Polycarbonate sheet and preparation method thereof

Abstract

The present invention provides a polycarbonate plate and a preparation method thereof. The polycarbonate plate of the present invention is prepared from raw materials including polycarbonate resin, anti-condensation additive, calcium hydroxide, anti-ultraviolet agent, antioxidant, transparency enhancer and plasticizer. The polycarbonate plate has the characteristics of anti-impact, light weight, good sound insulation effect, good light transmittance, strong plasticity, good flame retardancy, strong weather resistance and anti-condensation. The present invention also provides a preparation method of the polycarbonate plate.

Description

Technical Field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a polycarbonate board and a preparation method thereof. Background Art

[0002] The application of polycarbonate sheets in the field of road and bridge construction has attracted widespread attention. This high-performance material has excellent transparency, strength and weather resistance, making it an ideal choice for many transportation and infrastructure projects. For example, polycarbonate sheets are widely used in highway isolation railings and tunnel coverings, which can provide high transparency and weather resistance, helping to improve drivers' sense of safety and visibility. On the road, polycarbonate sheets are used to make road signs and signs, providing eye-catching visual effects and being able to resist UV radiation and harsh weather conditions. Polycarbonate sheets are also used to build highway sound insulation walls, which can reduce noise pollution and improve the quality of life of surrounding communities. In bridge structures, polycarbonate sheets are used as transparent railings, providing beautiful designs and protecting pedestrians and vehicles from falling risks.

[0003] However, although polycarbonate sheets have achieved remarkable success in these fields, there are still some technical challenges and problems that need to be solved. Polycarbonate sheets may fade and age under long-term UV exposure, which may affect their transparency and durability. In highway and road facilities, polycarbonate sheets may be subject to impacts caused by traffic accidents, so it is necessary to ensure that they have sufficient impact resistance to provide safety. Under extreme temperatures, polycarbonate sheets may undergo dimensional changes, which may have an impact on the stability of the structure.

[0004] Therefore, in order to meet the application needs of roads, bridges, railways, residential areas and other places, a new polycarbonate sheet still needs to be developed. Summary of the invention

[0005] The present invention aims to solve at least one of the above-mentioned technical problems existing in the prior art. To this end, the present invention provides a polycarbonate board having the characteristics of anti-impact, light weight, good sound insulation effect, good light transmittance, strong plasticity, good flame retardancy, strong weather resistance and anti-condensation.

[0006] The invention also provides a method for preparing the polycarbonate plate.

[0007] A first aspect of the present invention provides a polycarbonate plate, wherein the raw materials for preparing the polycarbonate plate include polycarbonate resin, an anti-condensation additive, calcium hydroxide, an anti-ultraviolet agent, an antioxidant, a transparency enhancer and a plasticizer.

[0008] One of the technical solutions of the present invention regarding the polycarbonate plate has at least the following beneficial effects:

[0009] The polycarbonate sheet of the present invention, under the joint action of various raw materials, has the characteristics of anti-impact, light weight, good sound insulation effect, good light transmittance, strong plasticity, good flame retardancy, strong weather resistance and anti-condensation. Specifically:

[0010] The impact strength is 250-300 times that of ordinary glass, 30 times that of acrylic plate of the same thickness, and 2-20 times that of tempered glass. It can be dropped from less than two meters with a 3kg hammer without any cracks.

[0011] The specific gravity is only half of that of glass, saving the cost of transportation, handling, installation and supporting frame.

[0012] Good sound insulation. It has better sound insulation than glass and acrylic panels of the same thickness. Under the condition of the same thickness, the sound insulation of PC board is 3-4dB higher than that of glass.

[0013] Good light transmittance. The light transmittance can reach 85%, comparable to glass.

[0014] Strong plasticity. It can be customized into a top arc or a large-sized sound barrier. The PC board is bendable and can be cold-bent on site according to the design drawing to form an arc, or hot-bent.

[0015] Good flame retardancy. It is flame retardant level 1, with a self-ignition point of 580°C. It will extinguish itself after leaving the fire. It will not produce toxic gases when burning and will not contribute to the spread of fire.

