Ultraviolet shielding panel and method of manufacturing

Abstract

The application discloses a UV shielding plate and a manufacturing method, which comprises the following components in parts by weight: 50-70 parts of an acrylic resin, 15-30 parts of sodium hexametaphosphate, 4-8 parts of a UV shielding agent, 1-5 parts of a silane coupling agent, 0.4-1 part of an initiator and 40-60 parts of water; the application achieves the function of absorbing ultraviolet rays through titanium dioxide formed by ferric oxide and tetrabutyl titanate; heavy calcium carbonate can play the role of a carrier in the UV shielding agent, so that ferric oxide and titanium dioxide are adsorbed on the surface of heavy calcium carbonate particles; the heavy calcium carbonate can play the role of a network skeleton in the UV shielding agent; when the heavy calcium carbonate is mixed with the acrylic resin, the heavy calcium carbonate can be fully fused with the acrylic resin under the action of sodium hexametaphosphate, so that the problem of agglomeration of heavy calcium carbonate particles can be effectively avoided, and the problem of agglomeration of ferric oxide and titanium dioxide can be effectively avoided.

Description

Technical Field

[0001] This application relates to the field of shielding plate technology, and in particular to ultraviolet shielding plates and manufacturing methods. Background Technology

[0002] When plastic products are used outdoors, high-energy ultraviolet radiation irradiates the plastic surface, causing shallow polymer cross-linking, which affects the photochemical properties, biological properties, and mechanical strength of the plastic products, thereby affecting their service life and subsequent recycling. In particular, for plastic shielding panels used outdoors, ultraviolet aging will cause comprehensive aging of the material, rapidly reducing its outdoor service life.

[0003] Titanium dioxide can absorb ultraviolet rays in plastic shielding panels, but it tends to agglomerate during use, with particles clustering together to form small clumps. This reduces the contact area of ​​the titanium dioxide, hindering its full utilization. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing an ultraviolet shielding plate and its manufacturing method. The specific technical solution is as follows:

[0005] On the one hand, the ultraviolet shielding plate provided in this application includes the following components by weight: 50-70 parts acrylic resin, 15-30 parts sodium hexametaphosphate, 4-8 parts ultraviolet shielding agent, 1-5 parts silane coupling agent, 0.4-1 parts initiator, and 40-60 parts water.

[0006] The ultraviolet shielding agent is tetrabutyl titanate, ferric oxide and heavy calcium carbonate, and the mass ratio of tetrabutyl titanate, ferric oxide and heavy calcium carbonate is (2-6):(1-3):(5-10).

[0007] In the above technical solution, ferric oxide has the function of absorbing ultraviolet rays, and titanium dioxide formed by tetrabutyl titanate can also play one of the roles of absorbing ultraviolet rays. Heavy calcium carbonate can act as a carrier in the ultraviolet shielding agent, allowing ferric oxide and titanium dioxide to be adsorbed on the surface of heavy calcium carbonate particles. Heavy calcium carbonate can also act as a network skeleton in the ultraviolet shielding agent, providing good filling and accommodation space for ferric oxide and titanium dioxide. When heavy calcium carbonate is mixed with acrylic resin, it can be fully fused with acrylic resin under the action of sodium hexametaphosphate, which can not only improve the hardness of the shielding plate, but also effectively avoid the problem of heavy calcium carbonate particles agglomeration, thereby effectively avoiding the problem of ferric oxide and titanium dioxide agglomeration.

[0008] The components of ferric oxide, heavy calcium carbonate, and titanium dioxide not only analyze uniformly in the system, but also have excellent synergistic effects, enabling the shielding plate to achieve a significant UV protection effect.

[0009] As an improvement to the above technical solution, the average particle size of the ultraviolet shielding agent is 10nm to 20nm.

