KR101838171B1 - Thermal barrier transparency sheet and manufacturing method thereof - Google Patents

Abstract

The present invention relates to a thermal barrier transparent sheet which has a high light transmittance in the visible light range and has high thermal barrier properties in the infrared ray range, and a manufacturing method of the thermal barrier transparent sheet. The purpose of the present invention is to provide the thermal barrier transparent sheet which enables aluminum particles harmful to the human body to be used in a minimum amount, is safe in the health aspect due to good transparency, is excellent in lighting, and has an excellent shade effect, and the manufacturing method of the thermal barrier transparent sheet. The manufacturing method of the present invention comprises the processes of: mixing 100 parts by weight of a polycarbonate (PC) resin with 0.00001 to 0.5 part by weight of a composite metal oxide having a longest diameter of 1 nm to 100 μm including tungsten and three or more metals selected from the group consisting of Bi, Cu, Cd, Ca, Co, Mn, Cr, Mg, Fe, Mo, Sn, Sb, and Cs to prepare a first master batch; mixing 100 parts by weight of the PC resin with 0.05 to 0.15 part by weight of aluminum particles having a longest diameter of 1 to 5 μm to prepare a second master batch; and mixing 100 parts by weight of the PC resin with 10 parts by weight of the first master batch and 1 part by weight of the second master batch to manufacture the thermal barrier transparent sheet.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thermal barrier transparency sheet and a manufacturing method thereof,

In particular, the present invention relates to a heat-shielding transparent sheet having high light transmittance in the visible light region and high light ray shielding property in the infrared region, and a method for manufacturing the same. .

The sunlight is divided into ultraviolet rays (UV), Visible light rays (VIS) and infrared rays (IR). The sunlight is about 6%, visible light is about 46%, infrared light is about 48 %. Thus, infrared rays, which do not contribute to mining but generate heat, account for nearly half of the sun's rays.

Infrared rays are classified into near-infrared rays (0.75-3 μm), infrared rays (3-25 μm), and far-infrared rays (25 μm or more) depending on wavelengths. They are characterized by having stronger heat effects than visible rays or ultraviolet rays. Also called hot wire. Most of the radiant heat transmitted from the sun or heating element to space is due to this infrared light.

On the other hand, a construction material such as a skylight, a building mining board, a roofing material, a canopy, a window or a safety glass, a swimming pool, an indoor gym roof, a greenhouse or a soundproof wall and a polycarbonate Is widely used as a substitute for glass.

Since the commercial production of Bayer and Sabic (formerly GE Plastics) in the early 1950s, PC has led commercial production in Teijin, Idemitsu, Mitsubishi and Dow, and is the only transparency of general engineering plastics. It is used in a wide range of fields such as electric / electronic field, optical device field, automobile field, building field, medical field, food container and other living materials.

Such a sheet using a PC is usually produced by extrusion molding, and is characterized by excellent transparency and excellent strength.

In other words, the PC sheet is generally made of a transparent material such as glass because it is used as a mining plate and a window of a roof, a wall, a vehicle, etc. instead of a glass, and it satisfies a transmittance of 85% or more of the total sunlight.

Accordingly, the PC sheet used in the conventional outdoor structures and vehicles has a high sunlight transmittance for mining such as glass, and thus has a high transmittance in the infrared region. Due to the infrared characteristic described above, the internal temperature of the structure and the vehicle And the sensible temperature rises. As a result, the air-conditioning cost is increased and the sheet is bent due to thermal expansion and contraction, thereby shortening the service life of the product.

In order to solve this problem, various methods have been used to obtain a heat insulation effect, such as using a milky white PC sheet, laminating an infrared reflective film on one side of a PC sheet, or applying an infrared reflective film on one side of a PC sheet.

However, in the case of using a milky white PC sheet, there is a problem that the outer appearance of the PC sheet is easily deteriorated. In the case of forming an infrared ray reflection film or an infrared ray reflection film on one side of the PC sheet, a separate lamination for forming an infrared ray reflection film and an infrared ray reflection film There is a problem in that the productivity is deteriorated due to the necessity of a process, a deposition process or a coating process. In addition, the infrared reflective film is easily peeled off and easily worn.

