A thin-walled antistatic flame-retardant light-diffusing PC material and its preparation method

Abstract

The present invention discloses a thin-walled antistatic flame-retardant light-diffusing PC material, which comprises the following components in percentage by weight: 95%-98% of PC resin, 1%-3% of antistatic agent, 0.1%-0.3% of flame retardant, 0.1%-0.3% of light diffusing agent, 0.1%-0.5% of antioxidant, and 0.1%-0.5% of lubricant. Among them, the antistatic agent is a n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid type antistatic agent. This ionic antistatic agent has a better binding effect with the PC substrate. One end of it is firmly "buried" in the PC substrate, and the other end is close to the substrate surface, enabling the substrate to have a good permanent antistatic effect. At the same time, the ionic liquid antistatic agent of the present invention exhibits antistatic effect through ionic conductivity, and it can be not affected by the use environment. Even in a dry environment, it can exhibit excellent antistatic property; and this ionic liquid antistatic agent has a relatively high decomposition temperature, which can meet the requirements of co-extrusion and injection molding, making the preparation process of the PC material simpler and the cost lower.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer materials, and particularly relates to a thin-wall antistatic flame-retardant light-diffusing PC material and a preparation method thereof. Background Art

[0002] The PC light-diffusing plate is also called polycarbonate light-diffusing plate, also known as PC diffusing plate, PC light homogenizing plate, PC diffusive reflection plate, etc. It is an optical sheet made with polycarbonate (hereinafter referred to as PC) as the base material and added with a light diffusing agent. It can make light pass through evenly without exposing the light source, thus achieving a special effect of "translucent but not transparent". Currently, it has been widely used in industries such as construction, industry, lighting, decoration, etc.

[0003] However, currently, more attention is paid to the light diffusion effect of the PC light-diffusing plate during its preparation, which results in its inability to be widely used in some special industrial sectors. For example, in industries such as electronic components, production of flammable and explosive chemicals, etc., higher requirements are put forward for the light-diffusing plate. It not only requires the PC light-diffusing plate to have excellent "translucent but not transparent" effect to ensure the protection of the company's production secrets on the premise of sufficient light to complete production tasks; at the same time, it also needs to have excellent flame-retardant effect to ensure that the flame propagation speed can be reduced in case of a fire or even have the effect of self-extinguishing in the face of a small fire, so as to achieve the effect of protecting the lives and property safety of production personnel and the entire company; most importantly, it must have excellent antistatic effect. On the one hand, it can effectively reduce the reduction of the light transmittance of the PC light-diffusing plate caused by dust adsorption and maintain a dust-free environment in the workshop. On the other hand, it can also effectively prevent safety problems such as fires and explosions caused by static electricity.

[0004] In the prior art, generally, flame retardants and antistatic agents are added to improve the flame retardancy and antistatic effect of the PC light-diffusing plate. However, currently, conventional antistatic agents will seriously affect the light transmittance of the PC light-diffusing plate after being added to it. To this end, the currently widely used method to improve the antistatic effect of the PC light-diffusing plate is to spray a water-soluble surfactant on the surface of the PC light-diffusing plate to improve its antistatic property. Spraying a water-soluble surfactant can not only improve the antistatic effect of the PC light-diffusing plate, but also keep the PC light-diffusing plate having a high light transmittance. However, since the water-soluble surfactant is attached to the surface of the PC light-diffusing plate by spraying, with the prolongation of the use time, the surfactant will migrate continuously, so that the antistatic property of the PC light-diffusing plate can generally be maintained for half a year to one year, thus unable to meet people's needs. Summary of the Invention

[0005] The present invention aims to solve the technical problem that the antistatic effect of PC light diffusing plates in the prior art lasts for a relatively short time; a thin-walled antistatic and flame-retardant light diffusing PC material and a preparation method thereof are provided to obtain a PC light diffusing plate with a permanent antistatic effect.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A thin-walled antistatic and flame-retardant light diffusing PC material, comprising the following components in percentage by weight:

[0008]

[0009] Among them, the antistatic agent is a n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid type antistatic agent.

[0010] Further, the PC resin used is a PC resin with a melt flow rate of 8 - 12 g / 10 min and an impact of 40 - 50 KJ / m under the test conditions of 300 °C and 1.2 kg. 2

[0011] Further, the flame retardant is any one or any mixture of two or more of brominated flame retardants, phosphonate flame retardants, or sulfonate flame retardants in any ratio.

[0012] Further, the flame retardant is a perfluoroalkyl sulfonate flame retardant.

[0013] Further, the light diffusing agent is an organosilicon-modified acrylate polymer.

