PC glass, preparation method thereof and anti-radiation large-window glove box

Abstract

The invention belongs to the technical field of nuclear industry, and particularly relates to PC glass, a preparation method thereof and an anti-radiation large-window glove box. Nano barium sulfate and nano silicon dioxide are added into the PC glass, and a coating is formed on the surface of the PC glass due to the use of an alkoxy silane cross-linking agent and an alkoxy silane chain extender. Under the condition that the performance of radiation shielding, safety and the like of the glove box still meet the requirements, the visual range of a glove box operator is greatly enlarged, the yellowing phenomenon of the squint window under the long-term radiation condition is improved, the operator can observe operation in the glove box conveniently, and the misoperation rate of the operator is greatly reduced.

Description

Technical Field

[0001] This application belongs to the technical field of nuclear industry, and specifically relates to a PC glass, a preparation method thereof, and a radiation-proof large-view glove box. Background Art

[0002] Polycarbonate (PC) is an almost colorless glassy amorphous polymer with good optical properties, high toughness, high impact resistance, and good heat resistance, and is widely used in fields such as glass assembly industry, automotive industry, and electronics and electrical industries. At present, in order to meet the requirements of strong radiation shielding ability, good mechanical properties, safety and reliability, etc., the viewing windows of glove boxes used in the nuclear industry all adopt a three-layer design. From the inside to the outside, they are PC, lead glass, and tempered glass in sequence. Among them, PC has good mechanical properties such as good tensile ductility and is not easy to break, lead glass has good radiation shielding performance, and tempered glass can well protect the lead glass. In the design of glove boxes, due to the limitation of the mechanical properties of the inner layer glass PC material, the viewing windows all adopt a design with a relatively small occupied area. However, this kind of glove box with a small visualization area often causes inconvenience to the operator due to the small observable range of the observer, and may even lead to misoperation in serious cases, resulting in economic losses. Summary of the Invention

[0003] The purpose of this application is to provide a PC glass, a preparation method thereof, and a radiation-proof large-view glove box, so as to solve the problem that in the prior art, the glove box often causes inconvenience to the operator due to the small observable range of the observer, and may even lead to misoperation in serious cases.

[0004] Technical solutions for achieving the purpose of this application:

[0005] In the first aspect of the embodiments of this application, a PC glass is provided. Nano-barium sulfate and nano-silica are added to the PC glass, and a coating is formed on its surface due to the use of an alkoxysilane crosslinking agent and an alkoxysilane chain extender.

[0006] Optionally, the alkoxysilane chain extender is dimethyldimethoxysilane, and the alkoxysilane crosslinking agent is methyltrimethoxysilane.

[0007] In the second aspect of the embodiments of this application, a method for preparing a PC glass is provided, which is used to prepare any one of the PC glasses provided in the first aspect of the embodiments of this application; the method includes:

[0008] Step 1: Mixing materials: Add PC particles, nano-barium sulfate, and nano-silica into a high-speed stirring mixer to mix the materials to obtain a solid plastic;

[0009] Step 2: Extrusion: It is divided into two stages. The first stage is to plasticize the solid plastic and make it pass through the die under pressure to become a continuous body. The second stage is to make the extruded continuous body lose its plastic state and become a solid, thus obtaining the required product;

[0010] Step 3: Pelletizing: The PC formed by extrusion molding is crushed by a powerful crusher for use in injection molding;

[0011] Step 4: Injection molding: Inject the crushed PC pellets, and finally demold to obtain the PC matrix material;

[0012] Step 5: Coating: Place the PC matrix material in the coating solution for coating. Among them, the coating solution ratio is 10%-12.5% alkoxysilane chain extender, 5%-10% aqueous silica solution, 0.5%-2.5% alkoxysilane crosslinking agent, 0.1%-0.25% catalyst, and 75%-85% solvent.

[0013] Optionally, in the step 4, the barrel temperature of the injection molding machine is set at 200-250 °C, the screw speed is set at 40-70 rpm, the mold temperature is set at 80 °C, and the pressure is 1000T.

