KR102147048B1 - The coating method of surface protecting of liquid acrylic resin molded product - Google Patents

Abstract

The present invention relates to a surface protective coating method for liquid acrylic resin (LAR) molded articles of hygienic instruments, including: a mixing step in which a LAR blend is prepared by dispersing aluminum trihydroxide (ATH) as a filler in a LAR matrix; a pouring step in which the LAR blend is poured into a mold; a step of curing LAR molded articles of hygienic instruments; a step of demolding the LAR molded articles of hygienic instruments; a step of processing and polishing the LAR molded articles of hygienic instruments; a step of applying a UV curable polysilazane coating agent for protecting the surfaces of the LAR molded articles of hygienic instruments; and curing the surfaces of the LAR molded articles of hygienic instruments gradually.

Description

LAR sanitary equipment molded product surface protective coating method {THE COATING METHOD OF SURFACE PROTECTING OF LIQUID ACRYLIC RESIN MOLDED PRODUCT}

The present invention relates to a LAR sanitary device molded product surface protection coating method, and more particularly, as a LAR sanitary device molded product surface protective coating method such as toilet, urinal, wash basin, and centrifuge, it has superior antifouling properties as well as excellent The present invention relates to a surface protective coating method for molded products of LAR sanitary devices using a UV-curable polysilazane coating that can provide water and oil repellency, surface texture retention properties, discoloration prevention properties, and non-yellowing properties.

The LAR sanitary device molded product is composed of a liquid acrylic resin matrix (LAR) and a filler such as aluminum hydroxide (ATH) dispersed in the liquid acrylic resin matrix. These LAR sanitary equipment molded products are suitably used for products such as bathtubs, washbasins, and toilets among construction materials.

However, when a LAR sanitary appliance molded article composed of a LAR matrix and an ATH filler is used in a bathtub, washbasin, toilet, etc., contaminated oil or water adheres to the surface, making it difficult to clean it even after cleaning. For this reason, in Japanese Patent Laid-Open No. 2002-255672, the surface of a base material composed of an LAR matrix and an ATH filler is roughened, and a coating agent having oil and water repellency properties is applied in the recess. The LAR sanitary appliance molded article thus obtained is composed of a substrate composed of a LAR matrix and an ATH filler, and an antifouling layer by a coating agent formed on the surface of the substrate. The molded article of LAR sanitary equipment having this antifouling layer can exhibit antifouling properties based on water and oil repellency compared to the molded article of LAR sanitary equipment in which the substrate is exposed.

However, the coating agent of the conventional molded article for LAR sanitary equipment has water and oil repellency, but is not excellent, and has a problem in that surface yellowing and surface residues occur, and further, there is a problem of changing the surface texture.

(Document 0001) Japanese Laid-Open Patent No. 2002-255672 (Publication Date: 2002.09.11)

An object of the present invention is a method of coating surface protection for molded products of LAR sanitary devices such as toilets, urinals, washbasins, and centrifuges, and has superior antifouling properties than before, as well as excellent water and oil repellency, surface texture retention properties, discoloration prevention properties, and yellowing. It is to provide a coating method for the surface protection of molded articles of LAR sanitary devices that can have non-occurrence characteristics.

The LAR sanitary device molded product surface protective coating method according to an embodiment of the present invention includes a mixing step of preparing a LAR mixture such that ATH (Aluminum Tri-Hydroxide) filler is dispersed in a LAR (Li quid Acrylic Resin) matrix, and the LAR mixture A molding step of injecting a mold into the mold, the LAR sanitary device molded product curing step, the LAR sanitary device molded product demoulding step, the LAR sanitary device molded product processing and polishing step, and the LAR sanitary device molded product surface protection UV-curable polysilazane It characterized in that it comprises the step of applying a coating agent and sequentially curing the surface of the molded article of the LAR sanitary device.

In addition, the UV-curable polysilazane coating agent for surface protection of LAR sanitary equipment molded products is organic polysilazane 5.5 to 7.5 wt%, organic solvent 85 to 90 wt%, leveling agent 2.2 to 3.5 wt% %, characterized in that it contains 0.1 to 8.3% by weight of a thickening agent.

In addition, organic polysilazane is characterized in that it has a unit represented by the following formula (1) as a repeating unit.