[0010] As an improvement to the above technical solution, the preparation method of the ultraviolet shielding agent is as follows: mix and stir the prescribed amount of tetrabutyl titanate and acetic acid at room temperature for 30 minutes. After stirring evenly, slowly add it dropwise to a mixture containing acetic acid and ethanol under magnetic stirring. After the addition is complete, continue the reaction to obtain a colorless and transparent titanium dioxide sol.

[0011] Weigh out the required amounts of ferric oxide and heavy calcium carbonate, disperse them in titanium dioxide sol under ultrasonication, immerse for 20 minutes, remove, wash, dry, calcine at 500℃ for 2 hours, and then grind to obtain the ultraviolet shielding agent.

[0012] As an improvement to the above technical solution, the dripping rate is 40 drops / min.

[0013] As an improvement to the above technical solution, the initiator is one of azobisisobutyronitrile and azobisisoheptanenitrile.

[0014] Secondly, this application provides a method for preparing the aforementioned shielding plate, comprising the following steps:

[0015] S1: Mix the acrylic resin, sodium hexametaphosphate, and water according to the formula, and heat;

[0016] S2: Add the prescribed amount of UV shielding agent and mix, then add the prescribed amount of initiator and silane coupling agent, and react for 2 hours;

[0017] S3: After the reaction, pour the mixture into a mold, keep it for 2-3 hours, and then dry it to obtain an ultraviolet shielding plate.

[0018] In step S1, the heating temperature is 120-150℃.

[0019] In summary, the present invention has at least one of the following beneficial technical effects:

[0020] Ferric oxide (Fe₂O₃) has the function of absorbing ultraviolet (UV) radiation, and titanium dioxide formed from tetrabutyl titanate can also serve as one of the components responsible for UV absorption. Heavy calcium carbonate acts as a carrier in the UV shielding agent, allowing ferric oxide and titanium dioxide to be adsorbed onto the surface of the heavy calcium carbonate particles. Heavy calcium carbonate also acts as a network framework in the UV shielding agent, providing good filling and accommodation space for ferric oxide and titanium dioxide. When heavy calcium carbonate is mixed with acrylic resin, under the action of sodium hexametaphosphate, it can be fully integrated with the acrylic resin, which not only improves the hardness of the shielding plate but also effectively avoids the problem of heavy calcium carbonate particle agglomeration. This effectively prevents the agglomeration of ferric oxide and titanium dioxide, and its uniform dispersion in the components increases the surface area of ​​the entire UV shielding agent particles, thereby improving the UV absorption effect of the shielding plate.

[0021] The components of ferric oxide, heavy calcium carbonate, and titanium dioxide not only analyze uniformly in the system, but also have excellent synergistic effects, enabling the shielding plate to achieve a significant UV protection effect. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] The ultraviolet shielding plate comprises the following components by weight: 50-70 parts acrylic resin, 15-30 parts sodium hexametaphosphate, 4-8 parts ultraviolet shielding agent, 1-5 parts silane coupling agent, 0.4-1 parts initiator, and 40-60 parts water.

[0024] The ultraviolet shielding agent is tetrabutyl titanate, ferric oxide and heavy calcium carbonate, and the mass ratio of tetrabutyl titanate, ferric oxide and heavy calcium carbonate is (2-6):(1-3):(5-10).

[0025] The average particle size of the ultraviolet shielding agent is 10 nm to 20 nm.

[0026] The preparation method of the ultraviolet shielding agent is as follows: mix and stir the prescribed amount of tetrabutyl titanate and acetic acid at room temperature for 30 minutes. After stirring evenly, slowly add it dropwise to a mixture containing acetic acid and ethanol under magnetic stirring. After the addition is complete, continue the reaction to obtain a colorless and transparent titanium dioxide sol.

[0027] Weigh out the required amounts of ferric oxide and heavy calcium carbonate, disperse them in titanium dioxide sol under ultrasonication, immerse for 20 minutes, remove, wash, dry, calcine at 500℃ for 2 hours, and then grind to obtain the ultraviolet shielding agent.