Therefore, in order to solve the above-mentioned problem, Korean Patent Registration No. 10-0900194 (registered on May 25, 2009) discloses a method of infrared ray shielding without forming an infrared ray reflection film or an infrared ray reflection film on a PC sheet through a separate process Discloses an infrared ray shielding sheet comprising a PC resin and aluminum particles for infrared ray shielding so as to be excellent. The infrared ray blocking sheet according to the above patent application uses an infrared ray reflection effect of aluminum particles by blending 5-10 占 퐉 of aluminum particles with a pigment in the PC resin.

The aluminum used for infrared reflection in the above patent is light, easily rust-proof, easy to process, and can increase light-blocking efficiency by blending aluminum particles. However, the transparency of the PC sheet, which is a fundamental reason for using the PC sheet, There is a problem.

KR 10-1995-0013481 B1 (Bulletin issued on November 8, 1995) KR 10-2003-0017311 A (Published 03.03.2003) US 6777087 B2 (registered on Aug. 17, 2004) KR 10-0669156 B1 (Announced on January 15, 2007) KR 10-0701735 B1 (Bulletin of Mar. 29, 2007) KR 10-0729799 B1 (Announced on June 20, 2007) KR 10-0900194 B1 (Bulletin of Mar. 02, 2009) KR 10-1446513 B1 (Announcement of October 10, 2014) KR 10-1413462 B1 (Announcement 2014 07.01)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-mentioned problems of the related art, and it is an object of the present invention to provide a method of manufacturing a plasma display panel, which does not form an infrared reflection film or an infrared reflection film through a separate process on a PC sheet, A heat-shielding transparent sheet capable of securing heat shielding and transparency, and a method of manufacturing the same.

Another object of the present invention is to provide a heat-shielding transparent sheet capable of efficiently shielding infrared rays from sunlight while being harmless to the human body at a low cost, and a method for manufacturing the same.

It is a further object of the present invention to provide a method for masterbatching a heat insulating additive to be blended secondarily to a PC resin for heat shielding, And a method of manufacturing the transparent sheet.

A method of manufacturing a heat shielding transparent sheet according to the present invention includes the steps of forming a transparent resin layer on a substrate by using a polycarbonate resin and at least one of Bi, Cu, Cd, Ca, Co, Mn, Cr, Mg, Sb and Cs and tungsten is mixed with 0.00001-0.5 parts by weight of the composite metal oxide with respect to 100 parts by weight of the PC resin to prepare a composite metal oxide having a maximum diameter of 1 nm to 100 mu m Manufacturing a first master batch (Master Batch); 0.05-0.15 parts by weight of aluminum particles having a maximum diameter of 1-5 mu m with respect to 100 parts by weight of PC resin to prepare a second master batch; 10 parts by weight of the first masterbatch and 1 part by weight of the second masterbatch are blended with 100 parts by weight of the PC resin to prepare a heat shielding transparent sheet.

Further, in the method of manufacturing a heat shielding transparent sheet according to the present invention, the first master batch manufacturing process may include mixing 0.00001-0.5 parts by weight of the composite metal oxide with 100 parts by weight of the PC resin by a blender, Melting and kneading the PC resin and the composite metal oxide with a vented single-screw extruder, and extruding the molten and kneaded material at a discharge rate of 10-25 kg / h, a screw rotation rate of 100-250 rpm, an extrusion temperature of 250-350 ° C, Followed by drying at 100-120 [deg.] C for 3-4 hours using a drier.

Also, in the method of producing a heat-shielding transparent sheet according to the present invention, the second master batch manufacturing process may be performed by mixing 0.05-0.15 parts by weight of aluminum particles having the longest diameter of 1-5 mu m with 100 parts by weight of PC resin with a blender Melting and kneading the mixed PC resin and the aluminum particles with a vent type single screw extruder, and kneading the molten and kneaded material with a discharge amount of 15-30 kg / h, a screw rotation speed of 150-300 rpm, an extrusion temperature of 200-300 Deg.] C and drying at 100-120 [deg.] C for 2-3 hours using a hot air drier.

