KR100574700B1 - Color painting manhole cover for sidewalk and it's method of color painting - Google Patents

Abstract

Pressed colored manhole cover of the present invention, in the manhole cover, 65 to 75% by weight of the colored polyurethane resin and 25 to 35% by weight of the polyamide resin as a hardener in the groove portion of the intaglio pattern formed on the upper surface of the metal manhole cover 60-70% by weight of the transparent polyurethane resin as the top coat, 22-32% by weight of the polyamide resin as a curing agent, and 8-15% by weight of the organic solvent as a diluent after coating the mixed color mixed resin, followed by natural curing and drying. It is characterized in that the natural cured, dried after applying the transparent mixed resin mixed with%.

According to the present invention, a colored manhole cover for a press and a method for coloring the same are filled with a colored mixed resin obtained by mixing a colored polyurethane resin as a main agent and a polyamide resin as a curing agent by filling a recessed pattern groove in the surface of the manhole cover, followed by curing at room temperature and drying. The transparent polyurethane resin, which is the main topic as the top coating, and the polyamide resin and the diluent, which are the curing agent, are applied and the curing process and drying at room temperature eliminate the need for heating process. It has elasticity and elongation, so it does not generate cracks due to shrinkage and expansion of manhole cover due to temperature difference.

In addition, by using a transparent mixed resin to coat the top of the colored mixed resin filled in the groove portion of the manhole cover to protect the colored mixed resin having a discriminating power from direct wear and damage caused by the passage of pedestrians There is an advantage.

Press, coloring, manhole, cover, intaglio, polyurethane resin, hardener, natural curing

Description

Color Painting Manhole Cover for Sidewalk and it's Method of Color Painting}

1 is a flow chart briefly illustrating a method of coloring a sidewalk colored manhole cover according to the present invention.

2 is a front view of a colored manhole cover for sidewalks in accordance with the present invention.

Figure 3 is a view showing a method of coloring the sidewalk coloring manhole cover according to the present invention.

Explanation of symbols of main parts of drawings

1 manhole cover 2 groove

3: surface treatment 4: colored mixture resin

5: transparent mixed resin

The present invention is a colored manhole cover for use as a cover of the manhole, filled with colored mixed resin in the groove of the intaglio pattern formed on the upper portion of the metal manhole cover to have a distinguishing power of the manhole cover while not only excellent wear resistance and polyurethane The present invention relates to a colored manhole cover for sidewalks, which has excellent elongation and elasticity characteristic of resin, and does not generate cracks due to shrinkage and expansion of the manhole cover due to temperature difference, and has excellent crack resistance.

In general, manhole covers installed on human sidewalks are made of cast iron, so they do not match the various colors of the sidewalk blocks, so they are not aesthetically pleasing, and in applications that require notation such as manhole covers for water, sewage, and communication cables. There was a problem that was difficult to identify because it was not noticeable.

Therefore, as a way to solve the above problems, a patent on the method of manufacturing a colored manhole cover treated with a liquid unsaturated polyester resin mixture in Korea Patent Publication No. 199595-12848 (published date 1995. 10. 23.) Although it is registered, it is a method of manufacturing by heat curing by heating for 2 to 10 hours at 150 to 250 ℃, Republic of Korea Utility Model Publication No. 20-175306 (announcement date 2000. 3. 15.) engraved surface of the manhole cover Although there is a registration regarding a manhole cover manufactured by filling a thermosetting resin with heat and then applying heat, the patent and utility model manufactures a colored manhole cover because it hardens by applying heat in coloring the intaglio of the manhole cover. There was a lot of inconvenience.

As a method for solving the problems according to the manufacturing method as described above, the Republic of Korea Patent Publication No. 10-358639 (announcement date 2002. 10. 31.) of the color of the colored epoxy resin and hardener mixed in the intaglio of the manhole cover surface The method relates to a method of manufacturing a colored manhole cover by filling a mixed paint solution and curing it at room temperature. However, epoxy resin is hard and has a poor elongation rate, causing cracks due to shrinkage and expansion of the manhole cover due to temperature difference. There was a problem that was difficult to expect.

