CN-122003475-A - Coating composition for heat insulation and sound absorption and coated steel sheet excellent in heat insulation and sound absorption properties using the same

Abstract

The present invention relates to a heat-insulating and sound-absorbing coating composition and a coated steel sheet excellent in heat-insulating and sound-absorbing properties using the same, and more particularly, to a heat-insulating and sound-absorbing coating composition comprising a polyvinyl chloride resin, a plasticizer, a foam capsule, and a ceramic-based heat-insulating pigment, wherein the foam capsule is a core-shell structure foam capsule composed of a polymer shell and a foaming agent core, a coated steel sheet using the same, and a method for manufacturing the same.

Inventors

• LI ZHENGHUAN
• Jin Chentai
• Min Guangtai
• Bai Doutian

Assignees

• 浦项股份有限公司

Dates

Publication Date

20260508

Application Date

20231220

Priority Date

20231011

Claims (16)

1. 1. A heat-insulating and sound-absorbing coating composition comprising a polyvinyl chloride resin, a plasticizer, a foaming capsule, and a ceramic-based heat-insulating pigment, Wherein the foaming capsule is a core-shell structure foaming capsule consisting of a polymer shell and a foaming agent core.
2. 2. The coating composition for heat insulation and sound absorption according to claim 1, wherein the coating composition comprises 5 to 30 parts by weight of the plasticizer, 0.5 to 10 parts by weight of the foamed capsule, and 5 to 20 parts by weight of the heat insulation pigment based on 100 parts by weight of the polyvinyl chloride resin.
3. 3. The heat-insulating and sound-absorbing coating composition according to claim 1, wherein the plasticizer is at least one selected from the group consisting of di (2-ethylhexyl) adipate (DEHA), dimethyl adipate (DMAD), monomethyl adipate (MMAD), dioctyl adipate (DOA), dibutyl sebacate (DBS), dibutyl maleate (DBM), diisobutyl maleate (DIBM), and trimethyl amyl diisobutyrate.
4. 4. The coating composition for heat insulation and sound absorption according to claim 1, wherein the polymer shell of the foamed capsule is composed of at least one olefin resin selected from polypropylene and polyethylene.
5. 5. The coating composition for heat insulation and sound absorption according to claim 1, wherein the foaming agent core of the foaming capsule comprises at least one foaming agent selected from azodicarbonamide, carboxyazodicarbonamide, benzenesulfonyl hydrazide, dinitroso pentamethylene tetramine, toluenesulfonyl hydrazide, azobisisobutyronitrile, barium azodicarbonate, sodium hydrogencarbonate and p, p' -oxybis (benzenesulfonyl hydrazide).
6. 6. The coating composition for heat insulation and sound absorption according to claim 1, wherein the foamed capsule has an average particle diameter of 5 μm to 20 μm.
7. 7. The heat-insulating and sound-absorbing coating composition according to claim 1, wherein the ceramic-based heat-insulating pigment is at least one selected from the group consisting of Fe 2 O 3 /mica, tiO 2 /mica, tiO 2 -Cr 2 O 3 , montmorillonite, illite, zeolite, siO 2 , and Al 2 O 3 .
8. 8. The heat-insulating and sound-absorbing coating composition according to claim 1, further comprising 5 to 20 parts by weight of a solvent based on 100 parts by weight of the polyvinyl chloride resin.
9. 9. The heat-insulating and sound-absorbing coating composition according to claim 8, wherein the solvent is at least one selected from the group consisting of solvent naphtha, toluene, xylene, isopropyl alcohol, cellosolve acetate and butyl cellosolve.
10. 10. A coated steel sheet excellent in heat insulation and sound absorption properties, comprising a steel sheet, a pretreatment layer formed on at least one surface of the steel sheet, and a coating layer formed on the pretreatment layer, Wherein the coating comprises the heat-insulating and sound-absorbing coating composition according to any one of claims 1 to 9.
11. 11. The coated steel sheet excellent in heat insulation and sound absorption properties according to claim 10, wherein the steel sheet is selected from the group consisting of carbon steel, aluminum alloy steel, stainless steel, copper steel, galvanized steel sheet, and binary or ternary alloy plated steel sheet containing zinc.
12. 12. The coated steel sheet excellent in heat insulation and sound absorption properties as set forth in claim 10, wherein the pretreatment layer is treated with a phosphating film, a chromate or a non-chromate chemical conversion film.
13. 13. A method for producing a coated steel sheet excellent in heat insulation and sound absorption properties, comprising a step of forming a pretreatment layer on a steel sheet, and a step of forming a coating layer on the pretreatment layer, Wherein the step of forming a coating layer comprises the steps of coating the coating composition for heat insulation and sound absorption according to any one of claims 1 to 9, and drying the coated composition.
14. 14. The method for producing a coated steel sheet excellent in heat insulation and sound absorption properties as claimed in claim 13, wherein the step of forming a pretreatment layer is performed at a thickness of 0.1 μm to 2 μm.
15. 15. The method for producing a coated steel sheet excellent in heat insulation and sound absorption properties according to claim 13, wherein the step of coating the coating composition is performed at a thickness of 40 μm to 200 μm.
16. 16. The method for producing a coated steel sheet excellent in heat insulation and sound absorption properties according to claim 13, wherein the step of drying the coating composition is performed at a temperature of 195 ℃ to 235 ℃.