[Formula 1]

In addition, the organic polysilazane weight% x1 is the following Equation 1

[Equation 1]

The organic solvent weight% x2 is the following equation (2)

[Equation 2]

The smoothing additive weight% x3 is the following equation (3)

[Equation 3]

The weight% x4 of the thickener is Equation 4 below

[Equation 4]

It characterized in that it is calculated from.

In addition, the organic solvent is characterized in that the ratio of the ethyl acetate component and the diaromatic hydrocarbon (de aromatic hydrocarbons) component has a weight ratio of 1:13 to 1:15.

In addition, in the step of sequentially curing the surface of the LAR sanitary device molded product, the amount of light of the UV curing machine under the pre-curing condition in which the UV pre-curing is performed is 200 to 500 (mJ) while maintaining the distance between the surface of the LAR sanitary device molded product and the UV curing machine at 20 to 30 mm. /cm ² ) Pre-curing is performed for 1 to 2 minutes on an area of 400*400 (mm) with the amount of light, and the amount of light from the UV curing machine under this curing condition where UV main curing is performed in the sequential curing step of the surface of the LAR sanitary device molded product. Is characterized by performing the main curing for 2 to 3 minutes in an area of 400*400 (mm) with an amount of light of 1000 to 2000 (mJ/cm ² ) while maintaining the distance between the surface of the LAR sanitary device molded product and the UV curing machine at 10 to 20 mm. To do.

As can be seen from the above description, the step of sequentially curing the surface of molded LAR sanitary devices according to an embodiment of the present invention is a coating agent for protecting the surface of molded products of LAR sanitary devices such as toilets, urinals, washbasins, and centuries. It has the effect of providing surface texture retention properties, discoloration prevention properties, excellent antifouling properties, and non-yellowing properties.

1 is a flow chart using a coating process for protecting the surface of a molded article of a LAR sanitary device according to an embodiment of the present invention.
2 is an anti-fungal test report showing the results of Example 1.
3 is a test report related to antibacterial activity showing the results of Example 1.

Hereinafter, preferred embodiments of the present invention in which the object of the present invention can be realized in detail will be described with reference to the accompanying drawings. In the description of the present embodiment, the same name and the same reference numerals are used for the same configuration, and additional descriptions thereof will be omitted.

For a better understanding of the present invention, first, after explaining in detail the composition and properties of the UV-curable polysilazane coating agent for protecting the surface of LAR sanitary device molded products according to the present invention, the LAR sanitary device molded product surface protection coating method using a UV-curable polysilazane coating agent Let's explain the series of processes in turn.

1. UV curable polysilazane coating for surface protection of molded products of LAR sanitary equipment

The UV-curable polysilazane coating agent for surface protection of LAR sanitary device molded products according to an embodiment of the present invention is an organic polysilazane 5.5 to 7.5% by weight based on the total weight of the UV-curable polysilazane coating agent for surface protection of LAR sanitary device molded products. , 85 to 90% by weight of an organic solvent, 2.2 to 3.5% by weight of a leveling agent, and 0.1 to 8.3% by weight of a thickening agent.

(1) organic polysilazane

Silazane includes monomers, oligomers, cyclic and linear polymers having 1-4 Si-N repeating units in the compound. In particular, polysilazane refers to an oligomer, cyclic, polycycle, and straight-chain polymer or resin polymer having 5 or more Si-N repeating units in the compound. Polysilazane can be largely divided into inorganic polysilazane and organic polysilazane.

The organic polysilazane, which is a constituent of the present invention, has a characteristic that the amount of silicon-hydrogen bonds is reduced compared to the inorganic polysilazane. As the amount of silicon-hydrogen bonds decreases, the viscosity of polysilazane increases relatively. As the viscosity increases, an organic solvent, which is a diluting solvent, is required to be used as a surface protective coating for LAR sanitary equipment molded products. In order to be able to apply as thin as possible, the viscosity of the glass coating agent is important and the weight% of the added solvent must be adjusted. An appropriate concentration can make the coating thin, so it is convenient to have a relatively short curing time even at room temperature without the need for curing at high temperatures.