In addition, Korea Utility Model Publication No. 20-361606 (Announcement date 2004. 9. 16.) registered a manhole cover for underground manhole cover coated with resin material similar to the color of the surrounding road on the upper part of the underground manhole cover installed on the roadside. However, this also used an epoxy resin that is difficult to expect crack resistance, filling the epoxy putty in the recess, and the resin material layer having a color by applying a resin material of a color similar to the color of the surrounding road on the flat surface The coated surface is directly exposed, causing wear and damage due to use, and failing to sufficiently exhibit its natural color.

Therefore, the present invention is a method for solving the above problems in the colored manhole cover for the sidewalk and the coloring method, the intaglio of the surface of the manhole cover color-mixed resin mixed with a colored polyurethane resin and the polyamide resin as a curing agent After filling into the pattern groove, it is cured and dried at room temperature, and then the transparent polyurethane resin, which is the main topic, is coated with a transparent mixed resin mixed with a polyamide resin and a diluent. The purpose of the present invention is to provide a pressurized colored manhole cover and a method of coloring the same, by using a polyurethane resin having excellent elasticity and elongation, which does not cause cracks due to shrinkage and expansion of the manhole cover due to temperature difference.

In addition, by using a transparent mixed resin to coat the top of the colored mixed resin filled in the groove portion of the manhole cover to protect the colored mixed resin having a discriminating power from direct wear and damage caused by the passage of pedestrians It is an object of the present invention to provide a coloring manhole cover for coloring and a method for coloring the same.

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a colored manhole cover for sidewalks and a method of coloring the same, and more particularly to a colored manhole cover for sidewalks used as a cover for a manhole, wherein a colored polyurethane resin is formed in a groove of an intaglio pattern formed on an upper portion of a metallic manhole cover. It is not only excellent in abrasion resistance, but also excellent in abrasion resistance and elasticity of polyurethane resin by coating it, and there is no crack generation due to shrinkage and expansion of manhole cover due to temperature difference. The present invention relates to a colored manhole cover for press and a method for coloring the same.

Pressed colored manhole cover of the present invention, in the manhole cover, 65 to 75% by weight of the colored polyurethane resin and 25 to 35% by weight of the polyamide resin as a hardener in the groove portion of the intaglio pattern formed on the upper surface of the metal manhole cover After filling the mixed color mixed resin mixed, it is naturally cured and dried, and on top of that, 60 to 70% by weight of the transparent polyurethane resin as a top coat, 22 to 32% by weight of a polyamide resin as a curing agent, and 8 to 15% by weight of an organic solvent as a diluent. It is characterized in that the natural cured, dried after applying the transparent mixed resin mixed with%.

The colored polyurethane resin, which is the subject of the present invention, can be prepared in various colors required by the user by adding a liquid pigment using a white polyurethane resin, and the liquid pigment is 0.5 to 100 parts by weight of the white polyurethane resin. It can be prepared by adding 1.5 parts by weight. If the liquid pigment is less than 0.5 parts by weight with respect to 100 parts by weight of the white polyurethane resin, sufficient color cannot be exhibited, and if it is more than 1.5 parts by weight, the color expression due to the excess addition does not increase further and the color becomes turbid.

And to prepare a colored mixed resin by mixing 65 to 75% by weight of the main colored polyurethane resin and 25 to 35% by weight of the polyamide resin as a curing agent, the colored polyurethane resin as the main is less than 65% by weight or poly When the amide resin exceeds 35% by weight, the hardening occurs rapidly and the hardening occurs in the process of filling the grooves of the manhole cover, resulting in deterioration of workability, and the main color polyurethane resin exceeding 75% by weight or 25% by weight of the polyamide resin as a curing agent. If less than%, there arises a problem that the curing time takes too long.

In addition, 60 to 70 wt% of the main transparent polyurethane resin, 22 to 32 wt% of the polyamide resin as a curing agent, and 8 to 15 wt% of the organic solvent are mixed with a diluent to prepare a transparent mixed resin. If the polyamide resin is less than 60% by weight or more than 32% by weight of the curing agent, the curing becomes rapid and hardens during application as a top coat, resulting in deterioration of workability, and over 70% by weight of the main transparent polyurethane resin or the curing agent. If the amide resin is less than 22% by weight, there arises a problem that the curing time takes too long.