[0028] The dropping rate is 40 drops / min.

[0029] The initiator is one of azobisisobutyronitrile and azobisisoheptanenitrile.

[0030] The method for preparing an ultraviolet shielding plate includes the following steps:

[0031] S1: Mix the acrylic resin, sodium hexametaphosphate, and water according to the formula, and heat;

[0032] S2: Add the prescribed amount of UV shielding agent and mix, then add the prescribed amount of initiator and silane coupling agent, and react for 2 hours;

[0033] S3: After the reaction, pour the mixture into a mold, keep it for 2-3 hours, and then dry it to obtain an ultraviolet shielding plate.

[0034] In step S1, the heating temperature is 120-150℃.

[0035] Prior to this application, titanium dioxide was dispersed in a shielding plate to absorb ultraviolet light.

[0036] However, titanium dioxide exhibits a significant agglomeration phenomenon, with titanium dioxide particles clustering together to form small clumps. This reduces the contact area of ​​titanium dioxide, thus hindering its full utilization.

[0037] To address the aforementioned technical problems, the inventors of this application propose that heavy calcium carbonate can act as a carrier in ultraviolet (UV) shielding agents, allowing ferric oxide and titanium dioxide to be adsorbed onto the surface of the heavy calcium carbonate particles. Heavy calcium carbonate also acts as a network framework in the UV shielding agent, providing ample filling and accommodating space for ferric oxide and titanium dioxide. When heavy calcium carbonate is mixed with acrylic resin, under the action of sodium hexametaphosphate, it can fully fuse with the acrylic resin, not only improving the hardness of the shielding plate but also effectively preventing the agglomeration of heavy calcium carbonate particles. This effectively avoids the agglomeration of ferric oxide and titanium dioxide. Furthermore, its uniform dispersion in the components increases the surface area of ​​the entire UV shielding agent particles, thereby improving the UV absorption effect of the shielding plate.

[0038] Furthermore, because there are free hydroxyl groups on the surface of ferric oxide, silane coupling agents can be covalently grafted onto these free hydroxyl groups via alkoxy groups. This covalent grafting method can further improve the uniformity of ferric oxide in acrylic resin and the bonding strength between ferric oxide and ferric oxide, thereby improving the bonding strength between the ultraviolet shielding agent and other components.

[0039] Unless otherwise specified, all raw materials in this application are purchased from the market, including:

[0040] Silane coupling agent, purchased from Shandong Huachen New Materials Co., Ltd.

[0041] The present application will be further described in detail below with reference to the embodiments.

[0042] Preparation Example 1

[0043] In this preparation example, 2 kg of tetrabutyl titanate, 3 kg of ferric oxide, and 5 kg of heavy calcium carbonate were used.

[0044] Preparation Example 2

[0045] In this preparation example, 4 kg of tetrabutyl titanate, 2 kg of ferric oxide, and 7 kg of heavy calcium carbonate were used.

[0046] Preparation Example 3

[0047] In this preparation example, the amount of tetrabutyl titanate is 5 kg, the amount of ferric oxide is 1.5 kg, and the amount of heavy calcium carbonate is 9 kg.

[0048] Preparation Example 4

[0049] In this preparation example, 6 kg of tetrabutyl titanate, 1 kg of ferric oxide, and 10 kg of heavy calcium carbonate were used.

[0050] Preparation Example 5

[0051] In this preparation example, 4 kg of tetrabutyl titanate, 2 kg of ferric oxide, and 9 kg of heavy calcium carbonate were used.

[0052] Preparation Example 6

[0053] In this preparation example, 4 kg of tetrabutyl titanate, 1.5 kg of ferric oxide, and 9 kg of heavy calcium carbonate were used.

