (ex: SilmerOH Di-100, SILTECH Corporation) or DOW CORNINGQ4. Circulated under the trade names -3667 (DOW CORNING).

When the modified fluorine resin is added in less than 2wt%, the slipperiness and antifouling property is lowered to prevent the adhesion of foreign matters, and when it is added in excess of 11wt%, the adhesive strength between layers is lowered and the elongation rate is also reduced. It is preferable to add in the range of%, such modified fluorine resin is FOMBLIN (SOLVAY SOLEXIS), GALDEN (SOLVAY SOLEXIS), Fluorolink (ex, Fluorolink TLS 5007, Fluorolink TLS 5018, Fluorolink 5032, Fluorolink P56 , Fluorolink P53, Fluorolink P58, etc.) (SOLVAY SOLEXIS).

In the modified silicon nanopowder solution, an adhesion enhancer that smoothly mixes raw materials and increases adhesion to the base material is beta- (3,4-epoxycyclohexyl) ethyl, which is a silane coupling agent having both inorganic and organic properties. Any one of trimethoxysilane (β- (3,4-epoxycyclohexyl) ethyltrimethoysilane), gamma-glycidoxypropyltrimethoxysilane, and gamma-methacryloxypropyltrimethoxysilane When the silane coupling agent is added less than 1wt%, the adhesive force decreases, and when it is added 2wt% or more, the adhesive force increases but the wear resistance decreases, so it is added within the range of 1 ~ 2wt%. It is desirable to.

In the modified silicon nano powder solution, a pigment for displaying color is added with various colors depending on the condition of the color, but when added in less than 1wt%, the color is concealed and does not appear, typically in the range of 1 to 2wt%. When added in, the desired color is obtained, and the pigment is PY-12 PANAX Yellow GF-920SH, PANAX Yellow GF-935, PY-13 PANAX Yellow GF-960, PANAX Yellow GF-967, PY-176 PANAX Yellow GF-970, PR-53: 1 PANAX Red 2C-306, PANAX Red 2C-307, PR-57: 1 PANAX Carmine HF-S and PANAX Carmine HF-S03.

The nano-powder for covering the parts susceptible to abrasion, erosion, cavitation, and erosion of the modified silicon nano powder solution that is subject to various cavitation damage is titanium, zirconium, hafnium, tantalum, niobium, tungsten, molybdenum Deposition, boron, silicon nitride, carbon nitride using any one selected from less than 10wt% erosion resistance is a problem, when added more than 35wt% erosion resistance is high effect but relatively poor adhesion Since there is a problem, it is preferable to add within the range of 10 ~ 35wt%.

The nanopowders have a good surface, adhesion, and a sufficient number of particles to be impacted to maintain good density and increased hardness (2,000 HV (500 g)) or more, and the nanopowders have a semi-spherical shape. By reducing the resistance to the ultrafast curing agent solution and the modified silicon nano-powder solution together with the best to withstand the impact of cavitation.

In addition, when the modified silicon nanopowder solution is mixed with less than 100wt% with respect to 100wt% of the ultra-fast curing agent solution, there is a problem that the effect of suppressing the cavitation phenomenon is insufficient and the construction is relatively fast, resulting in poor workability. When the modified silicon nanopowder solution is mixed at 200wt% or more with respect to 100wt% of the solution, it is preferable that the modified silicon nanopowder solution is mixed at a ratio of 1: 1 to 2 because the workability is poor because curing progresses at a very slow speed. .

Referring to the process of applying the paint for corrosion resistance and cavitation suppression according to the present invention made as described above are as follows.

First, the pretreatment process is carried out to increase the adhesion between the base and the composition according to the present invention by removing the foreign matter by pretreatment with a power tool (power tool), etc. to the equipment that is damaged various cavitation. .

When the pretreatment process is completed, using a two-component high pressure spray device on the surface of the pretreated body, the pressure is 2,000psi or more, and the hose temperature is the ultra-fast curing solution to determine the elongation and tensile strength of the paint under the conditions of 70 ~ 80 ℃, and the surface tension. The process of spraying modified silicon nanopowder solution at a ratio of 1: 1 to 2, which prevents adhesion of foreign substances such as marine organisms and significantly reduces frictional resistance with the fluid by improving the deterioration and surface fluidity, do.

When the super fast curing agent solution and the modified silicon nano powder solution are spray-sprayed on the surface of the substrate by the spraying process, the super fast curing agent solution and the modified silicon nano powder solution are cured after mixing for 1 to 2 minutes while mixing and cavitation. The process of forming a coating layer to protect the damaged equipment.

Erosion resistance and cavitation suppression coating material coated on the surface of the equipment that damages various cavitation through the process as described above is the surface roughness and the surface roughness by modified silicone having excellent mechanical properties of tensile strength, adhesion strength, elongation rate, ultra-fast curing, high elastic modulus Anti-fouling performance can be realized at the same time by reducing surface energy. Especially, nano-powder that prevents abrasion, erosion, and cavitation is mixed or layered in modified silicone, so it is excellent in impact resistance and abrasion resistance, which can withstand the impact of flight and damage various cavitations. This facility will withstand the cavitation to prevent corrosion.