[0016] Strong weather resistance. It does not become cold and brittle at -100℃, does not soften at 135℃, and has no obvious changes in mechanical properties under harsh environments. In addition, after 4000 hours of artificial climate aging test, the yellowing degree is 2, and the light transmittance reduction value is only 0.6%. The surface of the material is not easy to condense.

[0017] In the preparation of polycarbonate sheets, various raw materials and ingredients play different roles to achieve the desired performance and characteristics. The following is a detailed description of the role of each raw material:

[0018] Polycarbonate resin is the basic material of polycarbonate board, which provides the main strength and rigidity of the board. In addition, polycarbonate resin also has a high degree of transparency, giving the board a good visual effect.

[0019] Anti-condensation additives are used to reduce or prevent the formation of condensation, especially in low temperature or high humidity conditions. They improve transparency and visual clarity by changing the surface properties so that moisture is less likely to condense on the surface of the sheet.

[0020] Calcium hydroxide can be used as an anti-condensation additive, which helps to absorb and disperse moisture in the air, further reducing the risk of condensation.

[0021] Anti-UV agents are chemicals used to improve the UV resistance of panels. They can absorb or disperse UV radiation, prevent color fading and material aging caused by UV rays, and thus extend the service life of the panels.

[0022] Antioxidants help slow down the oxidation reaction of the material and improve weather resistance. They prevent oxygen and other oxidants from damaging the sheet, maintaining its performance and transparency.

[0023] Clarity enhancers are used to improve the clarity and optical properties of sheets. They can reduce surface defects, increase light transmittance, and improve the visual quality of sheets.

[0024] Plasticizers can provide flexibility and processability to the board, making it easier to shape and process. This helps to improve the plasticity of the board and adapt it to different preparation processes.

[0025] These raw materials and components interact in the preparation process of polycarbonate sheets to meet the needs of roads and bridges.

[0026] According to some embodiments of the present invention, the thickness of the polycarbonate plate is 6 mm to 10 mm.

[0027] According to some embodiments of the present invention, the thickness of the polycarbonate sheet is about 8 mm.

[0028] According to some embodiments of the present invention, the surface of the polycarbonate board is coated with a silicone hardened wear-resistant coating, which can reduce dust absorption.

[0029] According to some embodiments of the present invention, the preparation raw materials include, by weight:

[0030] Polycarbonate resin: 100 parts,

[0031] Anti-condensation additive: 2 to 5 parts,

[0032] Calcium hydroxide: 0.5 to 1 part,

[0033] Anti-ultraviolet agent: 2 to 4 parts,

[0034] Antioxidant: 0.2 to 0.5 parts,

[0035] Transparency enhancer: 1 to 2 parts,

[0036] Plasticizer: 1 to 5 parts.

[0037] By precisely controlling the proportions of the various raw materials, the properties and characteristics of the board can be adjusted to meet the requirements of specific applications.

[0038] According to some embodiments of the present invention, the anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene.

[0039] PTFE is a non-polar material with a high surface tension that increases the water contact angle on the material surface, making it easier for water droplets to form on the surface, reducing the chance of condensation. Since the two materials create an environment on the surface that is not easily wetted by water, combining silica and PTFE can effectively reduce the formation of water droplets on the surface and help inhibit the occurrence of condensation.

[0040] According to some embodiments of the present invention, the mass ratio of the anti-condensation additive silicon dioxide to polytetrafluoroethylene is 1:2-4.

[0041] According to some embodiments of the present invention, the anti-ultraviolet agent includes at least one of zinc oxide and titanium dioxide.

[0042] According to some embodiments of the present invention, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol and triphenyl phosphate.

[0043] According to some embodiments of the present invention, the transparency enhancer is a mixture of zinc oxide and aluminum oxide.