In the method for producing a heat-shielding transparent sheet according to the present invention, the PC sheet is manufactured by blending 10 parts by weight of the first masterbatch and 1 part by weight of the second masterbatch with 100 parts by weight of the PC resin Melting and kneading the mixed PC resin, the first and second master batches with a vented single-screw extruder, and kneading the melted and kneaded materials at a discharge rate of 200-500 kg / h, a screw rotation rate of 60-120 rpm , And extruding the mixture at an extrusion temperature of 200-350 占 폚.

In addition, the heat-shielding transparent sheet according to the present invention comprises 100 parts by weight of a polycarbonate (PC) resin; A composite metal oxide containing at least three metals selected from the group consisting of Bi, Cu, Cd, Ca, Co, Mn, Cr, Mg, Fe, Mo, Sn, Sb and Cs and tungsten per 100 parts by weight of the PC resin. -0.5 parts by weight of a first master batch (Master Batch) 10 parts by weight; And 1 part by weight of a second masterbatch containing 0.05-0.15 parts by weight of aluminum particles having a maximum diameter of 1-5 mu m with respect to 100 parts by weight of PC resin.

In the heat-shielding transparent sheet according to the present invention, the first masterbatch and the second masterbatch preferably have a pellet or flake form.

As described above, according to the present invention, a heat block additive (infrared ray blocking agent) and aluminum are sequentially compounded in a master batch form in a master batch in a master batch form and processed to form a desired shape, It is possible to easily provide a PC sheet as much as possible.

Further, the present invention is advantageous in that the use of aluminum particles, which may be harmful to human body, is minimized when used in a large amount, while being transparent in terms of transparency, safe in health, excellent in mining and excellent in shade effect.

In addition, since the infrared ray reflection film or the infrared ray reflection film is not formed on the PC sheet through a separate process, there is no additional cost and the process is shortened.

In addition, the present invention can control the heat shielding and transparency according to the thickness of the PC sheet having transparency independent of the thickness, so that it is possible to flexibly respond to various demands of customers on heat shielding and transparency.

FIG. 1 is a process diagram showing a manufacturing process of a heat-
FIG. 2 is a graph showing a comparison of heat blocking efficiency between a heat-shielding transparent sheet manufactured by the manufacturing method according to the present invention and a general PC sheet,
3 is a graph showing the infrared transmittance of a heat-shielding transparent sheet produced by the manufacturing method according to the present invention and a general PC sheet in comparison with the infrared transmittance.

Hereinafter, embodiments of a heat-shielding transparent sheet and a method of manufacturing the same will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

1, a heat-shielding transparent sheet according to the present invention comprises a PC resin as a base material and a composite metal oxide as a first heat blocker, The first master batch is prepared (Step 110), the PC resin is mixed with aluminum, which is a second heat blocker, to prepare a second master batch (Step 120), and the first and second master batches 2 master batch is mixed with PC resin and processed, and the PC sheet is finally extruded (step 130).

As shown in FIG. 1, the heat-shielding transparent sheet according to the present invention is produced by preparing each of the first heat shielding agent and the second heat shielding agent in a master batch and mixing them with a PC resin to prepare a PC sheet, It is possible to eliminate unexpected chemical reactions of aluminum, to improve dispersion with PC resin, to prevent scattering of metal oxide and aluminum of small particles, and to maintain a safer working environment.

Particularly, by eliminating the chemical reaction of the composite metal oxide and aluminum, the infrared ray occupying most of the heat ray can be effectively separated by the near-infrared ray and the far-infrared ray.

At this time, the shapes of the first and second master batches may be variously formed, such as a pellet type, a plate type, and a flake type, but they may be finally mixed with a PC resin to form a PC It is preferable to manufacture the sheet in the form of fine pellets or flakes having a diameter of 1-10 mm.

The PC resin serves as a substrate and is generally used in the production of a PC sheet and is not particularly limited as long as it is conventionally used in the art. The PC resin can be used in the present invention. The PC resin preferably has a weight average molecular weight of 1,000 to 300,000, or 10,000 to 150,000.