[0054] Preparation Example 7

[0055] In this preparation example, 5 kg of tetrabutyl titanate, 2 kg of ferric oxide, and 9 kg of heavy calcium carbonate were used. Specific Implementation

[0057] Example 1

[0058] Mix 50 kg of acrylic resin, 30 kg of sodium hexametaphosphate and 40 kg of water, and heat to 120°C.

[0059] Add 4 kg of the UV shielding agent from Preparation Example 1 and mix, then add 0.4 kg of initiator and 5 kg of silane coupling agent, and react for 2 h;

[0060] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0061] Example 2

[0062] Mix 60 kg of acrylic resin, 25 kg of sodium hexametaphosphate and 50 kg of water, and heat to 130 °C.

[0063] Add 5 kg of the UV shielding agent from Preparation Example 1 and mix, then add 0.6 kg of initiator and 4 kg of silane coupling agent, and react for 2 h;

[0064] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0065] Example 3

[0066] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0067] Add 7 kg of the UV shielding agent from Preparation Example 1 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0068] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate. Example 4

[0069] Mix 70 kg of acrylic resin, 15 kg of sodium hexametaphosphate and 60 kg of water, and heat to 150 °C.

[0070] Add 8 kg of the UV shielding agent from Preparation Example 1 and mix, then add 1 kg of initiator and 1 kg of silane coupling agent, and react for 2 h;

[0071] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate. Comparative Example 1

[0072] Mix 40 kg of acrylic resin, 35 kg of sodium hexametaphosphate and 30 kg of water, and heat to 130°C.

[0073] Add 3 kg of the UV shielding agent from Preparation Example 1 and mix, then add 0.2 kg of initiator and 6 kg of silane coupling agent, and react for 2 h;

[0074] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate. Comparative Example 2

[0075] Mix 75 kg of acrylic resin, 10 kg of sodium hexametaphosphate and 70 kg of water, and heat to 130 °C.

[0076] Add 9 kg of the UV shielding agent from Preparation Example 1 and mix, then add 1.2 kg of initiator and 0.5 kg of silane coupling agent, and react for 2 h;

[0077] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0078] The shielding plates prepared in Examples 1-4 and Comparative Examples 1-2 were tested for transmittance, mid-wave ultraviolet cutoff rate, and long-wave ultraviolet cutoff rate. For transmittance testing, a UV-Vis spectrophotometer from Shanghai Spectrum Instruments Co., Ltd. was used. The sample to be tested was directly installed between the detector and the light source. After centering, the sample was irradiated with the light source, and the transmittance was measured. The ultraviolet cutoff rate test measured the blocking effect on mid-wave ultraviolet rays with wavelengths of 280-320 nm and long-wave ultraviolet rays with wavelengths of 320-400 nm. The test results are shown in Table 1.

[0079] Table 1

[0080]

[0081]

[0082] In applications, the shielding plates prepared in Examples 1-4 of this invention exhibit a cutoff rate of over 94% for mid-wave ultraviolet radiation, over 90% for long-wave ultraviolet radiation, and over 85% transmittance for visible light. Ferric oxide (Fe₂O₃) has the function of absorbing ultraviolet radiation, and titanium dioxide formed from tetrabutyl titanate can also serve as one of the components responsible for ultraviolet radiation absorption. Heavy calcium carbonate acts as a carrier in the ultraviolet shielding agent, allowing ferric oxide and titanium dioxide to be adsorbed onto the surface of the heavy calcium carbonate particles. Heavy calcium carbonate also acts as a network framework in the ultraviolet shielding agent, providing good filling and accommodating space for ferric oxide and titanium dioxide. When heavy calcium carbonate is mixed with acrylic resin, under the action of sodium hexametaphosphate, it can fully fuse with the acrylic resin, not only improving the hardness of the shielding plate but also effectively preventing the agglomeration of heavy calcium carbonate particles. This effectively avoids the agglomeration of ferric oxide and titanium dioxide, and its uniform dispersion in the components increases the surface area of ​​the entire ultraviolet shielding agent particles, thereby improving the ultraviolet absorption effect of the shielding plate and effectively overcoming the agglomeration problem of titanium dioxide.