[0044] Aluminum oxide has high thermal stability, which helps the material maintain transparency under high temperature conditions. In addition, both zinc oxide and aluminum oxide have certain weather resistance, which can help the material resist aging and fading caused by ultraviolet radiation and meteorological factors. In addition, zinc oxide and aluminum oxide have certain chemical stability, which can resist the erosion of some chemicals and improve the durability of the material.

[0045] Zinc oxide and aluminum oxide can increase the transmittance of light in transparent or translucent materials, thereby enhancing the transparency of the material, making it more suitable for application in fields requiring good transparency.

[0046] Mixing zinc oxide and aluminum oxide can improve the optical properties of the material, including reducing scattering, increasing light transmission and reducing reflection. This helps improve the visual quality of the material.

[0047] According to some embodiments of the present invention, the mass ratio of zinc oxide to aluminum oxide is 1:5-10.

[0048] According to some embodiments of the present invention, the plasticizer is at least one of di(2-ethylhexyl)phthalate, dibutyl phthalate and dimethyl phthalate.

[0049] The second aspect of the present invention provides a method for preparing the polycarbonate plate of the present invention, comprising the following steps: mixing the raw materials for preparing the polycarbonate plate, and then extruding and molding.

[0050] A technical solution in the method for preparing a polycarbonate sheet of the present invention has at least the following beneficial effects:

[0051] The preparation method of the present invention does not require expensive equipment and complicated process control, has undemanding reaction conditions, has readily available raw materials, has low production costs, and is easy to industrialize.

[0052] According to some embodiments of the present invention, the extrusion temperature of the polycarbonate sheet is 200°C to 240°C. DETAILED DESCRIPTION

[0053] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0054] In some embodiments of the present invention, the present invention provides a polycarbonate plate, wherein the raw materials for preparing the polycarbonate plate include polycarbonate resin, an anti-condensation additive, calcium hydroxide, an anti-ultraviolet agent, an antioxidant, a transparency enhancer, and a plasticizer.

[0055] It can be understood that the polycarbonate sheet of the present invention, under the combined effect of various raw materials, has the characteristics of anti-impact, light weight, good sound insulation, good light transmittance, strong plasticity, good flame retardancy, strong weather resistance and anti-condensation. Specifically:

[0056] The impact strength of the polycarbonate plate of the invention is 250-300 times that of ordinary glass, 30 times that of acrylic plates of the same thickness, and 2-20 times that of tempered glass. The polycarbonate plate can be dropped from a height of less than two meters by a 3kg hammer without any cracks.

[0057] The polycarbonate board of the present invention has a specific gravity only half that of glass, thus saving the costs of transportation, handling, installation and supporting frame.

[0058] The polycarbonate board of the present invention has good sound insulation effect and better sound insulation than glass and acrylic boards of the same thickness. Under the condition of the same thickness, the sound insulation of the PC board is 3-4dB higher than that of glass.

[0059] The polycarbonate plate of the present invention has good light transmittance, and the light transmittance can reach 85%, which is comparable to that of glass.

[0060] The polycarbonate board of the present invention has strong plasticity and can be customized into a top arc-shaped sound barrier for large households. The PC board is bendable and can be cold-bent on site according to the design drawing to form an arc, or hot-bent.

[0061] The polycarbonate plate of the present invention has good flame retardancy and is of the first-class flame retardancy. Its own ignition point reaches 580°C, and it extinguishes itself after leaving the fire. It does not generate toxic gas during combustion and does not promote the spread of fire.

[0062] The polycarbonate sheet of the present invention has strong weather resistance. It does not become cold and brittle at -100°C, does not soften at 135°C, and has no obvious changes in mechanical properties and mechanical properties under harsh environments. In addition, after 4000 hours of artificial weather aging test, the yellowing degree is 2, and the light transmittance reduction value is only 0.6%. It is not easy to condense on the surface of the material.

[0063] In the preparation of polycarbonate sheets, various raw materials and ingredients play different roles to achieve the desired performance and characteristics. The following is a detailed description of the role of each raw material:

[0064] Polycarbonate resin is the basic material of polycarbonate board, which provides the main strength and rigidity of the board. In addition, polycarbonate resin also has a high degree of transparency, giving the board a good visual effect.