In the present invention, the organic polysilazane (organic polysilazane) may be included in a ratio of 5.5 to 7.5% by weight, if the organic polysilazane (organic polysilazane) is less than 5.5% by weight, failure to improve adhesion and crosslinking occurs, 7.5 When it exceeds the weight %, there is a problem that cracking (cracking, splitting) or surface leakage (bleed out) occurs.

(2) Organic solvent (Solvent)

As the organic solvent, a petroleum solvent aromatic or alicyclic solvent, an ether, a halogenated hydrocarbon or terpene mixture, or a mixture of these solvents may be used.

The diluting solvent used in the coating solution of the present invention may be any other diluting solvent capable of dissolving polysilazane having a Si-H bond. In consideration of storage stability, the diluting solvent is preferably a solvent capable of sustaining the ability to dissolve the organic polysilazane, and the solvent used for a long time preferably does not release gases such as silane, hydrogen, ammonia, etc. It should be stable without.

In the present invention, a mixture of ethyl acetate and de aromatic hydrocarbons was used as an organic solvent.

Ethyl acetate is stable at room temperature and pressure, and is also called ethyl ethanoate. In the field of organic chemistry, it is also used abbreviated as EtOAc or EA. It is a colorless, polar liquid that is lighter than water. It is one of the most frequently used solvents for separating or purifying reaction mixtures in organic chemistry. It is easier to work compared to existing butyl acetate.

De aromatic hydrocarbons are dearomatic solvents that remove aromatics that are harmful to humans and the environment through a hydrogenation reaction. In addition, it is an eco-friendly, low-odor solvent with almost no impurities by removing sulfur components harmful to the environment, and is a structurally very stable product. It is chemically stable and has excellent heat resistance.

The organic solvent has a weight ratio of 1:13 to 1:15 of the ethyl acetate component and the diaromantic hydrocarbons component.

In the present invention, the organic solvent (Solvent) may be included in a ratio of 85 to 90% by weight.

(3) Leveling agent

Leveling agent makes it possible to smoothly coat the coating film in an overall uniform state without being uneven when coating the surface of LAR sanitary device molded products.

Polyacrylate Alkyl was used as a leveling agent in the UV-curable polysilazane coating agent for surface protection of LAR sanitary device molded products according to an embodiment of the present invention.

Polyacrylate Alkyl is a linear polymer in the form of a molecule and has different surface tension and solubility depending on the molecular weight and the type of alkyl group.However, the molecular weight used as a surface modifier is a number average molecular weight, and there are many short alkyl groups, such as about 3,000 to 30,000. .

In general, after painting, there are defects on the surface of the coating film such as brush marks, roller marks, orange peal, cratering, pin holes, and color stains. The causes of these defects are solvent evaporation during the drying process, viscosity change due to high molecular weight, and surface tension change. By adding a smoothing additive, Polyacrylate Alkyl, to the coating agent, the viscosity is lowered, drying is delayed, and the surface is easily moistened, so that smoothness can be improved.

In the present invention, polyacrylate alkyl may be included in an amount of 2.2 to 3.5% by weight.If polyacrylate alkyl is less than 2.2% by weight, the UV curable polysilazane coating film for protecting the surface of molded products of LAR sanitary devices Due to poor spreadability, a difference in the thickness of the coating film occurs, and when it exceeds 3.5% by weight, the surface tension of the UV-curable polysilazane coating agent for surface protection of LAR sanitary devices decreases, making it difficult to control the thickness of the coating film.

(4) Thickening agent

The thickening agent plays a role in controlling the viscosity and workability of the UV-curable polysilazane coating agent for surface protection of molded products of LAR sanitary equipment.

In the present invention, Cellulose Acetate Butyrate was used as a thickening agent.

Cellulose Acetate Butyrate is a cellulose ester with medium butyl content and low viscosity. It is mainly used where low visibility is required at relatively high solids levels, is soluble in a wide range of solvents, and is compatible with many other resins.

When such cellulose acetate butyrate is dissolved in an appropriate solvent, a colorless and transparent solution is produced.In this way, Cellulose Acetate Butyrate can increase the viscosity without significantly changing other properties of the liquid. It is a substance.