In addition, the diluent is used to dilute the polyurethane resin to enable spray coating, using an organic solvent mainly composed of aromatic hydrocarbons and acetate, the organic solvent 40 to 60% by weight of benzene and 60 to 40% by weight of ethyl acetate It can be used by mixing. At this time, aromatic hydrocarbons such as toluene and xylene may be used instead of benzene, and acetates such as butyl acetate may be used instead of ethyl acetate. If the diluent is less than 8% by weight, the diluted viscosity is high when spraying the transparent mixed resin by spraying, so spraying is not performed well, and when the diluent exceeds 15% by weight, the viscosity is too low due to the over addition of the diluent. It is lowered, so that normal work is not achieved, and drying takes a long time, and workability is deteriorated.

In particular, the white and transparent polyurethane resins used herein have a moderate hardness and have an appropriate elongation and elasticity, so that the manhole cover shrinkage due to the temperature difference when it is filled in the groove of the manhole cover and when applied to the top, It is possible to cope with expansion, so that no crack is generated, which shows excellent crack resistance.

In addition, the present invention is not particularly limited to the polyamide resin as a curing agent, and one selected from conventionally used modified aromatic amine resins, acid anhydrides, and Jeffamines may be used.

Here, colored polyurethane resins and transparent polyurethane resins, which are generally the main subjects, may be added a silane coupling agent, a plasticizer, a flow inhibitor, a filler, and the like within the range of not impairing the object of the present invention according to the purpose and purpose thereof, and a curing agent. May be used by adding a flow inhibitor, filler, and the like.

On the other hand, the manhole cover and the surface is subjected to a surface treatment step before filling the colored mixed resin into the groove portion, it can be treated with a polyurethane resin or coated with hot dip galvanized surface.

And the coloring method of the coloring manhole cover for the press of the present invention

Iii) surface treatment by coating the groove and surface of the intaglio pattern formed on the upper surface of the metal manhole cover with polyurethane resin or by coating with hot dip galvanizing (surface treatment step);

Ii) After filling the color-treated mixed resin containing 65 to 75% by weight of the colored polyurethane resin as the main ingredient and 25 to 35% by weight of the polyamide resin as the curing agent in the grooved surface treated in the step iii), at room temperature for 10 to 14 hours. Curing and drying in nature (colored mixed resin application and first curing, drying step);

Ⅲ) 60 to 70% by weight of the transparent polyurethane resin as a top coat, 22 to 32% by weight of a polyamide resin as a curing agent, and 8 to 15% by weight of an organic solvent as a diluent, on top of the naturally cured colored mixed resin in step ii). Spraying and applying the mixed transparent mixed resin, followed by natural curing and drying at room temperature for 10 to 14 hours (transparent mixed resin applying and second curing and drying steps);

It is colored including.

In the step iii), the grooves and the surface of the metal manhole cover are surface treated in order to increase the adhesion between the colored mixed resin and the transparent mixed resin, which may be generally coated with a black polyurethane resin, and may be hot dip galvanized. It can also be coated.

The colored polyurethane resin, which is the subject in step ii), may be prepared by adding 0.5 to 1.5 parts by weight of a liquid pigment based on 100 parts by weight of a white polyurethane resin.

In addition, the white polyurethane resin and the transparent polyurethane resin which are used to manufacture the colored polyurethane resin may be those having a heavy hardness.

And the organic solvent which is a diluent in step iii) may be used by mixing 40 to 60% by weight of benzene and 60 to 40% by weight of ethyl acetate. At this time, aromatic hydrocarbons such as toluene and xylene may be used instead of benzene, and acetates such as butyl acetate may be used instead of ethyl acetate.