[0065] Anti-condensation additives are used to reduce or prevent the formation of condensation, especially in low temperature or high humidity conditions. They improve transparency and visual clarity by changing the surface properties so that moisture is less likely to condense on the surface of the sheet.

[0066] Calcium hydroxide can be used as an anti-condensation additive, which helps to absorb and disperse moisture in the air, further reducing the risk of condensation.

[0067] Anti-UV agents are chemicals used to improve the UV resistance of panels. They can absorb or disperse UV radiation, prevent color fading and material aging caused by UV rays, and thus extend the service life of the panels.

[0068] Antioxidants help slow down the oxidation reaction of the material and improve weather resistance. They prevent oxygen and other oxidants from damaging the sheet, maintaining its performance and transparency.

[0069] Clarity enhancers are used to improve the clarity and optical properties of sheets. They can reduce surface defects, increase light transmittance, and improve the visual quality of sheets.

[0070] Plasticizers can provide flexibility and processability to the board, making it easier to shape and process. This helps to improve the plasticity of the board and adapt it to different preparation processes.

[0071] These raw materials and components interact in the preparation process of polycarbonate sheets to meet the needs of roads and bridges.

[0072] In some embodiments of the present invention, the thickness of the polycarbonate plate is 6 mm to 10 mm.

[0073] In some embodiments of the present invention, the thickness of the polycarbonate sheet is about 8 mm.

[0074] In some embodiments of the present invention, the surface of the polycarbonate board is coated with a silicone hardened wear-resistant coating to reduce dust absorption.

[0075] In some embodiments of the present invention, the raw materials for preparation include, by weight:

[0076] Polycarbonate resin: 100 parts,

[0077] Anti-condensation additive: 2 to 5 parts,

[0078] Calcium hydroxide: 0.5 to 1 part,

[0079] Anti-ultraviolet agent: 2 to 4 parts,

[0080] Antioxidant: 0.2 to 0.5 parts,

[0081] Transparency enhancer: 1 to 2 parts,

[0082] Plasticizer: 1 to 5 parts.

[0083] By precisely controlling the proportions of the various raw materials, the properties and characteristics of the board can be adjusted to meet the requirements of specific applications.

[0084] In some embodiments of the present invention, the anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene.

[0085] PTFE is a non-polar material with a high surface tension that increases the water contact angle on the material surface, making it easier for water droplets to form on the surface, reducing the chance of condensation. Since the two materials create an environment on the surface that is not easily wetted by water, combining silica and PTFE can effectively reduce the formation of water droplets on the surface and help inhibit the occurrence of condensation.

[0086] In some embodiments of the present invention, the mass ratio of the anti-condensation additive silicon dioxide to polytetrafluoroethylene is 1:2-4.

[0087] In some embodiments of the present invention, the UV inhibitor includes at least one of zinc oxide and titanium dioxide.

[0088] In some embodiments of the present invention, the antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol and triphenyl phosphate.

[0089] In some embodiments of the present invention, the transparency enhancer is a mixture of zinc oxide and aluminum oxide.

[0090] Aluminum oxide has high thermal stability, which helps the material maintain transparency under high temperature conditions. In addition, both zinc oxide and aluminum oxide have certain weather resistance, which can help the material resist aging and fading caused by ultraviolet radiation and meteorological factors. In addition, zinc oxide and aluminum oxide have certain chemical stability, which can resist the erosion of some chemicals and improve the durability of the material.

[0091] Zinc oxide and aluminum oxide can increase the transmittance of light in transparent or translucent materials, thereby enhancing the transparency of the material, making it more suitable for application in fields requiring good transparency.

[0092] Mixing zinc oxide and aluminum oxide can improve the optical properties of the material, including reducing scattering, increasing light transmission and reducing reflection. This helps improve the visual quality of the material.

[0093] In some embodiments of the present invention, the mass ratio of zinc oxide to aluminum oxide is 1:5-10.