In the present invention, Cellulose Acetate Butyrate may be included in a ratio of 0.1 to 8.3% by weight, and when Cellulose Acetate Butyrate is less than 0.1% by weight, UV-curable polysila for surface protection of molded products of LAR sanitary devices The stability of the fine coating agent is deteriorated and the flowability is greatly increased, which may cause a problem that the quality of the coating film is deteriorated.If it exceeds 8.3% by weight, the viscosity of the UV-curable polysilazane coating agent for protecting the surface of molded products of LAR sanitary devices is greatly increased, resulting in workability This deterioration can cause problems.

On the other hand, the organic polysilazane of the UV-curable polysilazane coating agent for protecting the surface of a molded article of LAR sanitary device according to an embodiment of the present invention has a characteristic in which two units are repeatedly formed as shown in Formula 1 below.

[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20

Here, the UV-curable polysilazane coating agent for protecting the surface of a molded article of a LAR sanitary device according to an exemplary embodiment of the present invention may preferably have an amount of the organic solvent to be added according to the fraction of x and y.

That is, the UV-curable polysilazane coating agent for protecting the surface of molded articles for LAR sanitary devices according to the embodiment of the present invention increases Si-H hydrogen bonds as the fraction of x increases, so to increase the adhesion of the coating agent, the entire The weight of the organic polysilazane relative to the mixture should be increased. In addition, in order to dissolve it well, the fraction of the organic solvent must also be increased at the same time. Conversely, in order to increase the contamination prevention efficiency of the coating agent, as the fraction of x decreases, the fraction of polysilazane and organic solvent decreases, and the amount of additives (smoothing additive and thickener) must increase. The equation for calculating this was derived as follows.

Formula to find organic polysilazane weight% (X ₁ )

[Equation 1]

[Equation 2]

Formula to calculate weight% of organic solvent (x ₂ )

[Equation 3]

Formula to find the weight% (x ₃ ) of the smoothing additive

[Equation 4]

here

x ₁ : Weight% of organic polysilazane (5.5 ~ 7.5%)

x ₂ : Weight% of organic solvent (85 ~ 90%)

x ₃ : Weight% of smoothing additive (2.2 ~ 3.5%)

x ₄ : Weight% of thickener (0.1 ~ 8.3%)

And, the weight% (x ₄ ) of the thickener is obtained from [Equation 4].

2. LAR sanitary device molded product surface protection coating method

With reference to FIG. 1, a detailed description will be given below of what process the LAR sanitary device molded product surface protective coating method according to the present invention is performed.

(1) Mixing step of preparing LAR mixture so that ATH (Aluminum Tri-Hydroxide) filler is dispersed in LAR (Liquid Acrylic Resin) matrix <S100>

The LAR mixture includes 35 to 40% by weight of LAR (Liquid Acrylic Resin) matrix and 55 to 60% by weight of silane-coated ATH (Aluminum Tri-Hydroxide) filler, but the liquid acrylic resin matrix May be made of methyl methacrylate (MMA) and polymethyl methacrylate (PMMA) mixed in a weight ratio of 5.5:4.5 to 6:4.

In addition, an additive consisting of a plasticizer, a colorant, and a curing agent may be further mixed with the LAR mixture, the plasticizer is 4 to 4.5% by weight of calcium hydroxide (CaOH2), and the pigment is 0.5 to 1% by weight of titanium dioxide (TiO2), The curing agent may be a liquid mixture consisting of 0.5 to 1% by weight of inorganic peroxide, 3-pentanediol diisobutyrate (TXIB), and silica.

(2) Molding step of injecting the LAR mixture into the mold <S200>

In the molding step <S200> of injecting the LAR mixture into the mold, the LAR mixture in which LAR, ATH, and additives are mixed is poured into the mold.

At this time, the mold is selected from materials that have low heat deformation and maintain high durability even at a temperature of about 90°C or higher, for example, made of reinforced plastic (FRP), aluminum, electric cast mold, stainless steel (STS), etc. The molded form is preferable.

(3) LAR sanitary equipment molded product curing step <S300>

In the LAR sanitary appliance molded product curing step <S300>, the molded LAR sanitary appliance molded article is placed in a curing furnace such as a burner type gas fuel curing furnace or an electric curing furnace.

