WO2016099200A1 - Reinforced plastic sheet and method for manufacturing same - Google Patents

Abstract

The present invention relates to a reinforced plastic sheet that can replace a reinforced glass substrate. The present invention provides a reinforced plastic sheet and a method for manufacturing the same, the reinforced plastic sheet being obtained by impregnating a glass fiber with a thiourethane liquid-state resin, which includes a mixture of a polyisocyanate compound and a polythiol compound, and which has a solid-state refractive index of 1.50-1.61, and then curing the same. The reinforced plastic sheet according to the present invention can be used, in place of conventional reinforced glass substrates, as a display or touch screen-type cover window in various fields, such as portable telephones, tablet PCs, laptops, LCD monitors, cameras, etc. In addition, the reinforced plastic sheet according to the present invention can be widely used in fields that require both transparency and strength, including various kinds of electronic products, such as refrigerators, washing machines, TV sets, etc., product cases that require transparency, and various see-through windows attached to helmets or shields.

Description

Reinforced plastic sheet and its manufacturing method

The present invention relates to a reinforced plastic sheet that can replace the tempered glass substrate, in particular, can replace the tempered glass substrate for the cover window used in mobile phones, tablet PCs, notebooks, LCD monitors, etc. It relates to a reinforced plastic sheet and a method of manufacturing the same that can be used as.

Recently, as more electronic products using a touch screen display method are used, tempered glass substrates are widely used for cover windows in mobile phones, tablet PCs, notebook computers, and LCD monitors. In general, a touch screen panel forms a sensing cell on a transparent substrate. In this case, tempered glass is used as a substrate to secure transparency and strength.

Tempered glass substrates, which are used for cover windows, are currently being mass-produced by cutting one sheet of tempered glass substrate into multiple cells that fit the panel size. In this case, a laser etching process, a sand blasting process, or the like is usually used as the cutting method. However, the production method of such a cutting method has problems such as a fine crack problem in the cut surface, difficulty in manufacturing as various shapes such as curved surface. In addition, the tempered glass substrate is widely used in transparency and relatively high strength, but the impact strength is insufficient enough to easily break when falling, there is also a problem that stiffness (stiffness) is weak compared to the general glass, making it difficult to thin. In particular, when making a thin glass substrate with a thickness of 0.3 mm or less, it is difficult to meet the recent demands for light weight and slimness due to instability of the cut surface and lowering of breaking strength.

As such, tempered glass substrates are currently used as materials having both transparency and strength, but have problems and limitations. Accordingly, as the light weight and slimness of display substrates are recently pursued, there is a growing demand for thinner, lighter, higher strength, and free formability substrates that can replace conventional glass substrates.

Plastics and glass fibers, which are synthetic polymer materials, have attracted attention as alternative materials for tempered glass substrates. However, in the case of plastic, there is a problem in that the strength of the glass substrate is not satisfied. Glass fiber is obtained by melting and processing a glass containing silicate as a main component and processing it into a fiber shape, also called glass fiber or glass wool. Glass fiber is very thin, so the specific surface area is very large, light, not eroded by moisture, and has high strength. Due to these characteristics, glass fibers are impregnated with plastic films for the purpose of increasing the tensile strength of plastic films which have a significantly lower tensile strength than glass substrates (Korean Patent Publication No. 10-2010-0118222, 10-2012-0027632, 10-2011-0055425).

However, when the glass film is impregnated with the glass fiber, the transparency of the film is greatly reduced due to the difference in refractive index, and the surface is also rough. Even if the surface roughness is flattened using physical means such as a roller, as described in Korean Patent Application Laid-Open Publication No. 10-2014-0107116, if transparency and transparency are not solved, high transparency such as cover windows and security windows are required. It cannot be used as a substitute for tempered glass substrate in the field.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Republic of Korea Patent Publication No. 10-2013-0092713

(Patent Document 2) Republic of Korea Patent Publication 10-2010-0118222

(Patent Document 3) Korean Unexamined Patent Publication 10-2012-0027632

(Patent Document 4) Republic of Korea Patent Publication No. 10-2011-0055425

(Patent Document 5) Republic of Korea Patent Publication 10-2014-0107116

The present invention is to provide a reinforced plastic sheet and a manufacturing method thereof that can replace the conventional tempered glass substrate used in the cover window. In the present invention, the reinforced plastic sheet, which is obtained by impregnating a glass fiber in a thiourethane resin having a solid refractive index of 1.50 to 1.61, is light, high in strength, thin in thickness, can be mass-produced, and can be freely formed into various shapes including curved shapes. An object of the present invention is to provide a reinforced plastic sheet having high light transmittance and transparency while impregnating glass fibers with resin, and a method of manufacturing the same.

In the present invention,

It comprises a step of obtaining a plastic sheet by impregnating the glass fiber in the thiourethane liquid resin of a solid phase refractive index 1.50 ~ 1.61 containing a polyisocyanate compound and a polythiol compound,

The polyisocyanate compound may be selected from 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane; Xylylene diisocyanate; Hexamethylene diisocyanate; Dicyclohexylmethane-4,4-diisocyanate (H ₁₂ MDI); At least one of 1,3,5-tris (6-isocyanatohexyl) -1,3,5-triazinein-2,4,6-trione (HDI trimer) and isophorone diisocyanate,

The polythiol compound may be selected from the group consisting of 2,3-bis (2-mercaptoethylthio) propane-1-thiol; Pentaerythritol tetrakis (3-mercaptopropionate); Pentaerythritol tetrakis (2-mercaptoacetate); Trimethylolpropane tris (mercaptopropionate); Trimethylolethane tris (mercaptoacetate); Trimethylolpropane tris (mercaptoacetate); Bis (2-mercaptoethyl) 2-hydroxybutane diester; Provided is a method for producing a reinforced plastic sheet, which is at least one of a thiol compound represented by Formula 1 below.