[0083] Furthermore, because there are free hydroxyl groups on the surface of ferric oxide, silane coupling agents can be covalently grafted onto these free hydroxyl groups via alkoxy groups. This covalent grafting method can further improve the uniformity of ferric oxide in acrylic resin and the bonding strength between ferric oxide and ferric oxide, thereby improving the bonding strength between the ultraviolet shielding agent and other components.

[0084] In this application, the proportions of ferric oxide, tetrabutyl titanate, and heavy calcium carbonate have a synergistic effect. Based on this, this application designs Examples 5-10 based on Example 2. In Examples 5-10, everything remains the same except for the proportions of ferric oxide, tetrabutyl titanate, and heavy calcium carbonate, and the preparation method is also unchanged, as detailed below.

[0085] Example 5

[0086] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0087] Add 7 kg of the UV shielding agent from Preparation Example 2 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0088] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0089] Example 6

[0090] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0091] Add 7 kg of the UV shielding agent from Preparation Example 3 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0092] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0093] Example 7

[0094] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0095] Add 7 kg of the UV shielding agent from Preparation Example 4 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0096] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0097] Example 8

[0098] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0099] Add 7 kg of the UV shielding agent from Preparation Example 5 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0100] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0101] Example 9

[0102] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0103] Add 7 kg of the UV shielding agent from Preparation Example 6 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0104] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0105] Example 10

[0106] Mix 65kg of acrylic resin, 20kg of sodium hexametaphosphate and 55kg of water, and heat to 150℃.

[0107] Add 7 kg of the UV shielding agent from Preparation Example 7 and mix, then add 0.8 kg of initiator and 3 kg of silane coupling agent, and react for 2 h;

[0108] After the reaction, the mixture is poured into a mold and kept for 2-3 hours before drying to obtain an ultraviolet shielding plate.

[0109] The shielding plates prepared in Examples 5-10 above were tested for transmittance, mid-wave ultraviolet cutoff rate, and long-wave ultraviolet cutoff rate. For transmittance testing, a UV-Vis spectrophotometer from Shanghai Spectrum Instruments Co., Ltd. was used. The sample to be tested was directly installed between the detector and the light source. After centering, the sample was irradiated with the light source, and the transmittance was measured. The ultraviolet cutoff rate test measured the blocking effect of mid-wave ultraviolet light with wavelengths of 280-320nm and long-wave ultraviolet light with wavelengths of 320-400nm. The results are shown in Table 2.

[0110]

[0111] Table 2

[0112] As can be seen from the test results in Table 2 above, the test results of Examples 6, 8, 9 and 10 are better. That is, when the mass ratio of tetrabutyl titanate, ferric oxide and heavy calcium carbonate is (4-5):(2-1.5):9, the shielding plate has a cutoff rate of more than 96% for medium-wave ultraviolet rays, a cutoff rate of more than 92% for long-wave ultraviolet rays, and a transmittance of more than 87% for visible light. The components of ferric oxide, heavy calcium carbonate and titanium dioxide are not only uniformly analyzed in the system, but also have excellent synergistic effects, which makes the shielding plate have a significant effect on preventing ultraviolet rays. Furthermore, because there are free hydroxyl groups on the surface of ferric oxide, the silane coupling agent is covalently grafted onto these free hydroxyl groups through alkoxy groups. This covalent grafting method can further improve the uniformity of ferric oxide and acrylic resin and the bonding strength between ferric oxide and ferric oxide, thereby improving the bonding strength between the ultraviolet shielding agent and other components.

[0113] The particle size of the ultraviolet shielding agent in this application affects the shielding plate. Based on this, this application designs Examples 11-14 based on Example 6. In Examples 11-14, everything remains the same except for the particle size of the ultraviolet shielding agent, and the manufacturing method is also unchanged. The details are as follows, see Table 3.