At this time, the natural curing in step ii) and iii), when drying at room temperature (25 ℃), it is preferable to harden and dry in the shade, the first and second curing, drying step is 10 to 14 hours respectively It will harden and dry. Here, in the first curing and drying step, when the curing and drying for 10 to 14 hours, it becomes a state capable of subsequent top coat work in a semi-dry state. When the curing and drying time is less than 10 hours, the colored resin mixture is not properly dried in the first curing and drying step so that the transparent synthetic resin sprayed onto the top is not uniformly applied. In the second curing and drying step, the transparent synthetic resin is not applied. Is not completely dried. When the curing and drying time exceeds 14 hours, in the first curing and drying step, the colored synthetic resin is over-dried, and the transparent synthetic resin applied by spraying onto the coating is not excellent in bonding with the colored synthetic resin, and in the second curing and drying step, Since the drying has already been completed, only workability is impaired. And in winter, it is preferable to make each hardening and drying time about 2 times, and to harden and dry.

Hereinafter, the coloring manhole cover for the press and the coloring method of the present invention will be described in detail with reference to the accompanying drawings.

1 is a flow chart briefly illustrating a method of coloring a colored manhole cover for a press according to the present invention. The colored manhole cover for a sidewalk colored through such a coloring method is shown in FIG. 2, and FIG. 3 is a process of the coloring method. Shows.

Iii) surface treatment (3) by coating the grooved portion 2 and the surface of the intaglio pattern formed on the upper surface of the metal manhole cover 1 with a polyurethane resin or by coating with hot dip galvanizing (surface treatment step);

Ii) a colored mixed resin (4) obtained by mixing 65 to 75% by weight of the colored polyurethane resin as a main ingredient and 25 to 35% by weight of the polyamide resin as a curing agent to the groove (2) subjected to the surface treatment (3) in step (iii); Naturally curing and drying at room temperature for 10 to 14 hours after filling (colored mixed resin coating and first curing, drying step);

Iii) 60 to 70% by weight of the transparent polyurethane resin as a top coat as the top coat on the naturally cured colored mixed resin 4 in step ii), 22 to 32% by weight of the polyamide resin as the curing agent, and 8 to 15 organic solvents as the diluent. Spraying and applying the transparent mixed resin 5 mixed with the weight% by natural curing and drying at room temperature for 10 to 14 hours (transparent mixed resin and second curing, drying step);

Pressed colored manhole covers are painted through.

As shown in FIG. 3, the colored mixed resin 4 having the discriminating power filled in the groove 2 of the manhole cover 1 is filled to about 2/3 of the height of the groove 2 and is transparent to the top. By applying (5), the colored mixed resin 4 can be prevented from being directly exposed to the outside even when the transparent mixed resin is worn or damaged by the passage of a pedestrian, so that wear and damage can be prevented as much as possible.

Hereinafter, the colored manhole cover for the press and the coloring method according to the present invention will be described in detail by way of examples.

(Examples 1 to 3 and Comparative Examples 1 to 4)

The metal manhole cover was coated by hot dip galvanizing and surface treatment, and the colored mixtures of Examples 1 to 3 and Comparative Examples 3 and 4 prepared in the composition range as shown in the following [Table 1] were cured for 12 hours. After drying, the transparent mixed resin was applied by spraying to the top, and then cured and dried for 12 hours to prepare a colored manhole cover for press. In Comparative Examples 1 and 2, each colored mixed resin was filled, and then cured and dried for 24 hours.

(Examples 1 to 3)

Examples 1 to 3 used colored polyurethane resins prepared by adding 100 g of pigment to 10 kg of polyurethane resin.

(Comparative Examples 1 to 4)

Comparative Example 1 used a colored epoxy resin as a subject when preparing colored mixed resins, and Comparative Examples 2 to 4 used the same colored polyurethane resin as the example.