[Formula 1]

In the embodiment of the present invention, the step of obtaining the plastic sheet, impregnated with a layer of glass fiber in a thiourethane liquid resin and then taken out and dried to obtain a hardened material, and then laminated several layers of the hardened material and hardened by elevated temperature Obtain a plastic sheet. In another embodiment, several layers of glass fibers are laminated and impregnated with a thiourethane liquid resin, followed by drying to obtain a temporary hardened product, and then the temporary hardened product is heated to obtain a cured plastic sheet. In another embodiment, the thiouurethane liquid resin is impregnated with several layers of glass fibers and dried to obtain a temporary hardened product, and then the temporary hardened material is heated to obtain a cured plastic sheet.

The method of manufacturing a reinforced plastic sheet of the present invention may further include performing a hard coating on the plastic sheet obtained by curing. In addition, the production method is a urethane (meth) acrylate obtained by reacting an isocyanate having a plurality of isocyanate groups in one molecule with polycaprolactone-modified alkyl (meth) acrylate on the plastic sheet or the hard coating obtained by curing. The method may further include forming a self-healing coating layer by applying and curing the self-healing coating solution including a.

In the present invention,

A reinforced plastic sheet obtained by impregnating a glass fiber in a thiourethane liquid resin containing a polyisocyanate compound and a polythiol compound with a refractive index of 1.50 to 1.61,

The polyisocyanate compound may be selected from 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane; Xylylene diisocyanate; Hexamethylene diisocyanate; Dicyclohexylmethane-4,4-diisocyanate (H ₁₂ MDI); 1,3,5-tris (6-isocyanatohexyl) -1,3,5-triazinein-2,4,6-trione (HDI trimer); And isophorone diisocyanate,

The polythiol compound may be selected from the group consisting of 2,3-bis (2-mercaptoethylthio) propane-1-thiol; Pentaerythritol tetrakis (3-mercaptopropionate); Pentaerythritol tetrakis (2-mercaptoacetate); Trimethylolpropane tris (mercaptopropionate); Trimethylolethane tris (mercaptoacetate); Trimethylolpropane tris (mercaptoacetate); Bis (2-mercaptoethyl) 2-hydroxybutane diester; Provided is a reinforced plastic sheet, which is at least one of a thiol compound represented by Formula 1 below.

The reinforced plastic sheet of the present invention may further include a hard coating layer on the plastic sheet obtained by curing. In addition, the curing may further include a self-healing coating layer on the plastic sheet or hard coating layer obtained.

In addition, the present invention provides a display or touch screen panel including the reinforced plastic sheet of the present invention as a cover window, and a display device including the same. The display device includes a mobile phone, a tablet PC, a notebook computer, an LCD monitor, a camera, and the like.

The reinforced plastic sheet of the present invention has a high light transmittance and transparency while impregnating the glass fiber in the resin, without decreasing the transparency of the plastic resin with a high refractive index and Abbe's number. Compared to the conventional tempered glass substrate, the reinforced plastic sheet of the present invention is light and high in strength, and can be molded into various shapes such as curved shapes and has a merit of mass production. Therefore, the conventional tempered glass substrate can be replaced by a mobile phone, a tablet PC, It can be used as a display or touch screen type cover window in various fields such as laptops, LCD monitors, cameras, etc. In addition, in the fields where transparency and strength are required simultaneously such as various electronic products, cases, and various viewing windows, It can be used in place of material.

In the present invention, the thiourethane resin impregnated with glass fibers is a liquid resin having a solid phase refractive index of 1.50 to 1.61, and includes a polyisocyanate compound and a polythiol compound.

The polyisocyanate compound is preferably 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane; Xylylene diisocyanate; Hexamethylene diisocyanate; At least one of dicyclohexylmethane-4,4-diisocyanate (H ₁₂ MDI) and isophorone diisocyanate. In addition, the polyisocyanate compound may further contain one or more other iso (thio) cyanate compounds, if necessary, and other iso (thio) cyanate compounds may be, for example, 2,2-dimethylpentane diisocyanate. , 2,2,4-trimethylhexanediisocyanate, butene diisocyanate, 1,3-butadiene-1,4-diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, 1,6,11-undectriisocyanate , 1,3,6-hexamethylenetriisocyanate, 1,8-diisocyanate-4-isocyanatomethyloctane, bis (isocyanatoethyl) carbonate, bis (isocyanatoethyl) ether, 1, 2-bis (isocyanatomethyl) cyclohexane, 1,3-bis (isocyanatomethyl) cyclohexane, 1,4-bis (isocyanatomethyl) cyclohexane, cyclohexanediisocyanate, methylcyclo Hexane diisocyanate, dicyclohexyl dimethyl me Carbonisocyanate, 2,2-dimethyldicyclohexyl methane isocyanate, bis (isocyanatobutyl) benzene, bis (isocyanatomethyl) naphthalene, bis (isocyanatomethyl) diphenyl ether, phenylene diisocyanate, Ethylphenylene diisocyanate, isopropylphenylene diisocyanate, dimethylphenylene diisocyanate, diethylphenylene diisocyanate, diisopropylphenylene diisocyanate, trimethylbenzenetriisocyanate, benzenetriisocyanate, biphenyl diisocyanate, toluidine diisocyanate, 4,4 -Diphenylmethane diisocyanate, 3,3-dimethyldiphenylmethane-4,4-diisocyanate, bibenzyl-4,4-diisocyanate, bis (isocyanatophenyl) ethylene, 3,3-dimethoxy ratio Phenyl-4,4-diisocyanate, hexahydrobenzenediisocyanate, hexahydrodiphenylmethane-4,4-diisocyanate Yit, bis (isocyanatoethyl) sulfide, bis (isocyanatopropyl) sulfide, bis (isocyanatohexyl) sulfide, bis (isocyanatomethyl) sulfone, bis (isocyanatoethyl) sulfone Itomethyl) disulfide, bis (isocyanatopropyl) disulfide, bis (isocyanatomethylthio) methane, bis (isocyanatoethylthio) methane, bis (isocyanatoethylthio) ethane, Bis (isocyanatomethylthio) ethane, 1,5-diisocyanato-2-isocyanatomethyl-3-thiapentane, diphenylsulfide-2,4-diisocyanate, diphenylsulfide- 4,4-diisocyanate, 3,3-dimethoxy-4,4-diisocyanatodibenzylthioether, bis (4-isocyanatomethylbenzene) sulfide, 4,4-methoxybenzenethioethylene glycol -3,3-diisocyanate, diphenyldisulfide-4,4-diisocyanate, 2,2-dimethyldiphenyldisulfide-5,5-diisocyanate, 3,3-dimethyldiphenyl Disulfide-5,5-diisocyanate, 3,3-dimethyldiphenyldisulfide-6,6-diisocyanate, 4,4-dimethyldiphenyldisulfide-5,5-diisocyanate, 3,3-dimethoxy Diphenyldisulfide-4,4-diisocyanate, 4,4-dimethoxydiphenyldisulfide-3,3-diisocyanate, 2,5-diisocyanatothiophene, 2,5-bis (isocyanato Methyl) thiophene, 2,5-diisocyanatotetrahydrothiophene, 2,5-bis (isocyanatomethyl) tetrahydrothiophene, 3,4-bis (isocyanatomethyl) tetrahydroti Offen, 2,5-diisocyanato-1,4-dithiane, 2,5-bis (isocyanatomethyl) -1,4-dithiane, 4,5-diisocyanato-1,3 -Dithiorane, 4,5-bis (isocyanatomethyl) -1,3-dithiorane, and 4,5-bis (isocyanatomethyl) -2-methyl-1,3-dithiorane.