[0014] Optionally, in the step 5, the alkoxysilane chain extender is dimethyldimethoxysilane, the alkoxysilane crosslinking agent is methyltrimethoxysilane, the aqueous silica solution is an acidic aqueous silica solution, the catalyst is tetrabutylammonium acetate, and the solvent is n-butanol.

[0015] Optionally, the step 1 specifically includes:

[0016] Add 95% PC particles, 1% nano-barium sulfate, and 4% nano-silica into a high-speed stirring mixer for mixing to obtain the solid plastic.

[0017] The third aspect of the embodiments of the present application provides a radiation-proof large viewing window glove box, and the glove box includes: a box body;

[0018] At least one viewing window is provided on the box body;

[0019] A composite structure glass is provided on the viewing window; the inner layer of the composite structure glass is any one of the PC glasses provided in the first aspect of the embodiments of the present application, the middle layer is lead glass, and the outer layer is tempered glass.

[0020] Optionally, four viewing windows are provided on the front of the glove box, and the four viewing windows are arranged in a "field" shape.

[0021] Optionally, four viewing windows are provided on the back of the glove box, and the four viewing windows are arranged in a "field" shape.

[0022] Optionally, the glove holes of the glove box are all arranged on the viewing window.

[0023] The beneficial technical effects of the present application are as follows:

[0024] A PC glass, a preparation method thereof, and a radiation-proof large-viewing-window glove box provided by an embodiment of the present application. Nano barium sulfate and nano silicon dioxide are added to the PC glass, and a coating is formed on its surface due to the use of an alkoxysilane crosslinking agent and an alkoxysilane chain extender. When the performance requirements such as radiation shielding and safety of the glove box are still met, the visible range of the glove box operator is greatly increased, and the yellowing phenomenon of the viewing window under long-term irradiation is improved, which greatly facilitates the operator to observe the operations inside the glove box and greatly reduces the misoperation rate of the operator. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a radiation-proof large-viewing-window glove box provided by an embodiment of the present application.

[0026] In the figure:

[0027] 1 - box body, 2 - viewing window, 3 - glove hole. Detailed Embodiments

[0028] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the following described embodiments are only a part of the embodiments of the present application, rather than all. Based on the embodiments described in the present application, all other embodiments obtained by those skilled in the art without creative efforts are within the scope of protection of the present application.

[0029] A PC glass provided by an embodiment of the present application. Nano barium sulfate and nano silicon dioxide are added to the PC glass, and a coating is formed on its surface due to the use of an alkoxysilane crosslinking agent and an alkoxysilane chain extender.

[0030] It should be noted that after adding nano barium sulfate and nano silicon dioxide to the PC material and modifying the PC material, it not only maintains a certain transparency but also improves the hardness and radiation resistance aging property. Moreover, nano barium sulfate not only has the characteristics of small size, large specific surface area, and high surface energy of ordinary nanoparticles, but also can contact, coat, and strongly interact with the polymer, and may even form a chemical bond with the polymer matrix, having a special impact on the mechanical properties, thermal properties, optical properties, etc. of the composite material. Second, the coating formed by the siloxane solution not only has good uniformity and transparency, but also is not easy to fall off and turn yellow, and at the same time is wear-resistant, resistant to chemical solvents, and resistant to high and low temperature impacts. The improved PC glass not only meets the strength requirements for manufacturing a large viewing window but also improves the yellowing phenomenon under long-term irradiation environment.

[0031] In one example, the alkoxysilane chain extender can be dimethyldimethoxysilane, and the alkoxysilane crosslinking agent can be methyltrimethoxysilane.

[0032] Based on a kind of PC glass provided in the above embodiments, the embodiments of the present application also provide a method for preparing a PC glass, which is used to prepare any one of the PC glasses provided in the above embodiments.

[0033] A method for preparing a PC glass provided by the embodiments of the present application includes:

[0034] Step 1: Mixing materials: Adding PC particles, nano barium sulfate, and nano silicon dioxide into a high-speed stirring mixer to mix and obtain solid plastics.