The composite metal oxide used in the production of the first master batch of the heat-shielding transparent sheet according to the present invention is composed of Bi, Cu, Cd, Ca, Co, Mn, Cr, Mg, Fe, Mo, Sn, Sb and Cs And at least three metals selected from tungsten (WO ₃ ). From the combination of the three or more metals selected with tungsten and PC resin, it is possible to more effectively shield light in the near-infrared region wavelength band and transmittance equal to or higher than that in the visible light region.

In addition to the composite metal oxide used for the production of the first master batch and efficiently blocking near infrared rays, the second master batch produced by compounding the aluminum particles in the PC resin can be more efficiently used in the far- And a transmittance equal to or higher than that in the visible light region can be ensured.

The composite metal oxide may be a longest diameter of 1 nm to 100 탆, or a fine particle having a longest diameter of 10 nm to 10 탆. If the maximum diameter of the composite metal compound is too small, the aggregation of the particles easily occurs, and the dispersibility in the resin composition may be greatly lowered. If the maximum diameter of the composite metal compound is too large, the appearance or mechanical properties of the PC resin composition of the embodiment may be lowered or the haze value may be greatly increased.

On the other hand, it is preferable that the size of the aluminum particles used in the production of the second master batch of the heat-shielding transparent sheet according to the present invention is 1-5 μm, in order to improve the far-infrared ray shielding effect and to obtain an excellent visible light transmittance. That is, aluminum particles of 5 占 퐉 or more, which have conventionally been used for infrared ray shielding, have an infrared ray shielding effect, but the visible light transmittance is lowered and a heat shielding effect of a predetermined level or higher can be obtained, but transparency can not be expected.

The heat-shielding transparent sheet according to the present invention may further comprise at least one additive selected from the group consisting of a hindered amine light stabilizer, a releasing agent, an epoxy compound, a heat stabilizer and an antioxidant, A master batch and a second master batch using an easily rustproof aluminum are respectively produced and blended together with the PC resin so that no additional heat stabilizer or antioxidant is added.

Examples of the hindered amine light stabilizers include bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis- (1,2,2,6,6-pentamethyl- 4-piperidyl) sebacate, poly [[6- (1,1,3,3-tetramethylbutyl) amino-1,3,5-triazine- Tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]], N, N'-bis -Aminopropyl) ethylenediamine-2,4-bis [N-butyl-N- (1,2,2,6,6-pentamethyl-4-piperidylamino) -6- Triazine condensate, dibutylamine-1,3,5-triazine-N, N'-bis (2,2,6,6) -tetramethyl-4-piperidyl-1,6-hexamethylene Diamine and N- (2,2,6,6-tetramethyl-4-piperidyl) butylamine, or a mixture of two or more thereof.

The hindered amine light stabilizer may be used in an amount of 0.001 part by weight to 1 part by weight based on 100 parts by weight of the PC resin. By using the hindered amine light stabilizer in the above range, it is possible to improve the weatherability of the sheet without causing deterioration of the mechanical properties of the hindered amine light stabilizer on the surface of the heat-shielding transparent sheet according to the present invention, .

Meanwhile, the heat-shielding transparent sheet according to the present invention may further include a release agent to increase the productivity during extrusion and extrusion and to reduce the defective rate.

Examples of the release agent include higher fatty acid esters of higher fatty acids, mono- or polyhydric alcohols, natural animal waxes such as beeswax, natural plant waxes such as carnauba wax, natural petroleum waxes such as paraffin wax, natural coal waxes such as montan wax , An olefin wax, a silicone oil, an organopolysiloxane, or a mixture of two or more thereof.

Examples of the higher fatty acid esters include substituted or unsubstituted monovalent or polyhydric alcohols having 1 to 20 carbon atoms, and substituted or unsubstituted partial esters or esters of saturated fatty acids having 10 to 30 carbon atoms. Examples of the partial esters or all esters of monohydric or polyhydric alcohols and saturated fatty acids include stearic acid monoglyceride, stearic acid diglyceride, stearic acid triglyceride, stearic acid monosorbate, stearic acid stearate, Propyleneglycol monostearate, stearyl stearate, palmityl palmitate, butyl stearate, methyl lauroyl stearate, isopropyl palmitate, butyl stearate, methyl stearate, Isopropyl palmitate, biphenyl biphenate, sorbitan monostearate, 2-ethylhexyl stearate, ethylene glycol distearate, and the like.