The polythiol compound is preferably 2,3-bis (2-mercaptoethylthio) propane-1-thiol; Pentaerythritol tetrakis (3-mercaptopropionate); Pentaerythritol tetrakis (2-mercaptoacetate); Trimethylolpropane tris (mercaptopropionate); Trimethylolethane tris (mercaptoacetate); Trimethylolpropane tris (mercaptoacetate); Bis (2-mercaptoethyl) 2-hydroxybutane diester; At least one of thiol compounds represented by Formula 1 below.

[Formula 1]

In addition, the polythiol compound may further include one or more other polythiol compounds, if necessary. Other polythiol compounds may be, for example, 2,3-bis (2-mercaptoethylthio) -3- Propane-1-thiol, 2,2-bis (mercaptomethyl) -1,3-propanedithiol, bis (2-mercaptoethyl) sulfide, tetrakis (mercaptomethyl) methane; 2- (2-mercaptoethylthio) propane-1,3-dithiol, 2- (2,3-bis (2-mercaptoethylthio) propylthio) ethanethiol, bis (2,3-dimercapto Propaneyl) sulfide, bis (2,3-dimercaptopropanyl) disulfide, 1,2-bis (2-mercaptoethylthio) -3-mercaptopropane, 1,2-bis (2- (2- Mercaptoethylthio) -3-mercaptopropylthio) ethane, bis (2- (2-mercaptoethylthio) -3-mercaptopropyl) sulfide, 2- (2-mercaptoethylthio) -3-2 -Mercapto-3- [3-mercapto-2- (2-mercaptoethylthio) -propylthio] propylthio-propane-1-thiol, 2,2-bis- (3-mercapto-propionyloxy Methyl) -butyl ester, 2- (2-mercaptoethylthio) -3- (2- (2- [3-mercapto-2- (2-mercaptoethylthio) -propylthio] ethylthio) ethylthio Propane-1-thiol, (4R, 11S) -4,11-bis (mercaptomethyl) -3,6,9,12-tetrathiatetradecane-1,14-dithiol, (S) -3- ((R-2,3-dimercaptopropyl) thio) propane-1,2-dithiol, (4 R, 14R) -4,14-bis (mercaptomethyl) -3,6,9,12,15-pentathiaheptan-1,17-dithiol, (S) -3-((R-3-mer Capto-2-((2-mercaptoethyl) thio) propyl) thio) propyl) thio) -2-((2-mercaptoethyl) thio) propane-1-thiol, 3,3'-dithiobis (propane -1,2-dithiol), (7R, 11S) -7,11-bis (mercaptomethyl) -3,6,9,12,15-pentathiaheptadecane-1,17-dithiol, (7R , 12S) -7,12-bis (mercaptomethyl) -3,6,9,10,13,16-hexathiaoctadecane-1,18-dithiol, 5,7-dimercaptomethyl-1, 11-dimercapto-3,6,9-trithiaoundecan, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaoundecan, 4,8-di Mercaptomethyl-1,11-dimercapto-3,6,9-trithiaoundecan, bispentaerythritol-ether-hexakis (3-mercaptopropionate), 1,1,3,3- Tetrakis (mercaptomethylthio) propane, 1,1,2,2-tetrakis (mercaptomethylthio) ethane, 4,6-bis (mercaptomethylthio) -1,3-dithiane and 2- ( 2,2-bis (mercaptodimethylthio) Butyl) -1, 3-dithiane is not like.

In the present invention, the thiourethane liquid resin may further include optional components such as an internal mold release agent, a UV absorber, a dye, a stabilizer, and a bluing agent, as necessary.

As the internal release agent, one or two or more selected from fluorine-based nonionic surfactants, silicone-based nonionic surfactants, alkyl quaternary ammonium salts, and phosphate esters can be used. Preferably acidic phosphate ester is used. As phosphate ester, Isopropyl acid phosphate; Diisopropyl acid phosphate; Butyl phosphate; Octylic acid phosphate; Dioctyl acid phosphate; Isodecyl phosphate; Diisodecyl acid phosphate; Tridecanoic acid phosphate; Bis (tridecanoic acid) phosphate; Nonylphenyl ether phosphate; Zelec UN ™ and the like may be used alone or in combination of two or more thereof. Addition amount of the release agent may be used in 0.001 ~ 10% by weight relative to the total weight of the liquid resin.