Description

Coating composition for heat insulation and sound absorption and coated steel sheet excellent in heat insulation and sound absorption properties using the same Technical Field The present invention relates to a coating composition for heat insulation and sound absorption and a coated steel sheet having excellent heat insulation and sound absorption properties using the same, and more particularly, to a coating composition which has excellent heat insulation performance, reflection properties and noise reduction properties and can stably maintain the excellent heat insulation performance and noise reduction properties for a long period of time, thereby being used as a roof material of a building or the like to improve cooling/heating efficiency of a building and eliminate inconvenience caused by noise, and a coated steel sheet using the same. Background Conventionally, in order to achieve heat insulating performance, heat insulating coating compositions have been used in which silica sand, bauxite, sand, steel-making slag and other friction materials, retroreflective hollow bodies and other materials are mixed with an epoxy, acrylic or urethane type organic solvent type binder resin. However, such a heat insulating coating composition may be harmful to health when volatilized due to the use of organic solvents having serious odor and being harmful to human bodies, and has a problem of not being environment-friendly. In addition, in the case of a coating composition developed in water, although there is little harm to the human body, there is a possibility that there are problems such as poor adhesion of a coating film or occurrence of cracks, and severe tackiness of a coating film due to high temperature in summer, resulting in contamination, and the like. Furthermore, such a coating material needs to be applied to a certain thickness or more in mm units, and a drying time is several minutes to several hours, which has a limitation in application to steel sheets. Therefore, in general, in order to reduce noise, there is a case where a sound-absorbing plastic foam having a thickness of several millimeters needs to be stuck, in which case an additional sticking process is required, and the use of a film in the form of a plastic foam also causes an increase in cost. For example, korean patent application No. 10-2021-0180153 discloses a technology regarding a polyurethane foam composition for sound absorbing material that improves sound absorbing performance. Therefore, even when the thickness of the coating layer is formed as a thin film, it is expected to be effectively applied in the related art to provide a coating composition for steel sheet excellent in heat insulating ability and sound absorbing ability. Disclosure of Invention First, the technical problem to be solved An aspect of the present invention is to provide a coating composition for steel sheet excellent in heat insulating ability and sound absorbing ability. Another aspect of the present invention is to provide a steel sheet excellent in heat insulating ability and sound absorbing ability. Still another aspect of the present invention is to provide a method of manufacturing a steel sheet excellent in heat insulating ability and sound absorbing ability. (II) technical scheme According to one aspect of the present invention, there is provided a coating composition for heat insulation and sound absorption comprising a polyvinyl chloride resin, a plasticizer, a foamed capsule, and a ceramic-based heat insulation pigment, wherein the foamed capsule is a foamed capsule of a core-shell structure composed of a polymer shell and a foaming agent core. According to another aspect of the present invention, there is provided a coated steel sheet excellent in heat insulation and sound absorption properties, comprising a steel sheet, a pretreatment layer formed on at least one side of the steel sheet, and a coating layer formed on the pretreatment layer, wherein the coating layer comprises the coating composition for heat insulation and sound absorption of the present invention. According to still another aspect of the present invention, there is provided a method for manufacturing a coated steel sheet excellent in heat insulation and sound absorption properties, comprising a step of forming a pretreatment layer on a steel sheet, and a step of forming a coating layer on the pretreatment layer, wherein the step of forming a coating layer comprises a step of coating the coating composition for heat insulation and sound absorption of the present invention, and a step of drying the coated composition. (III) beneficial effects The coating film formed from the coating composition of the present invention contains a heat-insulating pigment, thereby functioning to block external heat by radiating infrared rays in sunlight, and the fine pores generated by foaming can achieve a noise reduction effect, and thus heat transfer can be minimized. In addition, it can also pl