Hereinafter, an embodiment of the present invention will be described.

Table 1 shows the mixing ratios of the compositions according to Examples 1 to 3 of the present invention.

First, Examples 1 to 3 changed the NCO groups of the super fast curing solution to 12% by weight, 15% by weight and 13.5% by weight, respectively. Polyoxypropylene diamine, which is a component of modified silicone nanopowder solution, is 33wt%, 33wt%, 30wt%, molecular weight 5,000 polyethertriamine is 9wt%, 9wt%, 8wt%, modified amino silicone resin 15wt%, 15wt %, 9wt%, modified fluorine resin 5wt%, 5wt%, 3wt%, polydiphenyltriamine was changed to 12wt%, 12wt%, 10wt%, respectively, the pigment and adhesion promoter 2wt%, 1wt Specimens were prepared in a fixed state, and the erosion resistance, cavitation inhibition rate, abrasion resistance, impact resistance, adhesion, and corrosion resistance were determined by the specimens and are shown in Table 2.

Erosion resistance (ASTM G32-06), cavitation inhibition rate, abrasion resistance (ASTM D3884), impact resistance (by making specimens of the paint for inhibiting erosion and cavitation of the present invention prepared by Examples 1 to 3 as described above KS D 6711), the adhesion (ASTM D4541) items were measured and the results are shown in Table 2 below.

Specimens for measuring the above items were coated with a coating of Examples 1 to 3 and the coatings of Comparative Examples 1 and 2 on a stainless steel (SUS303) having a diameter of 16.00 mm and a thickness of 10 ± 0.5 mm.

Experimental methods of the paints of Examples 1 to 3 and Comparative Examples 1 and 2 were prepared by using a commercially available ultrasonic device of 20 kHz, and attaching a test specimen to the end of the device. The solution was measured under the same conditions of distilled water, the depth of the test solution was 100 ± 10mm, the depth of the test specimen was 12 ± 4mm, the ultrasonic apparatus within ± 5% of the center of the test vessel, the temperature of the test solution 25 ± 2 ℃.

In addition, the vibration cavitation test device is an experimental device manufactured according to ASTM G32-06, and ultrasonic waves are generated on the surface of the specimen to evaluate the cavitation resistance.

Table 2 Tables for measuring the erosion resistance of the paints of Examples 1 to 3 and Comparative Examples 1 and 2. Metric unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Corrosion resistance
(Erosion rate: ASTM G32-06)
um / hr
3
2
1.5
15
3 Abrasion Resistance (ASTM D3884) mg 150 120 100 250 200 Impact resistance (KS D 6711) 1kg, 50cm 1kg, 50cm 1kg, 50cm Destruction Destruction Adhesion (ASTM D4541) MPa 8 10 10 6 8

As shown in Table 2, in Examples 1 to 3, the erosion resistance and cavitation inhibiting paints of the present invention are all in the measurement items of erosion resistance, cavitation suppression rate, abrasion resistance, impact resistance, and adhesion force as compared to Comparative Examples 1 and 2. In particular, as shown in Example 3, the higher the content of the nanopowder, the higher the effect of corrosion resistance and inhibition of cavitation.

As described above, the present invention is an ultrafast curing agent solution containing polyisocyanate as a main material, and the modified silicon nanopowder solution includes polyoxypropylene diamine, polyethertriamine, polydiphenyltriamine, modified amino silicone resin, modified fluororesin, and adhesion promoter. And a modified silicon nanopowder solution consisting of a pigment and a nano powder, respectively, and spraying each of the ultra-fast curing agent solution and the modified silicon nanopowder solution as a two-component spray device to provide a coating for ship rudder for corrosion resistance and cavitation suppression. It can reduce erosion by contributing to the reduction of cavitation and contribute to prolonging the life of the site where cavitation damage occurs. It can also be substituted for expensive metal materials to reduce manufacturing costs. Shipyard, power generation facilities, chemical facilities Nozzles and rudders causing cavitation damage It can contribute to corrosion resistance and cavitation suppression, which can protect heat exchangers, pumps, valves and pipe elbows.

Claims (3)

Ultrasonic curing agent solution consisting of 100wt% polyisocyanate having 10 to 25% by weight of NCO group,
Polyoxypropylenediamine 30 ~ 33wt%, polyethertriamine 8 ~ 10wt% with molecular weight 5,000, 10 ~ 15wt% polydiphenyltriamine, modified amino silicone resin 8 ~ 17wt%, modified fluororesin 2 ~ 11wt%, adhesion promoter Modified silicon nanocomposite composed of 10 ~ 35wt% of any one selected from 1 ~ 2wt%, 1 ~ 2wt% pigment, titanium, zirconium, hafnium, tantalum, niobium, tungsten, molybdenum, boron, silicon nitride, carbon nitride Powder solution is provided,
Corrosion resistance and cavitation inhibiting paint, characterized in that the mixture of the ultra-fast curing agent solution and the modified silicon nanopowder solution in a 1: 1 to 2 ratio delete delete