As the ultraviolet absorber, a known ultraviolet absorber can be used without limitation. For example, 2- (2'-hydroxy-5-methylphenyl) -2H-benzotriazole; 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chloro-2H-benzotriazole; 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chloro-2H-benzotriazole; 2- (2'-hydroxy-3 ', 5'-di-t-amylphenyl) -2H-benzotriazole; 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -2H-benzotriazole; 2- (2'-hydroxy-5'-t-butylphenyl) -2H-benzotriazole; 2- (2'-hydroxy-5'-t-octylphenyl) -2H-benzotriazole; 2,4-dihydroxybenzophenone; 2-hydroxy-4-methoxybenzophenone; 2-hydroxy-4-octyloxybenzophenone; 4-dodecyloxy-2-hydroxybenzophenone; 4-benzooxy-2-hydroxybenzophenone; 2,2 ', 4,4'-tetrahydroxybenzophenone; 2,2'- dihydroxy-4,4'- dimethoxy benzophenone etc. can be used individually or in mixture of 2 or more types. Preferably, 2- (2'-hydroxy-5'-t-octylphenyl) -2H-benzotriazole or 2 having good ultraviolet absorption in the wavelength range of 400 nm or less and having good solubility in the composition of the present invention; , 2'-dihydroxy-4,4'-dimethoxybenzophenone and the like can be used. The ultraviolet absorber may be added in an amount of 0.005 to 6% by weight (50 to 60,000 ppm), preferably 0.01 to 3% by weight (100 to 30,000 ppm) based on the total weight of the liquid resin.

As the polymerization initiator, an amine-based or tin-based compound can be used. The amount used is preferably 0.001 to 5% by weight based on the total weight of the liquid resin. As the amine compound, triethylamine; Tripropylamine; Dipropylethylamine; Tributylamine; Trihexylamine; Dimethylcyclohexylamine; Dicyclohexylethylamine; Tricyclohexylamine; Diethylcyclohexylamine; Dipropylcyclohexylamine; Dicyclohexylpropylamine; Dibutylcyclohexylamine; Dicyclohexylbutynamine; N, N-dimethylbenzylamine; N, N-diethylbenzylamine; N, N-dipropylbenzylamine; N, N-dibutylbenzylamine; N-methylbenzylamine; 2-dimethylaminomethylphenol; 2,4,6-tris (N, N-dimethylaminomethyl) phenol; Triethylenediamine; Tetramethylethylenediamine; Tetraethylethylenediamine; N, N-dimethylcyclohexylamine; N, N-dicyclohexylmethylamine; Tetrapropylethylenediamine; Tetrabutylethylenediamine; Pentamethyldiethylenetriamine; Pentaethyldiethylenetriamine; Pentapropyldiethylenetriamine; Pentabutyldiethylenetriamine; N-methylpiperidine; N-ethylpiperidine; N-propylpiperidine; N-butyl piperidine; N, N-dimethylpiperazine; N, N-diethylpiperazine; N, N-dipropylpyrazine; N, N-dibutylpiperazine; Hexamethylenetetramine; Dimethylaminoethyl acetate; Diethylaminoethyl acetate; Dimethylaminopropionitrile; Diethylaminopropionitrile; N-methylmorpholine; N-ethyl morpholine; N-propylmorpholine; N-butylmorpholine; N-cyclohexylmorpholine; N-methylpiperidone; N-ethylpiperidone; N-propylpiperidone; N-butyl piperidone; N-methylpyrrolidine; N-ethylpyrrolidine; N-propylpyrrolidine; N-butylpyrrolidine; N-methylpyrrolidone; N-ethylpyrrolidone; N-propylpyrrolidone and N-butylpyrrolidone. Examples of aromatic tertiary amines include N, N-dimethylaniline; N, N-diethylaniline; N, N-dipropylaniline; N, N-dibutylaniline; N, N-cyclohexylmethylaniline; N, N-dicyclohexyl aniline; Diphenylmethylamine; Diphenylethylamine; Triphenylamine; N, N-dimethyltoluidine; N, N-diethyltoluidine; N-cyclohexyl-N-methyltoluidine; N, N-dicyclohexyl toluidine; N, N-dimethylnaphthylamine; N, N-diethylnaphthylamine; N, N-dimethylanisidine; N, N-diethylanisidine and N, N, N ', N'-tetramethylphenylenediamine. Moreover, pyridine; Picoline; Dimethylpyridine; 2,2'-bipyridine; 4,4'-bipyridine; Pyradine; N-methylpyrazole; N-ethylpyrazole; N-propylpyrazole; N-butylpyrazole; N-cyclosecsilpyrazole; Pyridazine; Pyrimidine; Pyrinoline; Oxazole; Thiazole; 1-methylimidazole; 1-benzylimidazole; 1-methyl-2-methylimidazole; 1-benzyl-2-methylimidazole; 1-ethyl-4-methylimidazole; 1-ethyl-2-ethyl-4-methylol; N-methylpyrrole; N-ethylpyrrole; N-butylpyrrole; N-methylpyrroline; N-ethylpyrroline; N-butylpyrroline; Pyrimidine; Furin; Quinoline; Isoquinoline; N-methylcarbazole; N-ethylcarbazole; N-butylcarbazole and the like can be used. As said tin type compound, Butyl tin dilaurate; Dibutyl tin dichloride; Dibutyl tin diacetate; Stannous octylic acid; Dibutyl dilaurate; Tetrafluorotin; Tetrachlorotin; Tetrabromotin; Tetraiodine tin; Methyl tin trichloride; Butyltin trichloride; Dimethyltin dichloride; Dibutyltin dichloride; Trimethyltin chloride; Tributyltin chloride; Triphenyltin chloride; Dibutyltin sulfide; Di (2-ethylsecyl) tin oxide and the like may be used alone or in combination of two or more thereof.

The thiourethane resin containing the polyisocyanate compound and the polythiol compound is preferably a solid phase refractive index of 1.50 to 1.61, and glass fibers are impregnated in a liquid resin state.

Glass fiber (glass fiber) is a glass-fiber processing of silicate-based glass in the form of a fiber, also called glass wool (glass wool).

In one embodiment of the present invention, the thiouurethane liquid resin is impregnated with a layer of fibrous glass fiber intersected by the seed line and the blade line and then taken out and dried. At this time, some curing is done in the drying process to obtain a temporary hardened product. After drying, several layers of temporary hardened | cured material are laminated | stacked, and it pressurizes and heats up to obtain the fully hardened sheet-like reinforced plastic sheet.

In another embodiment of the present invention, several layers of glass fibers are impregnated with thiourethane liquid resin. At this time, it may be impregnated in a stacked state, or may be laminated in several layers while impregnated. After impregnation it is taken out in this laminated state and dried to obtain a temporary hardened product, which is then pressurized and heated to obtain a fully cured sheet of reinforced plastic sheet.