[0114] Particle size (nm) of ultraviolet shielding agents Example 11 10 Example 12 13 Example 13 17 Example 14 20

[0115] Table 3

[0116] The shielding plates prepared in Examples 11-14 above were tested for transmittance, mid-wave ultraviolet cutoff rate, and long-wave ultraviolet cutoff rate. For transmittance testing, a UV-Vis spectrophotometer from Shanghai Spectrum Instruments Co., Ltd. was used. The sample to be tested was directly installed between the detector and the light source. After centering, the sample was irradiated with the light source, and the transmittance was measured. The ultraviolet cutoff rate test was conducted on the blocking of mid-wave ultraviolet rays with wavelengths of 280-320 nm and long-wave ultraviolet rays with wavelengths of 320-400 nm. The results are shown in Table 4.

[0117]

[0118]

[0119] Table 4

[0120] As can be seen from the test results in Table 4 above, the test results of Example 13 are superior. That is, when the particle size of the ultraviolet shielding agent is 12-17nm, the cutoff rate of the shielding plate for mid-wave ultraviolet rays is higher than 97%, the cutoff rate for long-wave ultraviolet rays is higher than 92%, and the transmittance of visible light is also higher than 87.6%. The larger the particle size, the smaller the specific surface area, which affects the absorption effect of ultraviolet rays. However, if the particle size is too small, although the specific surface area is large, it is more likely to agglomerate. Therefore, when the particle size of the ultraviolet shielding agent is 12-17nm, the shielding plate will have a significant ultraviolet protection effect, extend the service life of the shielding plate, and effectively avoid the problem of comprehensive aging of materials caused by ultraviolet aging, which will rapidly reduce its outdoor service life.

[0121] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An ultraviolet shielding plate, characterized in that, It includes the following components by weight: 50-70 parts acrylic resin, 15-30 parts sodium hexametaphosphate, 4-8 parts ultraviolet shielding agent, 1-5 parts silane coupling agent, 0.4-1 parts initiator, and 40-60 parts water; The ultraviolet shielding agent is tetrabutyl titanate, ferric oxide and heavy calcium carbonate, and the mass ratio of tetrabutyl titanate, ferric oxide and heavy calcium carbonate is (2-6): (1-3): (5-10). The average particle size of the ultraviolet shielding agent is 10 nm to 20 nm. The preparation method of the ultraviolet shielding agent is as follows: mix and stir the prescribed amount of tetrabutyl titanate and acetic acid at room temperature for 30 minutes. After stirring evenly, slowly add it dropwise to a mixture containing acetic acid and ethanol under magnetic stirring. After the addition is complete, continue the reaction to obtain a colorless and transparent titanium dioxide sol. Weigh out the required amounts of ferric oxide and heavy calcium carbonate, disperse them in titanium dioxide sol under ultrasonication, immerse for 20 minutes, remove, wash, dry, calcine at 500℃ for 2 hours, and then grind to obtain the ultraviolet shielding agent.

2. The ultraviolet shielding plate according to claim 1, characterized in that, The dropping rate is 40 drops / min.

3. The ultraviolet shielding plate according to claim 1, characterized in that, The initiator is one of azobisisobutyronitrile and azobisisoheptanenitrile.

4. The method for preparing an ultraviolet shielding plate according to claim 1, characterized in that, Includes the following steps: S1: Mix the acrylic resin, sodium hexametaphosphate, and water according to the formula, and heat; S2: Add the prescribed amount of UV shielding agent and mix, then add the prescribed amount of initiator and silane coupling agent, and react for 2 hours; S3: After the reaction, pour the mixture into a mold, keep it for 2-3 hours, and then dry it to obtain an ultraviolet shielding plate.

5. The method for preparing an ultraviolet shielding plate according to claim 4, characterized in that, In step S1, the heating temperature is 120-150℃.

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