At this time, after injecting the LAR mixture into the mold, the molded LAR sanitary appliance molded article starts to generate heat by itself, and the temperature rises, and heat curing is performed in the furnace for a certain period of time.

That is, 25 minutes after the start of heat generation, it reaches 35 to 45°C, most preferably 40°C, and then rises to 95°C within 1 minute, and the maximum temperature does not exceed 103°C.

Thereafter, heat curing is performed for about 2.5 to 3.5 hours, most preferably for 3 hours, under a temperature range of about 90 to 100°C, and if such curing time is insufficient, there is a concern that small cracks may occur after 1 to 2 years of product manufacturing. There is, so be careful.

In other words, in the LAR sanitary appliance molded product curing step <S300>, the temperature rises to 95°C due to heat generation of the product itself, and is then maintained at a temperature of about 90-100°C by the furnace for a certain period of time.

(4) LAR sanitary equipment molded product demoulding step <S400>

After the LAR sanitary device molded product hardening step <S300>, in the LAR sanitary device molded product demoulding step <S400>, the LAR sanitary device molded product is separated from the mold and demolded.

(5) LAR sanitary device molded product processing and polishing step <S500>

In the LAR sanitary device molded product processing and polishing step <S500>, the entire surface of the demolded LAR sanitary device molded product is processed and polished with sandpaper.

At this time, in the LAR sanitary device molded product processing and polishing step <S500>, grinding is started with coarse sand paper, and then polishing is repeated several times while changing the sand paper to fine sand paper in sequence, and finally, a molded LAR sanitary device with a smooth surface is obtained. do.

(6) Applying UV-curable polysilazane coating agent for surface protection of molded products of LAR sanitary equipment <S600>

The UV-curing polysilazane coating agent for protecting the surface of LAR sanitary equipment molded products (S300) is the UV-curable polysilazane coating described above to protect the surface of LAR sanitary equipment molded products having a smooth surface in the LAR sanitary equipment molded product processing and polishing step <S500>. This is the step of applying.

UV-curable polysilazane coating composition for protecting the surface of LAR sanitary equipment molded products, sprayed with a sponge, dry cloth, etc., before spraying the UV-curable polysilazane coating composition for protecting the surface of LAR sanitary equipment molded products. Spread lightly.

At this time, the amount of application of the UV-curable polysilazane coating composition for protecting the surface of molded products of LAR sanitary devices is not limited, but may be about 80 to 200 μm.

(7) LAR sanitary device molded product surface sequential hardening step <S700>

Sequential curing of the LAR sanitary device molded product surface <S700> is the step of applying a UV-curable polysilazane coating agent for protecting the surface of the LAR sanitary device molded product <S600>. It is the step of hardening.

LAR sanitary device molded product surface sequential curing step <S700> is the step of applying UV-curable polysilazane coating agent to protect the surface of LAR sanitary device molded product <S600>, after LAR sanitary device molded product surface protection UV-curable polysilazane coating agent is applied When it is confirmed that there is no abnormality in the coated surface of the surface protection, it is a step of sequentially curing the surface of the molded article of the LAR sanitary device using a UV curing machine.

In the step of sequentially curing the surface of the molded article of the LAR sanitary device, the UV curing may be performed in a manner in which pre-curing is performed first and then the main curing is performed secondarily.

In other words, the amount of light in the UV curing machine under the pre-curing condition where UV pre-curing is performed in the sequential curing stage of the surface of LAR sanitary device molded products is 200 to 500 (mJ/cm) while maintaining the distance between the surface of the LAR sanitary device molded product and the UV curing machine at 20 to 30 mm. ² ) Pre-curing is performed for 1~2 minutes in an area of 400*400(mm) with the amount of light.

In addition, the amount of light of the UV curing machine under this curing condition in which UV main curing is performed in the sequential curing step of the molded product surface of LAR sanitary equipment is 1000 to 2000 (mJ/mJ/mJ/ It is preferable to perform this curing for 2 to 3 minutes in an area of 400*400 (mm) with an amount of light of cm ² ).

In this way, by sequentially curing the surface protection surfaces of LAR sanitary equipment molded products, such as pre-curing and main curing, not only has superior antifouling properties, but also provides excellent water and oil repellency, discoloration prevention properties, and non-yellowing properties. There will be.