In another embodiment of the present invention, the thiouurethane liquid resin is impregnated with a plurality of layers of glass fibers, and then taken out and dried to obtain a temporary hardened product. The weaving can be made in various forms as with normal fibers. In one embodiment of the present invention was used woven in a lattice pattern. The obtained hardened | cured material is heated up under pressure and the hardened plastic sheet is obtained.

The process of drying after the impregnation is not particularly limited in conditions, and can be performed at room temperature or below room temperature as necessary. However, preferably it may be made for 1 to 200 minutes at 40 ~ 100 ℃.

The pressurized temperature increase of the hardened | cured material may be made 50-250 degreeC at 1,00-100,000 psi preferably.

The reinforced plastic sheet obtained according to the present invention preferably has an Abbe number of 40 or more and more preferably 45 or more.

In one embodiment of the present invention, by hard coating on the reinforced plastic sheet obtained as described above, it is possible to obtain a reinforced plastic sheet containing a hard coating layer. Hard coating can be on one or both sides of the plastic sheet. Hard coating is conventionally made in the field of spectacle lenses to improve the surface hardness of the plastic lens, in the present invention 'hard coating' has the same meaning as the hard coating in the field of spectacle lenses. Hard coating in the present invention can be carried out by a known coating method using a known hard coating solution used for spectacle lenses. For example, a hard coating solution known in the art may be a hard coating solution containing a silicone resin as a main component. Specifically, D50 ™ and D250 ™ manufactured by Dimension, France; TS56 ™ from Tokuyama, Japan; KMC03 ™ from Sumidomo, Japan; FINE COAT's ST11TN-6H ™, ST11TN-8H ™, ST11MP, ST11MS, ST11HI, ST11GN-158, ST11TN-158, ST11GN-161, ST11TN-161; VH-56 (MS) ™ from DON CO., LTD, VH-10 (8H), VH-56 (M), VH-56 (AP), VH-56 (T2), VH-60 (H) , VH-60 (H-T1), KH-60 (H) and the like can be used. As the coating method, coating methods such as dipping, spraying, thermal transfer, and spin coating are all available.

In addition, in an embodiment of the present invention, by applying a self-healing coating on the reinforced plastic sheet or hard coating layer obtained as described above, it is possible to obtain a reinforced plastic sheet containing a self-healing coating layer. Preferably, the self-healing coating may be on either or both sides of the reinforced plastic sheet or hardcoat layer.

Preferably, prior to the self-healing coating, a surface treatment is first performed to increase the surface polarity (wetting) of the plastic sheet or the hard coating layer or to enlarge the specific surface area of the surface. The surface treatment may be performed by, for example, plasma, corona, ion beam, or the like, but is not limited thereto, and increases the polarity (wetting) of the surface or enlarges the specific surface area of the surface with the self-healing coating layer. It is possible to use both surface treatment surface which can improve adhesive strength.

The self-healing coating may form a self-healing coating layer by applying a self-healing coating solution and curing the coating. The self-healing coating solution contains a urethane (meth) acrylate obtained by reacting an isocyanate having a plurality of isocyanate groups in one molecule with polycaprolactone modified alkyl (meth) acrylate. The urethane (meth) acrylate is disclosed in Korean Unexamined Patent Publication No. 10-2004-0088049. The self-healing coating solution may include two or more types of urethane (meth) acrylates having different repeating numbers of caprolactone units per one residue of the polycaprolactone modified alkyl (meth) acrylate. In addition, the self-healing coating solution may include a urethane (meth) acrylate obtained by reacting the isocyanate with two or more kinds of polycaprolactone-modified alkyl (meth) acrylates having different repeating numbers of caprolactone units per molecule. . In addition, the self-healing coating solution is a hydroxyalkyl (meth) isocyanate having a plurality of isocyanate groups in one molecule together with the urethane (meth) acrylate obtained by reacting the isocyanate with polycaprolactone modified alkyl (meth) acrylate Urethane (meth) acrylate obtained by making an acrylate react can be included. In addition, the self-healing coating solution may include a urethane (meth) acrylate obtained by reacting the isocyanate with polycaprolactone modified alkyl (meth) acrylate and hydroxyalkyl (meth) acrylate. In addition, a long chain alcohol may be added to the urethane (meth) acrylate synthesis reaction.

The reinforced plastic sheet obtained according to the present invention can be used as a cover window of a display or a touch screen panel in various display devices such as mobile phones, tablet PCs, notebook computers, LCD monitors, cameras, and the like. In addition, the present invention may be used in fields requiring transparency and strength at the same time, such as various electronic products such as refrigerators, washing machines, TVs, product cases requiring transparency, and various viewing windows attached to helmets or shields.

[ Example ]

Hereinafter, the present invention will be described in detail by way of examples. However, these examples are only for illustrating the present invention in more detail, the scope of the present invention is not limited by these examples.

Test and evaluation method

Measuring the physical properties of the optical lens manufactured by the following physical property test method and the results are shown in Table 1 below.

1) Refractive index (nd and nE) and Abbe number: It was measured at 20 ° C. using an Abbe refractometer, an IT and DR-M4 model of Atago.

2) Transmittance: Measured using a spectrophotometer of Model UV-2450 manufactured by SHIMADZU.

3) Impact Resistance: Impact resistance was tested using a US Instron Model Mini-Tower Impact Tester (Instron dynatub) at 22 ° C. on a 0.8 mm thick flat specimen.

4) Haze (%): Planar specimens with thickness 0.8 mm were collected from Hunter Lab. It was measured using ColorQuest XE.

5) Yellowness index (Y.I.): Measured using a model UV-2450 manufactured by SHIMADZU.