Examples of the higher fatty acids include myristic acid, lauric acid, palmitic acid, stearic acid, behenic acid, and the release agent may be used in an amount of 0.0001 to 0.01 part by weight based on 100 parts by weight of the PC resin .

Meanwhile, the heat-shielding transparent sheet according to the present invention may further include an epoxy compound to further improve the hydrolysis resistance of the molded article to be produced.

Specific examples of the epoxy compound include epoxidized soybean oil, epoxidized linseed oil, phenylglycidyl ether, allyl glycidyl ether, t-butylphenylglycidyl ether, 3,4-epoxycyclohexylmethyl-3 Epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-3 ', 4'-epoxy-6'-methylcyclohexylcarboxylate, 2,3-epoxycyclohexyl Methyl-3 ', 4'-epoxycyclohexylcarboxylate, 4- (3,4-epoxy-5-methylcyclohexyl) butyl-3', 4'-epoxycyclohexylcarboxylate, Cyclohexylmethyl-3,4-epoxycyclohexylcarboxylate, 3,4-epoxy-6-methylcyclohexylmethyl-6'-methylcyclohexylcarboxylate, bisphenol A diglycidyl ether , Tetrabromobisphenol A glycidyl ether, diglycidyl ester of phthalic acid, diglycidyl ester of hexahydrophthalic acid, bis -Epoxy dicyclopentadienyl ether, bis-epoxyethylene glycol, bis-epoxycyclohexyl adipate, butatadienedepoxide, tetraphenylethylene epoxide, octyl epoxidarate, epoxidized polybutadiene, 3,4 Dimethyl-1,2-epoxycyclohexane, 3,5-dimethyl-1,2-epoxycyclohexane, 3-methyl- Dimethyl-3,4-epoxycyclohexylcarboxylate, N-butyl-2,2-dimethyl-3,4-epoxycyclohexylcarboxylate, cyclohexyl- Butyl-2-isopropyl-3,4-epoxy-5-methylcyclohexylcarboxylate, octadecyl-3,4-epoxycyclohexylcarboxylate, 2-ethylhexyl- -Epoxycyclohexylcarboxylate, 4,6-dimethyl-2,3-epoxycyclohexyl-3 ', 4'-epoxycyclohexylcarboxylate, 4,5-epoxy anhydride tetrahydrophthalate , 3-t-butyl-4,5-epoxy anhydrous tetrahydrophthalic acid, diethyl-4,5-epoxy-cis-1,2-cyclohexyldicarboxylate, di- -4,5-epoxy-cis-1,2-cyclohexyldicarboxylate, and the like.

The epoxy compound may be used in an amount of 0.0001 part by weight to 5 parts by weight based on 100 parts by weight of the PC resin. By using the epoxy compound in the above range, the hydrolysis resistance of the molded article can be improved without causing deterioration of the mechanical properties of bleeding of the epoxy compound on the surface of the molded article and various molded articles.

The heat-shielding transparent sheet according to the present invention may further include a heat stabilizer to prevent a decrease in the molecular weight or deterioration of color of the PC resin. Specific examples of the heat stabilizer include phosphorous acid, phosphoric acid, phosphonic acid, phosphonic acid, and esters thereof. Specific examples of the heat stabilizer include triphenylphosphite, tris (nonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tridecylphosphite, trioctylphosphite, trioctadecylphosphite, didecylmonophenylphosphite, dioctylmonophenylphosphite, diisopropylmonophenyl (2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, 2,2-di-tert-butylphenylphenylphosphite, monodecyldiphenylphosphite, monohexyldiphenylphosphite, Bis (2,4-di-tert-butylphenyl) pentaerythritol diphosphite, distearate (bis (2,4-di-tert- butylphenyl) octylphosphite, bis (nonylphenyl) pentaerythritol diphosphite, bis ≪ RTI ID = 0.0 > tributyl But are not limited to, tetrakis (triphenylphosphine), tetrakis (triphenylphosphine), triphenylphosphate, triphenylphosphate, diphenylmonortalkenylphosphate, dibutylphosphate, dioctylphosphate, diisopropylphosphate, 4,4'- , 4-di-tert-butylphenyl), dimethyl benzenephosphonate, diethyl benzenephosphonate, dipropylene benzenephosphate, or a mixture of two or more thereof.