[0035] Step 2: Extrusion: Divided into two stages. The first stage is to plasticize the solid plastics and make them pass through a die under pressure to become a continuous body. The second stage is to make the extruded continuous body lose its plastic state and become a solid to obtain the required product.

[0036] Step 3: Pelletizing: The extruded PC is crushed by a powerful crusher for use in injection molding.

[0037] Step 4: Injection molding: Injecting the crushed PC pellets, and finally demolding to obtain a PC matrix material.

[0038] Step 5: Coating: Placing the PC matrix material in a coating solution for coating. Among them, the coating solution ratio is 10%-12.5% alkoxysilane chain extender, 5%-10% silicon dioxide aqueous solution, 0.5%-2.5% alkoxysilane crosslinking agent, 0.1%-0.25% catalyst, and 75%-85% solvent.

[0039] It should be noted that during the coating process, siloxane monomers hydrolyze to form silanols. While the silanols self-condense, they also react with the nano silicon dioxide particles in the PC matrix material to form bonds, forming a coating in which the organic phase and the inorganic phase are integrated.

[0040] In one example, in the step 4, the barrel temperature of the injection molding machine is set at 200-250°C, the screw speed is set at 40-70 rpm, the mold temperature is set at 80°C, and the pressure is 1000T.

[0041] In another example, in the step 5, the alkoxysilane chain extender is dimethyldimethoxysilane, the alkoxysilane crosslinking agent is methyltrimethoxysilane, the silicon dioxide aqueous solution is an acidic silicon dioxide aqueous solution, the catalyst is tetrabutylammonium acetate, and the solvent is n-butanol.

[0042] In some possible implementation manners of the embodiments of the present application, step one may specifically include:

[0043] Add 95% PC particles, 1% nano barium sulfate, and 4% nano silicon dioxide into a high-speed stirring mixer for mixing to obtain the solid plastic.

[0044] It should be noted that there are two key steps in the manufacturing process of PC glass. One is to add nano barium sulfate and nano silicon dioxide to the PC material before mixing. After the PC material is modified, it not only maintains a certain transparency but also improves hardness and radiation resistance to aging. Moreover, nano barium sulfate not only has the characteristics of small size, large specific surface area, and high surface energy of ordinary nanoparticles but also can contact, coat, and strongly interact with the polymer, and may even form a chemical bond with the polymer matrix, having a special impact on the mechanical properties, thermal properties, optical properties, etc. of the composite material. The other is to coat the surface of the PC material after the composite sample. The coating formed by the siloxane solution is not only uniform and transparent but also not easy to fall off and turn yellow, and at the same time is wear-resistant, resistant to chemical solvents, and resistant to high and low temperature impacts.

[0045] Based on the PC glass and its preparation method provided in the above embodiments, the embodiments of the present application further provide a radiation-proof large-view glove box.

[0046] See Figure 1 , which is a schematic structural diagram of a radiation-proof large-view glove box provided in the embodiments of the present application.

[0047] A radiation-proof large-view glove box provided in the embodiments of the present application includes: a box body 1;

[0048] At least one viewing window 2 is provided on the box body 1;

[0049] A composite structure glass is provided on the viewing window 2; the inner layer of the composite structure glass is any one of the PC glasses provided in the above embodiments, the middle layer is lead glass, and the outer layer is tempered glass.

[0050] It can be understood that the PC glass provided in the above embodiments not only meets the strength requirements for manufacturing large viewing windows but also improves the phenomenon of turning yellow in a long-term irradiation environment. The specific principle can refer to the relevant descriptions in the above embodiments and will not be elaborated here.

[0051] In one example, four viewing windows 2 are provided in the front of the glove box, and the four viewing windows 2 are arranged in a "field" shape.

[0052] In one example, four viewing windows 2 are provided in the back of the glove box, and the four viewing windows 2 are arranged in a "field" shape.