[ Example  One]

0.2 mole of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) 0.1 mol, dibutyltin dichloride 0.05g, 1.2 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole as ultraviolet absorber, 0.1g of nonylphenyl ether phosphate as a release agent and stirred The resin was impregnated with 1.56 glass fibers having similar refractive indices and then temporarily cured at 70 ° C. for 20 minutes. Then, the temporary cured material was overlapped in the longitudinal and transverse directions, and then fully cured by pressing at 120 ° C. at 3000 psi pressure to obtain a 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  2]

0.30 mol of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) 0.12 mol, 2,3-bis (2-mercaptoethylthio) propane-1-thiol (GST) 0.04 mol, dibutyltin dichloride 0.06 g, 2- (2-hydroxy-5 as ultraviolet absorber 1.4 g of octylphenyl) benzotriazole and 0.11 g of nonylphenyl ether phosphate as a releasing agent were added and stirred to impregnate the glass resin having a refractive index of 1.56 having a similar refractive index, followed by curing at 70 ° C. for 50 minutes. . Then, the temporary cured material was overlapped in the longitudinal and transverse directions, and then fully cured by pressing at 120 ° C. at 3000 psi pressure to obtain a 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  3]

0.2 mole of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) 0.1 mol, dibutyltin dichloride 0.05g, 1.2 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole as ultraviolet absorber, 0.1g of nonylphenyl ether phosphate as a release agent and stirred The resin was impregnated with a lattice of glass fibers having a similar refractive index of 1.56 and then cured at 70 ° C. for 30 minutes. The cured material was then fully cured by pressing at 120 ° C. at 3000 psi pressure to obtain 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  4]

0.05 moles of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, 0.15 moles of isopron diisocyanate (IPDI), hexamethylene di 0.10 mol of isocyanates (HDI), 0.12 mol of pentaerythritol tetrakis (3-mercaptopropionate) (PETMP), 0.04 mol of 2,3-bis (2-mercaptoethylthio) propane-1-thiol (GST) , 0.06 g of dibutyltin dichloride, 1.4 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole as a ultraviolet absorber, and 0.11 g of nonylphenyl ether phosphate as a release agent were added to the liquid resin obtained by stirring. A similar 1.56 glass fiber was impregnated and cured at 70 ° C. for 20 minutes. Then, the temporary cured material was overlapped in the longitudinal and transverse directions, and then fully cured by pressing at 120 ° C. at 3000 psi pressure to obtain a 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  5]

0.13 mol of isopron diisocyanate (IPDI), 0.10 mol of hexamethylene diisocyanate (HDI) under nitrogen stream, 0.07 mol of 4,4'-diisocyanatodicyclohexylmethane (H12MDI), pentaerythritol tetrakis (3- Mercaptopropionate) (PETMP) 0.12 mol, 2,3-bis (2-mercaptoethylthio) propane-1-thiol (GST) 0.04 mol, dibutyltin dichloride 0.06 g, 2- (with ultraviolet absorber 1.4 g of 2-hydroxy-5-octylphenyl) benzotriazole and 0.11 g of nonylphenyl ether phosphate as a releasing agent were added and stirred to impregnate 1.56 glass fiber having a similar refractive index to 70 ° C., It was temporarily hardened for 10 minutes. Then, the temporary cured material was laminated in the longitudinal and transverse directions, and then fully cured by pressing at 120 ° C. at a pressure of 7000 psi to obtain a 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  6]

0.15 mol of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, 0.15 mol of isopron diisocyanate (IPDI), bis (2 Mercaptoethyl) 2-hydroxybutane diester 0.16 mol, 2,3-bis (2-mercaptoethylthio) propane-1-thiol (GST) 0.04 mol, dibutyltin dichloride 0.06 g, with ultraviolet absorber 1.4 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole and 0.11 g of nonylphenyl ether phosphate as a release agent were added to the liquid resin, followed by stirring. This was temporarily cured at 70 ° C. for 30 minutes. This temporary hardened material was then fully cured by pressing at 120 ° C. at 7000 psi pressure. 0.8 mm plate-shaped high strength resin was obtained. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  7]

0.2 mole of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) 0.1 mol, dibutyltin dichloride 0.05g, 1.2 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole as ultraviolet absorber, 0.1g of nonylphenyl ether phosphate as a release agent and stirred The resin was impregnated with a glass fiber of 1.56 having a similar refractive index, and then temporarily cured at 70 ° C. for 10 minutes. Then, the temporary cured material was laminated in the longitudinal and transverse directions, and then fully cured by pressing at 120 ° C. at a pressure of 7000 psi to obtain a 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  8]

0.3 mol of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, 0.2 mol of trimethylolpropane trismercaptopropioester (TMPTP) The refractive index was added to 0.05 g of dibutyltin dichloride, 1.2 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole as a UV absorber, and 0.1 g of nonylphenyl ether phosphate as a releasing agent, followed by stirring. A similar 1.56 glass fiber was impregnated and temporarily cured at 70 ° C. for 30 minutes. The cured material was then fully cured by pressing at 120 ° C. at 7000 psi pressure. 0.8 mm plate-shaped high strength resin was obtained. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

[ Example  9]

0.3 mol of 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane (NBDI) under nitrogen stream, 0.2 mol of trimethylolpropane trismercaptoacetate (TMPTG), di 0.05 g of butyltin dichloride, 1.2 g of 2- (2-hydroxy-5-octylphenyl) benzotriazole as a UV absorber, and 0.1 g of nonylphenyl ether phosphate as a releasing agent were added to the liquid resin. It was impregnated with glass fiber of 70 ℃, it was temporarily cured for 10 minutes. Then, the temporary cured material was laminated in the longitudinal and transverse directions, and then fully cured by pressing at 120 ° C. at a pressure of 7000 psi to obtain a 0.8 mm plate-shaped high strength resin. This was cut to 100 × 150 mm to prepare a specimen, and the physical properties thereof were measured. The results are shown in Table 1.

The reinforced plastic sheet of the present invention may be used as a display or touch screen cover window in various fields such as a mobile phone, a tablet PC, a notebook, an LCD monitor, a camera, and replace the conventional tempered glass substrate. Various electronic products such as TVs, product cases requiring transparency, and various viewing windows attached to helmets or shields may be widely used in place of conventional materials in areas requiring transparency and strength at the same time.