The thermal stabilizer may be used in an amount of 0.0001 part by weight to 1 part by weight based on 100 parts by weight of the PC resin. As the stabilizer is used in the above amount, molecular weight reduction and discoloration of the PC resin can be prevented without causing bleeding of the additive.

Further, the heat-shielding transparent sheet according to the present invention may further include a conventionally known antioxidant.

Specific examples of such antioxidants include pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-laurylthiopropionate), glycerol-3-stearyl thiopropionate, tri Bis [3- (3-tert-butyl-5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3-hydroxyphenyl) propionate, pentaerythritol tetrakis Butyl-4-hydroxyphenyl) propionate, 1,3,5-trimethyl-2,4,6-tris (3,5-di-tert- ) Benzene, N, N-hexamethylenebis (3,5-di-tert-butyl-4-hydroxy-hydrocinnamide), 3,5-di-tert- -Diethyl ester, tris (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanurate , 4,4'-biphenylene diphosphine tetrakis (2,4-di-tert-butylphenyl), 3,9-bis {1,1- -4-hydroxy-5-methylphenyl) propionyloxy] ethyl} -2,4,8,10-tetraoxaspiro (5,5) undecane or a mixture of two or more thereof.

The antioxidant may be used in an amount of 0.0001 part by weight to 1 part by weight based on 100 parts by weight of the PC resin.

Meanwhile, the heat-shielding transparent sheet according to the present invention may further include a polymer resin other than the PC resin for the purpose of further improving and adjusting the molding processability and various physical properties.

Specifically, the heat shielding transparent sheet according to the present invention may further include at least one other polymer resin selected from the group consisting of a polyester resin, a polyether, a polyamide, a polyolefin, and polymethyl methacrylate. The other polymer resin may be further contained in an amount of 1 to 50 parts by weight based on 100 parts by weight of the PC resin.

The heat-shielding transparent sheet according to the present invention is preferably transparent depending on the properties required in the field of use, and transparency of such a sheet is preferably high in total light transmittance in the visible light region. The heat shielding transparent sheet according to the present invention may have visible light transmittance of 50 to 90% at a thickness of 3 mm according to the size and content of aluminum particles, with reference to the optical characteristics shown in Table 1 to be described below.

Referring to FIG. 1, the first master batch is prepared by mixing a PC resin and the above-mentioned composite metal oxide using a blender (Step 111), followed by melt-kneading using a vent type single-screw extruder (Step 113). At this time, the extrusion conditions are 10-25 kg / h of discharge amount, 100-250 rpm of screw revolution, and the extrusion temperature is preferably 250-350 캜. The extruded first master batch is dried at 100-120 ° C for about 3-4 hours using a hot air dryer (Step 115). The mixing ratio of the PC resin and the composite metal oxide is preferably 0.00001-0.5 parts by weight of the composite metal oxide with respect to 100 parts by weight of the PC resin.

The second master batch is prepared by mixing the PC resin and the aluminum particles described above using a blender (Step 121), and then melt-kneading using a vented single-screw extruder (Step 123). At this time, the extrusion conditions are a discharge rate of 15-30 kg / h, a screw rotation rate of 150-300 rpm, and an extrusion temperature of 200-300 캜. The extruded second master batch is dried at 100-120 ° C. for about 2-3 hours using a hot air drier (step 125). The mixing ratio of the PC resin to the aluminum particles is preferably 0.05-0.15 parts by weight of aluminum particles per 100 parts by weight of the PC resin.

The first masterbatch efficiently blocks near-infrared rays and the second masterbatch efficiently blocks far-infrared rays. Therefore, in order to produce a PC sheet having desired transparency and heat shielding degree, first and second The master batch is mixed (Step 131), and melt-kneaded using a vented single-screw extruder (Step 133). The mixing ratio of the PC resin and the first and second master batches is preferably 10 parts by weight and 1 part by weight, respectively, for the first and second master batches relative to 100 parts by weight of the PC resin.