[0094] In some embodiments of the present invention, the plasticizer is at least one of di(2-ethylhexyl)phthalate, dibutyl phthalate, and dimethyl phthalate.

[0095] In some other embodiments of the present invention, a method for preparing the polycarbonate plate of the present invention is provided, comprising the following steps: mixing the raw materials for preparing the polycarbonate plate, and then extruding and molding.

[0096] It can be understood that the preparation method of the present invention does not require expensive equipment and complex process control, the reaction conditions are not harsh, the raw materials are easily available, the production cost is low, and it is easy to industrialize production.

[0097] In some embodiments of the present invention, the extrusion temperature of the polycarbonate sheet is 200°C to 240°C.

[0098] The technical solution of the present invention will be better understood with reference to specific embodiments below.

[0099] It should be noted that in the examples and comparative examples, all raw materials are commercially available.

[0100] Example 1

[0101] A polycarbonate plate is prepared, and the raw materials for the preparation include, by weight:

[0102] Polycarbonate resin: 100 parts,

[0103] Anti-condensation additive: 2 parts,

[0104] Calcium hydroxide: 0.5 parts,

[0105] Anti-ultraviolet agent: 2 parts,

[0106] Antioxidant: 0.2 parts,

[0107] Transparency enhancer: 1 part,

[0108] Plasticizer: 1 part.

[0109] The anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene in a mass ratio of 1:2.

[0110] The UV inhibitor is zinc oxide.

[0111] The antioxidant is 2,6-di-tert-butyl-p-cresol.

[0112] The transparency enhancer is a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:5.

[0113] The plasticizer is di(2-ethylhexyl) phthalate.

[0114] The preparation method comprises the following steps: mixing the raw materials for preparing the polycarbonate plate and then extruding the mixture into a mold.

[0115] The extrusion temperature was 220°C.

[0116] The thickness of the polycarbonate sheet is 8 mm.

[0117] Example 2

[0118] A polycarbonate plate is prepared, and the raw materials for the preparation include, by weight:

[0119] Polycarbonate resin: 100 parts,

[0120] Anti-condensation additive: 3 parts,

[0121] Calcium hydroxide: 0.75 parts,

[0122] Anti-ultraviolet agent: 3 parts,

[0123] Antioxidant: 0.35 parts,

[0124] Transparency enhancer: 1.5 parts,

[0125] Plasticizer: 3 parts.

[0126] The anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene in a mass ratio of 1:3.

[0127] The UV inhibitor is zinc oxide.

[0128] The antioxidant is 2,6-di-tert-butyl-p-cresol.

[0129] The transparency enhancer is a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:7.

[0130] The plasticizer is di(2-ethylhexyl) phthalate.

[0131] The preparation method comprises the following steps: mixing the raw materials for preparing the polycarbonate plate and then extruding the mixture into a mold.

[0132] The extrusion temperature was 220°C.

[0133] The thickness of the polycarbonate sheet is 8 mm.

[0134] Example 3

[0135] A polycarbonate plate is prepared, and the raw materials for the preparation include, by weight:

[0136] Polycarbonate resin: 100 parts,

[0137] Anti-condensation additive: 5 parts,

[0138] Calcium hydroxide: 1 part,

[0139] Anti-ultraviolet agent: 4 parts,

[0140] Antioxidant: 0.5 parts,

[0141] Transparency enhancer: 2 parts,

[0142] Plasticizer: 5 parts.

[0143] The anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene in a mass ratio of 1:4.

[0144] The UV inhibitor is zinc oxide.

[0145] The antioxidant is 2,6-di-tert-butyl-p-cresol.

[0146] The transparency enhancer is a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:10.

[0147] The plasticizer is di(2-ethylhexyl) phthalate.

[0148] The preparation method comprises the following steps: mixing the raw materials for preparing the polycarbonate plate and then extruding the mixture into a mold.

[0149] The extrusion temperature was 240°C.

[0150] The thickness of the polycarbonate sheet is 8 mm.