Claims (25)

1. It comprises a step of obtaining a plastic sheet by impregnating the glass fiber in the thiourethane liquid resin of a solid phase refractive index 1.50 ~ 1.61 containing a polyisocyanate compound and a polythiol compound,

   The polyisocyanate compound may be selected from 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane; Xylylene diisocyanate; Hexamethylene diisocyanate; Dicyclohexylmethane-4,4-diisocyanate (H ₁₂ MDI); At least one of 1,3,5-tris (6-isocyanatohexyl) -1,3,5-triazinein-2,4,6-trione (HDI trimer) and isophorone diisocyanate,

   The polythiol compound may be selected from the group consisting of 2,3-bis (2-mercaptoethylthio) propane-1-thiol; Pentaerythritol tetrakis (3-mercaptopropionate); Pentaerythritol tetrakis (2-mercaptoacetate); Trimethylolpropane tris (mercaptopropionate); Trimethylolethane tris (mercaptoacetate); Trimethylolpropane tris (mercaptoacetate); Bis (2-mercaptoethyl) 2-hydroxybutane diester; Method for producing a reinforced plastic sheet of any one or more of the thiol compound represented by the formula (1).

   [Formula 1]

   
2. The method of claim 1, wherein the obtaining of the plastic sheet comprises impregnating a layer of glass fiber in a thiourethane liquid resin, and then removing and drying the resultant to obtain a hardened product. A method for producing a reinforced plastic sheet, comprising obtaining a sheet.
3. The method of claim 1, wherein the obtaining of the cured plastic sheet comprises stacking impregnated with several layers of glass fibers in a thiourethane liquid resin, followed by drying to obtain a hardened product, and then pressing the temperature of the hardened product to a hardened plastic sheet. Method of producing a reinforced plastic sheet, characterized in that obtaining.
4. The method of claim 1, wherein the step of obtaining the cured plastic sheet comprises impregnating a woven fabric of thiourethane liquid resin in several layers and then drying to obtain a hardened product. A method for producing a reinforced plastic sheet, comprising obtaining a plastic sheet.
5. The method according to any one of claims 1 to 3, wherein the drying is performed for 1 to 200 minutes at 40 to 100 ° C.
6. The method of manufacturing a reinforced plastic sheet according to any one of claims 1 to 3, wherein the pressurized temperature rise of the hardened material is 50 to 250 ° C at 100 to 100,000 psi.
7. The method of claim 1, further comprising hard coating the plastic sheet obtained by curing.
8. The self-healing comprising a urethane (meth) acrylate obtained by reacting an isocyanate having a plurality of isocyanate groups in one molecule with a polycaprolactone modified alkyl (meth) acrylate on the plastic sheet obtained by curing the resin sheet. Method of producing a reinforced plastic sheet further comprising the step of applying a coating solution and curing to form a self-healing coating layer.
9. The self-healing coating liquid comprising urethane (meth) acrylate obtained by reacting an isocyanate having a plurality of isocyanate groups in one molecule with polycaprolactone modified alkyl (meth) acrylate on the hard coating. After curing to form a self-healing coating layer further comprising the step of producing a reinforced plastic sheet.
10. The method for producing a reinforced plastic sheet according to any one of claims 1 to 4, wherein an Abbe number of the manufactured reinforced plastic sheet is 40 or more.
11. The method of manufacturing a reinforced plastic sheet according to any one of claims 1 to 4, wherein the thiourethane liquid resin further comprises a phosphate ester compound as an internal mold release agent.
12. The polyisocyanate compound according to any one of claims 1 to 4, wherein the polyisocyanate compound is 2,2-dimethylpentane diisocyanate, 1,3,5-tris (6-isocyanatohexyl) -1,3,5 Triazineine-2,4,6-tree one (HDI trimer), 2,2,4-trimethylhexanediisocyanate, butene diisocyanate, 1,3-butadiene-1,4-diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, 1,6,11-undectriisocyanate, 1,3,6-hexamethylenetriisocyanate, 1,8-diisocyanate-4-isocyanatomethyloctane, bis (isocyanatoethyl) carbonate, bis (isocyanatoethyl) ether, 1,2 -Bis (isocyanatomethyl) cyclohexane, 1,3-bis (isocyanatomethyl) cyclohexane, 1,4-bis (isocyanatomethyl) cyclohexane, cyclohexanediisocyanate, methylcyclohexane Diisocyanate, dicyclohexyldimethylmethane isocyanate, 2,2-dimethyldicyclohexylmethane isocyanate, bis (isocyanatobutyl) benzene, bis (isocyanatomethyl) naphthalene, bis (isocyanatomethyl) di Phenyl ether, phenylene diisocyanate, Ethylphenylene diisocyanate, isopropylphenylene diisocyanate, dimethylphenylene diisocyanate, diethylphenylene diisocyanate, diisopropylphenylene diisocyanate, trimethylbenzenetriisocyanate, benzenetriisocyanate, biphenyl diisocyanate, toluidine diisocyanate, 4,4 -Diphenylmethane diisocyanate, 3,3-dimethyldiphenylmethane-4,4-diisocyanate, bibenzyl-4,4-diisocyanate, bis (isocyanatophenyl) ethylene, 3,3-dimethoxy ratio Phenyl-4,4-diisocyanate, hexahydrobenzenediisocyanate, hexahydrodiphenylmethane-4,4-diisocyanate, bis (isocyanatoethyl) sulfide, bis (isocyanatopropyl) sulfide, Bis (isocyanatohexyl) sulfide, bis (isocyanatomethyl) sulfone, bis (isocyanatomethyl) disulfide, bis (isocyanayl) Topropyl) disulfide, bis (isocyanatomethylthio) methane, bis (isocyanatoethylthio) methane, bis (isocyanatoethylthio) ethane, bis (isocyanatomethylthio) ethane, 1,5-Diisocyanato-2-isocyanatomethyl-3-thiapentane, diphenylsulfide-2,4-diisocyanate, diphenylsulfide-4,4-diisocyanate, 3,3- Dimethoxy-4,4-diisocyanatodibenzylthioether, bis (4-isocyanatomethylbenzene) sulfide, 4,4-methoxybenzenethioethylene glycol-3,3-diisocyanate, diphenyldisulfate Feed-4,4-diisocyanate, 2,2-dimethyldiphenyldisulfide-5,5-diisocyanate, 3,3-dimethyldiphenyldisulfide-5,5-diisocyanate, 3,3-dimethyldiphenyl Disulfide-6,6-diisocyanate, 4,4-dimethyldiphenyldisulfide-5,5-diisocyanate, 3,3-dimethoxy diphenyldisulfide-4,4-diisocyanate, 4,4-di Methoxydiphenyl Disulfide-3,3-diisocyanate, 2,5-diisocyanatothiophene, 2,5-bis (isocyanatomethyl) thiophene, 2,5-diisocyanatotetrahydrothiophene, 2, 5-bis (isocyanatomethyl) tetrahydrothiophene, 3,4-bis (isocyanatomethyl) tetrahydrothiophene, 2,5-diisocyanato-1,4-dithiane, 2, 5-bis (isocyanatomethyl) -1,4-dithiane, 4,5-diisocyanato-1,3-dithiolan, 4,5-bis (isocyanatomethyl) -1,3 -Further comprising at least one iso (thio) cyanate compound selected from the group consisting of dithiolane and 4,5-bis (isocyanatomethyl) -2-methyl-1,3-dithiolane Method for producing a reinforced plastic sheet to be.
13. The polythiol compound according to any one of claims 1 to 4, wherein the polythiol compound is 2,3-bis (2-mercaptoethylthio) -3-propane-1-thiol or 2,2-bis (mercapto). Methyl) -1,3-propanedithiol, bis (2-mercaptoethyl) sulfide, tetrakis (mercaptomethyl) methane; 2- (2-mercaptoethylthio) propane-1,3-dithiol, 2- (2,3-bis (2-mercaptoethylthio) propylthio) ethanethiol, bis (2,3-dimercapto Propaneyl) sulfide, bis (2,3-dimercaptopropanyl) disulfide, 1,2-bis (2-mercaptoethylthio) -3-mercaptopropane, 1,2-bis (2- (2- Mercaptoethylthio) -3-mercaptopropylthio) ethane, bis (2- (2-mercaptoethylthio) -3-mercaptopropyl) sulfide, 2- (2-mercaptoethylthio) -3-2 -Mercapto-3- [3-mercapto-2- (2-mercaptoethylthio) -propylthio] propylthio-propane-1-thiol, 2,2-bis- (3-mercapto-propionyloxy Methyl) -butyl ester, 2- (2-mercaptoethylthio) -3- (2- (2- [3-mercapto-2- (2-mercaptoethylthio) -propylthio] ethylthio) ethylthio Propane-1-thiol, (4R, 11S) -4,11-bis (mercaptomethyl) -3,6,9,12-tetrathiatetradecane-1,14-dithiol, (S) -3- ((R-2,3-dimercaptopropyl) thio) propane-1,2-dithiol, (4 R, 14R) -4,14-bis (mercaptomethyl) -3,6,9,12,15-pentathiaheptan-1,17-dithiol, (S) -3-((R-3-mer Capto-2-((2-mercaptoethyl) thio) propyl) thio) propyl) thio) -2-((2-mercaptoethyl) thio) propane-1-thiol, 3,3'-dithiobis (propane -1,2-dithiol), (7R, 11S) -7,11-bis (mercaptomethyl) -3,6,9,12,15-pentathiaheptadecane-1,17-dithiol, (7R , 12S) -7,12-bis (mercaptomethyl) -3,6,9,10,13,16-hexathiaoctadecane-1,18-dithiol, 5,7-dimercaptomethyl-1, 11-dimercapto-3,6,9-trithiaoundecan, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaoundecan, 4,8-di Mercaptomethyl-1,11-dimercapto-3,6,9-trithiaoundecan, bispentaerythritol-ether-hexakis (3-mercaptopropionate), 1,1,3,3- Tetrakis (mercaptomethylthio) propane, 1,1,2,2-tetrakis (mercaptomethylthio) ethane, 4,6-bis (mercaptomethylthio) -1,3-dithiane and 2- ( 2,2-bis (mercaptodimethylthio) Butyl) The process for producing a l, 3-dithiol reinforced, characterized in that it comprises at least one compound selected from the group consisting in more plastic sheets.
14. A reinforced plastic sheet obtained by impregnating a glass fiber in a thiourethane liquid resin containing a polyisocyanate compound and a polythiol compound with a refractive index of 1.50 to 1.61,

