CN-121986135-A - Plexiglass, method for producing plexiglass, and device for producing plexiglass

Abstract

The invention provides plexiglass with excellent surface abrasion resistance. In addition, a method and an apparatus for producing the plexiglass are provided. The resin glass comprises a substrate exhibiting visible light transmittance and a hard coat layer comprising an organosilicon polymer formed on the upper layer of the substrate, wherein the hard coat layer has a modified region having a higher inorganic glass component ratio on the surface than the surface on the substrate side, and the inorganic glass component ratio in the modified region is 40% -50%.

Inventors

• KIYOMI AKIHIRO

Assignees

• 优志旺电机株式会社

Dates

Publication Date

20260505

Application Date

20240911

Priority Date

20231107

Claims (6)

1. 1. A resin glass comprising a substrate exhibiting visible light transmittance and a hard coat layer comprising a silicone polymer formed on the upper layer of the substrate, The hard coat layer has a modified region having a higher ratio of inorganic glass components on the surface than the substrate-side surface, The ratio of the inorganic glass component in the modified region is 40% -50%.
2. 2. The plexiglass of claim 1, wherein the plexiglass is used in an automotive windshield.
3. 3. The plexiglass according to claim 1 or 2, wherein the thickness of the modified region in a direction orthogonal to the main surface of the substrate is sub-micron.
4. 4. A process for producing a resin glass, comprising the steps of irradiating a hard coat layer comprising an organosilicon polymer formed on a substrate having visible light transmittance with ultraviolet light having a dominant wavelength of 243nm or less, modifying the surface of the hard coat layer to form a modified region, The step of forming the modified region is a step of irradiating the hard coat layer with the ultraviolet light so that the ratio of the inorganic glass component in the modified region is 40% -50%.
5. 5. A resin glass manufacturing apparatus for forming a modified region by irradiating a substrate having a visible light-transmitting property and formed with a hard coat layer containing a silicone polymer with ultraviolet light to modify the surface of the hard coat layer, Comprises a support part for supporting the substrate and a light source for emitting ultraviolet light with a dominant wavelength below 243nm toward the substrate, And the light source irradiates the hard coating with the ultraviolet light at an accumulated light quantity of which the ratio of the inorganic glass component of the modified region reaches 40% -50%.
6. 6. The apparatus for producing plexiglass according to claim 5, wherein the apparatus comprises: a storage unit for storing the cumulative light amount of which the ratio of the inorganic glass component in the modified region is 40% -50%, and And a control unit for controlling the lighting operation of the light source based on the accumulated light amount stored in the storage unit.

Description

Plexiglass, method for producing plexiglass, and device for producing plexiglass Technical Field The present invention relates to plexiglass, a method for producing plexiglass, and an apparatus for producing plexiglass. Background For example, resin glass is used instead of silicate glass as a window material provided in an opening of an automobile or a construction machine. A resin material such as polycarbonate constituting the resin glass is expected to have a light transmittance equivalent to that of silicate glass for visible light. In addition, a resin material such as polycarbonate has advantages of easy molding and excellent heat insulation. However, resin materials such as polycarbonate have a property that the surface is easily damaged. In view of this, a technique is known in which a hard coat layer containing a silicone polymer is formed on a substrate made of the resin material, and ultraviolet light is irradiated to the hard coat layer. For example, as shown in patent document 1, irradiation of ultraviolet light to the hard coat layer modifies the surface of the hard coat layer, thereby improving the abrasion resistance of the surface of the substrate made of the resin material. Prior art literature Patent literature Patent document 1 Japanese patent No. 6434350 Disclosure of Invention Problems to be solved by the invention The present inventors studied to obtain a plexiglass having an improved surface abrasion resistance by forming a hard coating layer containing a silicone polymer on a substrate made of polycarbonate, and modifying the hard coating layer by irradiation with ultraviolet light. As a result, it has been found that although the abrasion resistance of the surface of the plexiglass is improved by modifying the hard coat layer, if the modification of the hard coat layer is excessively performed, the abrasion resistance of the surface is lowered, and a plexiglass excellent in abrasion resistance cannot be obtained. In view of the above, an object of the present invention is to provide plexiglass with excellent wear resistance on the surface. Another object of the present invention is to provide a method and an apparatus for producing the above plexiglass. Means for solving the problems The resin glass of the present invention is characterized by comprising a substrate exhibiting visible light transmittance and a hard coat layer comprising an organosilicon polymer formed on the upper layer of the substrate, wherein the hard coat layer has a modified region having a higher ratio of an inorganic glass component on the surface than the surface on the substrate side, and the ratio of the inorganic glass component in the modified region is 40% -50%. "Exhibiting visible light transmittance" means that the transmittance to visible light is 70% or more, preferably 80% or more, and more preferably 90% or more. In the present specification, the term "silicone polymer" means a polymer having a siloxane bond and having an organic group such as a methyl group, a phenyl group, a vinyl group, or an alkoxy group in a side chain. The hard coat layer has a modified region formed by irradiation of ultraviolet light on the surface. As a result of intensive studies, the present inventors have found that the ratio of inorganic glass components in the modified region is related to the abrasion resistance of plexiglas. In the description of the "specific embodiment", the present inventors found that the above-described composition can be proposed by setting the ratio of the inorganic glass component to 40% to 50% to obtain plexiglass having excellent surface abrasion resistance. As described in detail below, the "ratio of inorganic glass component" is obtained by determining the ratio of inorganic glass component to the sum of organosilicon component and inorganic glass component, which is obtained by analyzing the surface of the hard coat layer by infrared spectroscopic analysis (ATR-FTIR). The resin glass can be used for windshields of automobiles. Conventionally, in windshields of automobiles, it is required that a Δhaze value, which is an index of abrasion resistance, obtained by an abrasion test specified in JIS R3212 (safety glass test method for automobiles) is 2% or less. The Δhaze value is an index represented by the difference between the haze value before the abrasion test and the haze value after the abrasion test, and the higher the abrasion resistance, the smaller the Δhaze value. The haze value is a value obtained by digitizing the degree of diffusion of light transmitted from the sample. In europe and the united states, wear resistance indexes are similarly established for windshields of automobiles. Currently, standards such as ECE R43 are established in europe, and ANSI Z26.1 is established in the united states. In detail, according to the above configuration, a plexiglass with a delta haze value of 2% or less can be obtained. That is, the resin glass is suitable for a windshield of an aut