3. Properties of the surface protective coating film of LAR sanitary device molded products using UV-curable polysilazane coating agent

The UV-curable polysilazane coating agent for protecting the surface of LAR sanitary device molded products according to an embodiment of the present invention is used as a UV-curable polysilazane coating agent for surface protection of LAR sanitary device molded products through various experimental methods as follows. , And physical properties such as adhesion were measured, and the following experimental methods were used for the purpose of defining properties by means that are self-evident to those skilled in the art.

(1) Example 1

A coating composition of the composition shown in Table 1 was prepared.

Example 1 composition division content(%) Organic polysilazane 6.266 Ethyl acetate 5.331 ESOL D 79.971 Alkyl polyacrylate 3.404 Cellulose Acetate Butyrate 5.028

Organic polysilazane is 6.266% by weight according to Equation 1 in the case of IOTA's product IOTA-OPSZ-9150 x:y = 90:10, and the organic solvent is a mixed solution of Daejin Chemical's ethyl acetate and Leeil Industries' ESOL D. 85.30% by weight according to Equation 2, 3.40% by weight of Merck's alkyl polyacrylate according to Equation 3 as the smoothing additive, and 5.03% by weight of Merck’s cellulose acetate butyrate according to Equation 4 as the thickener.

To make 1 kg of the product, 853.02 g of an organic solvent having the largest weight ratio among the above ingredients is first put into a stirrer. The organic solvent is 1:15 and 53.31g of ethyl acetate and 799.71g of ESOL D are mixed. Next, 34.04 g of alkyl polyacrylate and 50.28 g of cellulose acetate butyrate were added, stirred for about 30 minutes, 62.66 g of organic polysilazane, and further stirred for about 30 minutes to obtain a coating agent.

Organic polysilazane emits a strong odor, so mix it under a positive pressure environment.

(2) Comparative Example 1-When no smoothing additive was added

Composition of Comparative Example 1 division content(%) Organic polysilazane 6.487 Ethyl acetate 5.519 ESOL D 82.789 Alkyl polyacrylate 0.000 Cellulose Acetate Butyrate 5.205

(2) Comparative Example 2-When no smoothing additive was added

Composition of Comparative Example 2 division content(%) Organic polysilazane 6.598 Ethyl acetate 5.613 ESOL D 84.205 Alkyl polyacrylate 3.584 Cellulose Acetate Butyrate 0.000

Experimental Example 1. Anti-mold test

The anti-fungal test of Example 1 was requested to the Korea Testing and Research Institute.

Mold resistance test results (Korea Testing and Research Institute KSAA218H03802006) Test Items unit Test Methods Test result Mold resistance (after 4 weeks) Rating ASTM G 21 One ※Mold strain (mixed strain): Chaetomium globosum ATCC 6205
Aspergillus brasiliensis ATCC 9642
Penicillium funiculosum ATCC11797
Aureobasidium pullulans ATCC 15233
Trichoderma virens ATCC 9645
※ Incubation time: 4 weeks
※ Reading of results: 0= do not grow
1= less than 10% growth
2= 10-30% less growth
3= less than 30-60% growth
4= more than 60% growth

As can be seen from the test results shown in Table 4, the fungal strain was inoculated in Example 1, but the development of mycelium was not confirmed. Through this, it can be seen that the anti-fungal performance of the UV-curable polysilazane coating agent for protecting the surface of molded articles of LAR sanitary devices having antibacterial, anti-fungal, and flame-retardant performance according to the present invention is excellent.

Experimental Example 2. Antibacterial test

The antibacterial test of Example 1 was requested to the Korea Testing and Research Institute.

Antibacterial performance results (Korea Standard Testing Institute KSAA118H01002002) Test Items Test result Control sample Staphylococcus aureus
ATCC 6538P Initial bacterial count 2.3 × 10 ⁴ Number of bacteria after 24h 2.1 × 10 ⁴ <0.63 Antibacterial activity value (%) 99.9 Escherichia coli
ATCC 8739 Initial bacterial count 2.5 × 10 ⁴ Number of bacteria after 24h 2.3 × 10 ⁴ <0.63 Antibacterial activity value (%) 99.9

In addition, as can be seen from the test results in Table 5, E. coli and Staphylococcus aureus were inoculated in Example 1, but it can be seen that the bacteria did not grow. Through this, it can be seen that the antibacterial performance of the UV-curable polysilazane coating agent for protecting the surface of molded articles of LAR sanitary devices having antibacterial, anti-fungal, and flame-retardant performance according to the present invention is excellent.