Subsequently, the material melted and kneaded in step 133 is finally extruded into a PC sheet at an extrusion condition discharge rate of 200-500 kg / h, a screw rotation rate of 60-120 rpm, and an extrusion temperature of 200-350 ° C. (step 135).

FIG. 2 is a graph showing the thermal efficiency of the heat shielding transparent sheet manufactured by the manufacturing method according to the present invention and the general PC sheet, and FIG. 3 is a graph showing the heat shielding transparent sheet produced by the manufacturing method according to the present invention, A graph showing the infrared transmittance of the sheet in comparison with the results of measurement of heat shielding efficiency and transmittance under an infrared lamp and sunlight respectively by a heat shielding transparent sheet and a general transparent PC sheet manufactured by the manufacturing method according to the present invention .

Detailed optical properties and temperature changes are summarized in Table 1 below. Referring to FIGS. 2, 3 and 1, in the case of the heat shielding transparent sheet according to the present invention (the blue blue graph in FIGS. 2 and 3), the internal temperature is lowered by 8-11 ° C. And the transmittance is also comparable to the transmittance of the PC sheet (the purple graph of FIGS. 2 and 3) which is simply mixed with the aluminum particles according to the prior art, the first and second master batches It is possible to secure a high degree of transparency of the PC sheet together with a similar degree of heat shielding performance.

As described above, the heat-shielding transparent sheet according to the present invention is a heat-shielding transparent sheet which is obtained by masterbatching a heat blocker and aluminum particles of a composite inorganic compound for infrared ray shielding, While blocking the infrared rays by dividing them into near-infrared rays and far-infrared rays, a high heat shielding effect can be obtained.

In addition, since the heat-shielding transparent sheet according to the present invention uses less expensive aluminum, it is possible to efficiently block the infrared rays of sunlight while harmless to the human body at a low cost.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

Claims (6)

A 1 nm-thick layer containing at least three metals selected from the group consisting of polycarbonate (PC) resin and Bi, Cu, Cd, Ca, Co, Mn, Cr, Mg, Fe, Mo, Sn, Sb and Cs, A composite metal oxide having a longest diameter of 100 mu m is mixed with 0.00001 to 0.5 parts by weight of the composite metal oxide with respect to 100 parts by weight of the PC resin to prepare a first master batch having a pellet or flake form );
0.05 to 0.15 part by weight of aluminum particles having a maximum diameter of 1-5 mu m with respect to 100 parts by weight of PC resin to prepare a second master batch having a pellet or flake form;
10 parts by weight of the first masterbatch and 1 part by weight of the second masterbatch are mixed with 100 parts by weight of the PC resin to prepare a heat block transparent sheet,
The first master batch manufacturing process includes:
Mixing 0.00001-0.5 parts by weight of the composite metal oxide with 100 parts by weight of the PC resin with a blender,
Melting and kneading the mixed PC resin and the composite metal oxide with a vent type single screw extruder and
Extruding the melted and kneaded material at a discharge rate of 10-25 kg / h, a screw rotation rate of 100-250 rpm, an extrusion temperature of 250-350 占 폚, and drying at 100-120 占 폚 for 3-4 hours by a hot-
The second master batch manufacturing process includes:
Mixing 0.05-0.15 parts by weight of aluminum particles having the longest diameter of 1-5 mu m with respect to 100 parts by weight of PC resin with a blender,
Melting and kneading the mixed PC resin and aluminum particles with a vented single screw extruder and
Extruding the molten and kneaded material at a discharge rate of 15-30 kg / h, a screw rotation rate of 150-300 rpm, an extrusion temperature of 200-300 ° C, and drying the mixture at 100-120 ° C for 2-3 hours using a hot air drier,
The process of producing the heat-
Mixing 10 parts by weight of the first masterbatch and 1 part by weight of the second masterbatch with a blender to 100 parts by weight of the PC resin,
Melting and kneading the mixed PC resin, the first and second master batches with a vented single-screw extruder, and
Extruding the molten and kneaded material at a discharge rate of 200-500 kg / h, a screw rotation rate of 60-120 rpm, and an extrusion temperature of 200-350 占 폚. delete delete delete delete delete

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