[0053] It can be understood that the "field" - shaped viewing window 2 can not only ensure that the area of each viewing window 2 is not too large, but also ensure that the operator can easily observe the operations inside the glove box when operating the glove box.

[0054] In some possible implementation manners of the embodiments of the present application, the glove holes 3 of the glove box are all arranged on the viewing window 2. When the performance of the glove box such as radiation shielding and safety still meets the requirements, the visible range of the operator of the glove box is greatly increased, and the yellowing phenomenon of the viewing window under long - term irradiation is improved. It greatly facilitates the operator to observe the operations inside the glove box and greatly reduces the misoperation rate of the operator.

[0055] The present application has been described in detail above in conjunction with the drawings and embodiments. However, the present application is not limited to the above - mentioned embodiments. Within the scope of knowledge possessed by those of ordinary skill in the art, various changes can be made without departing from the purpose of the present application. The content not described in detail in the present application can all adopt the prior art.

Claims

1. A PC glass, characterized in that, The PC glass is added with nano-barium sulfate and nano-silica, and a coating is formed on its surface due to the use of an alkoxysilane crosslinking agent and an alkoxysilane chain extender.

2. The PC glass according to claim 1, wherein The alkoxysilane chain extender is dimethyldimethoxysilane, and the alkoxysilane crosslinking agent is methyltrimethoxysilane.

3. A method for preparing PC glass, characterized in that, For preparing the PC glass according to claim 1 or 2; the method includes: Step 1: Mixing materials: Adding PC particles, nano-barium sulfate, and nano-silica into a high-speed stirring mixer to mix and obtain a solid plastic. Step 2: Extrusion: Divided into two stages. The first stage is to plasticize the solid plastic and make it pass through a die under pressure to become a continuous body. The second stage is to make the extruded continuous body lose its plastic state and become a solid to obtain the required product. Step 3: Pelletizing: The extruded PC is passed through a powerful crusher for crushing and waiting to be used for injection molding. Step 4: Injection molding: Injecting the crushed PC pellets, and finally demolding to obtain the PC matrix material. Step 5: Coating: Placing the PC matrix material in a coating solution for coating. Among them, the coating solution ratio is 10%-12.5% alkoxysilane chain extender, 5%-10% silica aqueous solution, 0.5%-2.5% alkoxysilane crosslinking agent, 0.1%-0.25% catalyst, and 75%-85% solvent.

4. The method for preparing PC glass according to claim 3, characterized in that, In the step 4, the barrel temperature of the injection molding machine is set at 200-250 °C, the screw speed is set at 40-70 rpm, the mold temperature is set at 80 °C, and the pressure is 1000T.

5. The method for preparing PC glass according to claim 3, characterized in that, In the step 5, the alkoxysilane chain extender is dimethyldimethoxysilane, the alkoxysilane crosslinking agent is methyltrimethoxysilane, the silica aqueous solution is an acidic silica aqueous solution, the catalyst is tetrabutylammonium acetate, and the solvent is n-butanol.

6. The method for preparing PC glass according to claim 3, wherein The step 1 specifically includes: Adding 95% PC particles, 1% nano-barium sulfate, and 4% nano-silica into a high-speed stirring mixer to mix and obtain the solid plastic.

7. A radiation-proof large-view glove box, characterized in that, The glove box includes: a box body (1); At least one viewing window (2) is provided on the box body (1); A composite structure glass is provided on the viewing window (2); the inner layer of the composite structure glass is the PC glass according to claim 1 or 2, the middle layer is lead glass, and the outer layer is tempered glass.

8. The radiation-proof large-view window glove box according to claim 7, wherein, Four viewing windows (2) are provided in the front of the glove box, and the four viewing windows (2) are arranged in a "field" shape.

9. The radiation-proof large viewing window glove box according to claim 7 or 8, characterized in that, Four viewing windows (2) are provided in the back of the glove box, and the four viewing windows (2) are arranged in a "field" shape.

10. The radiation-proof large-view glove box according to claim 7, wherein, The glove holes (3) of the glove box are all provided on the viewing window (2).

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