[0151] Example 4

[0152] A polycarbonate plate is prepared, and the raw materials for the preparation include, by weight:

[0153] Polycarbonate resin: 100 parts,

[0154] Anti-condensation additive: 5 parts,

[0155] Calcium hydroxide: 1 part,

[0156] Anti-ultraviolet agent: 4 parts,

[0157] Antioxidant: 0.5 parts,

[0158] Transparency enhancer: 2 parts,

[0159] Plasticizer: 5 parts.

[0160] The anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene in a mass ratio of 1:4.

[0161] The UV inhibitor is zinc oxide.

[0162] The antioxidant is 2,6-di-tert-butyl-p-cresol.

[0163] The transparency enhancer is a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:10.

[0164] The plasticizer is di(2-ethylhexyl) phthalate.

[0165] The preparation method comprises the following steps: mixing the raw materials for preparing the polycarbonate plate and then extruding the mixture into a mold.

[0166] The extrusion temperature was 240°C.

[0167] After extrusion molding, the surface is coated with a silicone hardened wear-resistant coating.

[0168] The thickness of the polycarbonate sheet is 8 mm.

[0169] The preparation method of the organosilicon hardened wear-resistant paint is as follows:

[0170] By weight, 10 parts of ethanol, 10 parts of isopropanol, 35 parts of ethylene glycol butyl ether, 2 parts of curing agent, and 3 parts of polyester adhesion promoter are added to 40 parts of modified polysiloxane resin solution and mixed evenly to obtain a silicone hardened wear-resistant paint with a solid content of 25%.

[0171] The preparation method of the modified polysiloxane resin solution is:

[0172] 10 g of TEOS and 120 g of MTES were added to a three-necked flask, the temperature was controlled at 30° C., acetic acid was added as a catalyst, and deionized water was dripped in for hydrolysis and polycondensation reaction.

[0173] When the reaction system becomes transparent, CTMS is added, stirred evenly and kept warm at 80° C. for 6 h to obtain a colorless and transparent modified polysiloxane resin solution.

[0174] Comparative Example 1

[0175] A polycarbonate plate is prepared, and the raw materials for the preparation include, by weight:

[0176] Polycarbonate resin: 100 parts,

[0177] Anti-condensation additive: 5 parts,

[0178] Calcium hydroxide: 1 part,

[0179] Anti-ultraviolet agent: 4 parts,

[0180] Antioxidant: 0.5 parts,

[0181] Transparency enhancer: 2 parts,

[0182] Plasticizer: 5 parts.

[0183] The anti-condensation additive is silicon dioxide.

[0184] The UV inhibitor is zinc oxide.

[0185] The antioxidant is 2,6-di-tert-butyl-p-cresol.

[0186] The transparency enhancer is a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:10.

[0187] The plasticizer is di(2-ethylhexyl) phthalate.

[0188] The preparation method comprises the following steps: mixing the raw materials for preparing the polycarbonate plate and then extruding the mixture into a mold.

[0189] The extrusion temperature was 240°C.

[0190] Comparative Example 2

[0191] A polycarbonate plate is prepared, and the raw materials for the preparation include, by weight:

[0192] Polycarbonate resin: 100 parts,

[0193] Anti-condensation additive: 5 parts,

[0194] Calcium hydroxide: 1 part,

[0195] Anti-ultraviolet agent: 4 parts,

[0196] Antioxidant: 0.5 parts,

[0197] Transparency enhancer: 2 parts,

[0198] Plasticizer: 5 parts.

[0199] The anti-condensation additive is polytetrafluoroethylene.

[0200] The UV inhibitor is zinc oxide.

[0201] The antioxidant is 2,6-di-tert-butyl-p-cresol.

[0202] The transparency enhancer is a mixture of zinc oxide and aluminum oxide in a mass ratio of 1:10.

[0203] The plasticizer is di(2-ethylhexyl) phthalate.

[0204] The preparation method comprises the following steps: mixing the raw materials for preparing the polycarbonate plate and then extruding the mixture into a mold.

[0205] The extrusion temperature was 240°C.