Experimental Example 3. Water and oil repellency/texture retention property/discoloration prevention property/yellowing occurrence property test

Film thickness Example 1 Comparative Example 1 Comparative Example 2 Water and oil repellency fitness incongruity fitness Texture retention fitness fitness incongruity Degree of discoloration fitness fitness fitness Yellowness evaluation fitness fitness fitness

Looking at the results of the physical property tests in Table 6, the UV-curable polysilazane coating agent for protecting the surface of molded products of LAR sanitary devices according to an embodiment of the present invention is suitable for protecting the surface of molded products of LAR sanitary devices. It can be seen that it has characteristics, non-yellowing characteristics, etc.

As described above, a preferred embodiment according to the present invention has been looked at, and the fact that the present invention can be embodied in other specific forms without departing from its spirit or scope in addition to the above-described embodiments is known to those skilled in the art. This is obvious to them. Therefore, the above-described embodiments should be regarded as illustrative rather than restrictive, and accordingly, the present invention is not limited to the above description and may be modified within the scope of the appended claims and equivalents thereof.

S100: mixing step S200: molding step
S300: curing step S400: demoulding step
S500: processing and polishing step S600: applying step
S700: sequential hardening step

Claims (6)

LAR(Liquid Acrylic Resin) matrix 35~40 wt%, silane coated ATH(Aluminum Tri-Hydroxide) filler 55~60 wt%, plasticizer 4~4.5 wt%, pigment 0,5~1 wt%, hardener 0,5 A mixing step of preparing an LAR mixture comprising ~1% by weight,
A molding step of injecting the LAR mixture into a mold to mold a molded article of the LAR sanitary device,
A curing step of curing the molded LAR sanitary appliance molded article,
A demolding step of separating the cured molded LAR sanitary device from the mold,
A processing and polishing step of processing and polishing the surface of the demolded LAR sanitary device molded article,
In order to protect the surface of the processed and polished LAR sanitary device molded article, the organic polysilazane 5.5 to 7.5% by weight having the unit of the following [Chemical Formula 1] as a repeating unit, an ethyl acetate component and a diaromantic hydrocarbon component 85 to 90% by weight of an organic solvent (Solvent) having a ratio of 1:13 to 1:15 by weight, 2.2 to 3.5% by weight of a leveling agent including polyacrylate alkyl, and 2.2 to 3.5% by weight of cellulose acetate butyrate (Cellulose A UV-curable polysilazane coating agent applying step of applying a UV-curable polysilazane coating agent containing 0.1 to 7.0% by weight of a thickening agent containing (Acetate Butyrate), and
UV curing is performed on the surface of the LAR sanitary device molded product coated with the UV-curable polysilazane coating agent after UV pre-curing, but the UV curing machine light amount under the pre-curing condition in which the UV pre-curing is performed is the surface of the LAR sanitary device molded product. Pre-curing is performed for 1 to 2 minutes in an area of 400*400 (mm) with an amount of light of 200 to 500 (mJ/cm ² ) while keeping the distance between the UV curing machine at 20 to 30 mm, and the UV main curing proceeds. The amount of light of the UV curing machine under this curing condition is ² to 400*400(mm) with an amount of light of 1000~2000(mJ/cm ² ) while keeping the distance between the surface of the LAR sanitary device molded product and the UV curing machine at 10~20mm. It includes a sequential curing step of proceeding 3 minutes main curing,
[Formula 1]

Where x+y ≥ 5, x,y are natural numbers, x:y=99:1 to 80:20
The organic polysilazane weight% x1 is the following [Equation 1]
[Equation 1]

The organic solvent weight% x2 is the following [Equation 2]
[Equation 2]

The smoothing additive weight% x3 is the following [Equation 3]
[Equation 3]

The weight% x4 of the thickener is the following [Equation 4]
[Equation 4]

LAR sanitary device molded product surface protective coating method, characterized in that defined in. delete delete delete delete delete

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