    The polyisocyanate compound may be selected from 2,5 (2,6) -bis (isocyanatomethyl) bicyclo [2,2,1] heptane; Xylylene diisocyanate; Hexamethylene diisocyanate; Dicyclohexylmethane-4,4-diisocyanate (H ₁₂ MDI); 1,3,5-tris (6-isocyanatohexyl) -1,3,5-triazinein-2,4,6-trione (HDI trimer); And isophorone diisocyanate,

    The polythiol compound may be selected from the group consisting of 2,3-bis (2-mercaptoethylthio) propane-1-thiol; Pentaerythritol tetrakis (3-mercaptopropionate); Pentaerythritol tetrakis (2-mercaptoacetate); Trimethylolpropane tris (mercaptopropionate); Trimethylolethane tris (mercaptoacetate); Trimethylolpropane tris (mercaptoacetate); Bis (2-mercaptoethyl) 2-hydroxybutane diester; Reinforced plastic sheet is any one or more of the thiol compound represented by the formula (1) below.

    [Formula 1]

    
15. 15. The reinforced plastic sheet according to claim 14, wherein the hardened plastic sheet further comprises a hard coat layer thereon.
16. 15. The reinforced plastic sheet according to claim 14, further comprising a self-healing coating layer on the cured plastic sheet.
17. 16. The reinforced plastic sheet according to claim 15, further comprising a self-healing coating layer on the hard coat layer.
18. 18. The reinforced plastic sheet according to any one of claims 14 to 17, wherein the Abbe number is 40 or more.
19. A display comprising the reinforced plastic sheet of claim 14 as a cover window.
20. A touch screen panel comprising the reinforced plastic sheet of any one of claims 14 to 17 as a cover window.
21. 20. A display device comprising the display of claim 19 or the touch screen panel of claim 20.
22. The display apparatus of claim 21, wherein the display apparatus is any one of a mobile phone, a tablet PC, a notebook computer, an LCD monitor, and a camera.
23. An electronic product comprising as an interior or exterior material made of the reinforced plastic sheet according to any one of claims 14 to 17.
24. 18. A product case comprising the reinforced plastic sheet of any of claims 14-17.
25. 18. An article comprising a viewing window comprised of the reinforced plastic sheet of any of claims 14-17.