[0206] Performance Testing

[0207] The polycarbonate plates of Examples 1 to 4 and Comparative Examples 1 and 2 were subjected to performance tests, and the test process was as follows:

[0208] Bending test: refer to ISO 178:2019 method A, specimen 80mm×9.9mm×3.9mm, test speed 2mm / min span 64mm, laboratory environmental conditions: 23±2℃, 50±5%RH.

[0209] Tensile test: refer to ISO-527-1:2012 & ISO 527-2:2012, test conditions: specimen 1A, specimen width at narrow part 9.98mm, specimen thickness 3.9mm, test speed 50mm / min, gauge length 75mm, initial clamp spacing 115mm, laboratory environmental conditions: 23±2℃, 50±5%RH.

[0210] Corrosion resistance: Soak each group of test materials in a 10% by mass hydrochloric acid solution for 10 days, then take them out and test their mass changes, observe whether they swell or have bubbles, and test their acid resistance. Soak each group of test materials in a 10% by mass sodium hydroxide solution for 10 days, then take them out and test their mass changes, observe whether they swell or have bubbles, and test their alkali resistance.

[0211] Aging resistance: The samples were subjected to artificial aging tests using a UV2000 fluorescent ultraviolet aging test box (UVB-313 lamp tube). The test irradiation intensity was 0.55W / m 2 @340nm, test temperature 50℃. Test period 7d, observe the changes of the sample and measure its tensile properties.

[0212] The test results are shown in Table 1.

[0213] Table 1

[0214]

[0215] In order to better evaluate the anti-condensation effect of the polyurethane board of the present invention, the boards of the embodiment and the comparative example were cut into 10×10mm samples and subjected to anti-condensation experiments. The samples were placed in a constant temperature and humidity chamber to examine their anti-condensation performance. Under the same conditions (sample surface temperature 18±0.2℃, ambient temperature 24.1±0.2℃, relative humidity 79%), the condensation appearance time on the sample surface was recorded. The results are shown in Table 2.

[0216] Table 2

[0217]

[0218]

[0219] The plates of the embodiment and the comparative example were cut into 10×10 mm samples, and a wear test was carried out on a wear testing machine. The machine was rotated 2000 times. The samples after the wear test were weighed and the wear rate was calculated. The wear rate γ=(m1-m2) / m1×100%, where m1 represents the mass before the wear test and m2 represents the mass after the wear test. The test results are shown in Table 3.

[0220] Table 3

[0221] project Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 <![CDATA[m1 / g]]> 20g 21g 20g 23g 20g 20g <![CDATA[m2 / g]]> 19.141g 19.427g 19.689g 19.833g 18.751g 18.497g γ / % 4.30 2.87 1.56 13.77 6.24 7.52

[0222] The present invention has been described in detail above in conjunction with the embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A polycarbonate sheet, characterized in that: In parts by weight, the raw materials for preparation include: Polycarbonate resin: 100 parts, Anti-condensation additive: 2 to 5 parts, Calcium hydroxide: 0.5 to 1 part, Anti-ultraviolet agent: 2 to 4 parts, Antioxidant: 0.2 to 0.5 parts, Transparency enhancer: 1 to 2 parts, Plasticizer: 1 to 5 parts, The anti-condensation additive is a mixture of silicon dioxide and polytetrafluoroethylene, and the mass ratio of silicon dioxide to polytetrafluoroethylene is 1:2-4; The anti-ultraviolet agent includes at least one of zinc oxide and titanium dioxide; The antioxidant includes at least one of 2,6-di-tert-butyl-p-cresol and triphenyl phosphate; The transparency enhancer is a mixture of zinc oxide and aluminum oxide; The mass ratio of zinc oxide to aluminum oxide is 1:5-10; The plasticizer is at least one of di(2-ethylhexyl) phthalate, dibutyl phthalate and dimethyl phthalate.

2. A method for preparing the polycarbonate sheet according to claim 1, characterized in that: The following steps are involved: The raw materials for preparing the polycarbonate sheet are mixed and then extruded into shape.

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