TABLE 1

division Example Comparative example One 2 3 One 2 3 4 Colored mixed resin subject Colored Polyurethane Resin 6.5 7.0 7.5 - 7.0 6.0 7.0 Colored epoxy resin - - - 7.0 - - - Hardener 3.5 3.0 2.5 3.0 3.0 4.0 3.0 Transparent mixed resin subject Transparent Polyurethane Resin 6.0 6.5 7.0 - - 6.5 6.0 Hardener 3.2 2.7 2.2 - - 2.7 2.0 diluent 0.8 0.8 0.8 - - 0.8 2.0

1) White Polyurethane Resin: Urethane Rubber (# 1600 Autumn, Gangnam Hwaseong)

2) Transparent polyurethane resin: Acrylic urethane (# 208 transparent, construction chemical)

3) Epoxy Resin (YD-128M, Kukdo Chemical)

4) Pigment: Light green (all-round colorant, construction chemical)

5) Polyurethane Resin Curing Agent: Polyamide Resin (G5022, Kukdo Chemical)

6) Epoxy Resin Hardener: Amine (YC 205H, Kukdo Chemical)

7) Diluent: Urethane Thinner (DR-700, Nose Top Paint)

In addition, the colored mixed resins of Examples 1 to 3 and Comparative Examples 3 and 4 prepared in the composition ranges as shown in [Table 1] and the test pieces coated with transparent mixed resins as tops and colored mixed resins as in Comparative Examples 1 and 2 only. The test specimens were prepared and measured for their respective physical properties. The coloring of the colored manhole cover for the press prepared using the colored mixed resin and the transparent mixed resin as in Examples 1 to 3 and Comparative Examples 1 to 4 was shown above. The wear resistance and crack resistance of the part and the curing time and workability were measured and the results are shown in [Table 2].

TABLE 2

division Example Comparative example One 2 3 One 2 3 4 Tensile Strength (㎏f / ㎠) 32 34 35 14 32 33 34 Elongation (%) 795 790 810 380 780 725 785 Tear strength (㎏f / ㎝) 21 22 24 6 20 21 23 Wear resistance ○ ○ ○ ○ ○ ○ ○ Crack resistance ○ ○ ○ × ○ ○ ○ Curing, Drying Time (hr) First curing, drying 12.5 12.5 12 12.5 24 9.5 12.5 Second curing, drying 12 12 12.5 12.5 - 12.5 15 Workability Good Good Good Good Good usually Bad

1) Tensile strength, elongation rate, tear strength: measured according to KS F 3211.

2) Wear resistance: measured according to KS M 5322.

-Abrasion loss less than 500mg per 100 revolutions: ○, 500 ~ 1,000mg: △, 1,000mg over: ×

3) Crack resistance was measured by checking the presence of cracks in the colored mixed resin and the transparent mixed resin by repeating the process of changing the temperature of each manhole cover to -20 to 60 ° C 20 times.

-No crack: ○, slight crack: △, severe crack: ×

4) curing, drying

Drying time after injecting the colored mixed resin into the manhole cover and applying the transparent mixed resin at 25 ° C. was measured using a drying time recorder (Erichsen. Model 504).

As shown in Table 2, Examples 1 to 3 exhibited excellent tensile strength, elongation rate and tear strength, and also showed excellent wear resistance, and in particular, by applying a transparent mixed resin on top of the colored mixed resin as a top layer. No wear or damage of colored mixtures. In addition, it has elasticity and elongation rate peculiar to polyurethane resin, and it is also excellent in the elongation rate measurement, and it is possible to cope with shrinkage and expansion of manhole cover according to temperature change.

However, Comparative Example 1 is a colored mixed resin prepared by using colored epoxy resin, and filled in the intaglio pattern groove of the manhole cover. The tensile strength and elongation rate are low, and it does not cope with shrinkage and expansion of the manhole cover due to temperature change. As many cracks occurred, crack resistance was very low. In addition, Comparative Example 2 is filled in the intaglio pattern groove of the manhole cover by using a colored mixed resin, the overall mechanical properties, abrasion resistance and crack resistance was excellent, but the transparent mixed resin is not applied to the top As a result, it was predicted that the colored blends with discernment would wear and damage directly under continuous external exposure.

In Comparative Example 3, when the curing agent was added in excess of the use range in the production of colored mixed resin, the mechanical properties, abrasion resistance, and crack resistance were excellent.However, in the process of filling the colored mixed resin into the groove of the manhole cover, curing was performed. Started quickly, causing inconvenient work, and reduced workability.

In Comparative Example 4, when the diluent added to the transparent synthetic resin was added beyond the use range, the viscosity of the manhole cover was too low when spraying the transparent synthetic resin so that the sprayed transparent synthetic resin was not uniformly applied, and the curing and drying time It took too long and lost workability.

According to the present invention, a colored manhole cover for a press and a method for coloring the same are filled with a colored mixed resin obtained by mixing a colored polyurethane resin as a main agent and a polyamide resin as a curing agent by filling a recessed pattern groove in the surface of the manhole cover, followed by curing at room temperature and drying. By applying transparent mixed resin mixed with polyurethane resin and diluent, which is the main topic as a top coat, and curing at room temperature, it does not require heating process and has excellent abrasion resistance. It has elasticity and elongation, so it does not generate cracks due to shrinkage and expansion of manhole cover due to temperature difference.

In addition, by using a transparent mixed resin to coat the top of the colored mixed resin filled in the groove portion of the manhole cover to protect the colored mixed resin having a discriminating power from direct wear and damage caused by the passage of pedestrians There is an advantage.

Claims (8)

A colored manhole cover for press, comprising: a colored mixed resin obtained by mixing 65 to 75% by weight of colored polyurethane resin and 25 to 35% by weight of a polyamide resin as a hardening agent in the groove of the intaglio pattern formed on the upper surface of the metal manhole cover After filling, it was naturally cured and dried, and transparent mixed with 60 to 70% by weight of the transparent polyurethane resin, which is the main coating material, 22 to 32% by weight of the polyamide resin as the curing agent, and 8 to 15% by weight of the organic solvent as the diluent. A colored manhole cover for sidewalks, which is cured and dried after applying the resin. The colored colored manhole cover according to claim 1, wherein the colored polyurethane resin is manufactured by adding 0.5 to 1.5 parts by weight of a liquid pigment based on 100 parts by weight of a white polyurethane resin. 3. The colored manhole cover for press use according to claim 2, wherein the white polyurethane resin and the transparent polyurethane resin have a heavy hardness. The method of claim 1, wherein the curing agent polyamide resin is a colored manhole cover for the press, characterized in that one selected from modified aromatic amine resin, acid anhydride, Jeffamine (Jeffamine) instead of polyamide resin. According to claim 1, wherein the diluent organic solvent is a colored manhole cover for the sidewalk, characterized in that used by mixing 40 to 60% by weight of benzene and 60 to 40% by weight of ethyl acetate. Iii) surface treatment (3) by coating the grooved portion 2 and the surface of the intaglio pattern formed on the upper surface of the metal manhole cover 1 with a polyurethane resin or by coating with hot dip galvanizing (surface treatment step); Ii) a colored mixed resin (4) obtained by mixing 65 to 75% by weight of the colored polyurethane resin as a main ingredient and 25 to 35% by weight of the polyamide resin as a curing agent to the groove (2) subjected to the surface treatment (3) in step (iii); Naturally curing and drying at room temperature for 10 to 14 hours after filling (colored mixed resin coating and first curing, drying step); Iii) 60 to 70% by weight of the transparent polyurethane resin as a top coat as the top coat on the naturally cured colored mixed resin 4 in step ii), 22 to 32% by weight of a polyamide resin as a curing agent, and an organic solvent 8 to 15 as a diluent. Spraying and applying the transparent mixed resin 5 mixed with the weight% by natural curing and drying at room temperature for 10 to 14 hours (transparent mixed resin and second curing, drying step); Method for coloring the sidewalk coloring manhole cover, which is characterized in that it is colored. The colored polyurethane resin as claimed in claim 6, wherein the colored polyurethane resin, which is the subject of step ii), is prepared by adding 0.5 to 1.5 parts by weight of a liquid pigment with respect to 100 parts by weight of the white polyurethane resin. Way. 8. The method of coloring a pressurized colored manhole cover according to claim 7, wherein said white polyurethane resin and said transparent polyurethane resin have a heavy hardness.

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