[0014] Further, the antioxidant is a mixture of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1.

[0015] Further, the lubricant is any one or any mixture of two or more of EBS, PETS, and silicone masterbatch in any ratio.

[0016] A preparation method of a thin-walled antistatic and flame-retardant light diffusing PC material, comprising the following steps:

[0017] Step 1: Weigh PC resin, antistatic agent, flame retardant, light diffusing agent, antioxidant, and lubricant according to the percentage by weight; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material.

[0018] Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude it.

[0019] Further, the screw rotation speed of the twin-screw extruder in Step 2 is 400 r / min - 600 r / min. ​

[0020] Further, the temperatures of each zone of the twin-screw extruder in Step 2 are as follows: Zone 1: 100°C, Zone 2: 200°C, Zone 3: 230°C, Zone 4: 240°C, Zone 5: 240°C, Zone 6: 230°C, Zone 7: 230°C, Zone 8: 230°C, Zone 9: 230°C, Zone 10: 240°C, and the head temperature: 240°C.

[0021] The beneficial effects of the present invention are as follows:

[0022] 1. The antistatic agent used in the present invention is an ionic liquid type antistatic agent of n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt, which has a better binding effect with the PC substrate. One end of the ionic antistatic agent is firmly "embedded" in the PC substrate, and the other end is close to the substrate surface, thereby enabling the substrate to have good permanent antistatic properties. At the same time, different from the characteristic of the surfactant in the prior art that shows conductivity by absorbing moisture in the air, the ionic liquid antistatic agent of the present invention shows antistatic properties through ionic conductivity, and it can be not affected by the use environment. Even in a dry environment, it can show excellent antistatic properties; and this ionic liquid antistatic agent has a relatively high decomposition temperature, which can meet the requirements of co-extrusion and injection molding, making the preparation process of the PC material simpler and the cost lower.

[0023] 2. The flame retardant used in the present invention is a perfluorinated alkyl sulfonate flame retardant. This flame retardant can not only keep the transparency of the PC material above 80% and the haze around 30%, but also ensure that it can meet the 1.6mm V0 requirement of the UL94 flame retardancy test. That is, the finally obtained PC light diffusing sheet has both excellent light diffusing properties and flame retardant properties. Specific Embodiments

[0024] The embodiments of the present invention provide a thin-wall antistatic flame-retardant light-diffusing PC material and its preparation method to solve the technical problem that the antistatic effect of the PC light diffusing plate in the prior art has a short duration.

[0025] The general idea adopted by the present invention is as follows:

[0026] A thin-wall antistatic flame-retardant light-diffusing PC material comprises the following components in percentage by weight: 95%-98% of PC resin, 1%-3% of antistatic agent, 0.1%-0.3% of flame retardant, 0.1%-0.3% of light diffusing agent, 0.1%-0.5% of antioxidant, and 0.1%-0.5% of lubricant. Among them, the antistatic agent is an ionic liquid type antistatic agent of n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt.

[0027] Compared with the conventional antistatic agents commonly used in plastic materials in the prior art, such as conductive carbon black, carbon fiber, and carbon nanotubes, the use of liquid ionic antistatic agents can not only improve the antistatic effect of the material, but also ensure the light diffusion performance of the PC material. In the embodiment of the present invention, when the n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid antistatic agent is mixed with the PC resin, one end is firmly "embedded" in the PC substrate, and the other end is close to the substrate surface, so that the substrate has a good permanent antistatic effect. At the same time, different from the surfactant in the prior art that exhibits conductivity by absorbing moisture in the air, the ionic liquid antistatic agent of the present invention exhibits antistatic effect through ionic conductivity, and it can be not affected by the use environment. Even in a dry environment, it can exhibit excellent antistatic properties; and this ionic liquid antistatic agent has a relatively high decomposition temperature, which can meet the requirements of co-blending extrusion and injection molding, making the preparation process of the PC material simpler and the cost lower.

[0028] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains.

[0029] The "first", "second" and similar terms used in the description and claims of this patent application for the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "a", "an" or "the" and similar terms do not denote a limitation of quantity, but rather indicate the presence of at least one. The terms "including" or "comprising" and the like are intended to mean that the elements or items appearing before "including" or "comprising" cover the features, wholes, steps, operations, elements and / or components listed after "including" or "comprising", and do not exclude the existence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations. The terms "upper", "lower", "left", "right" and the like are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] Example 1

[0031] A thin-walled antistatic flame-retardant light-diffusing PC material, comprising the following components in weight percentages: 97.8% of PC resin, 1% of antistatic agent, 0.1% of flame retardant, 0.3% of light diffusing agent, 0.4% of antioxidant, and 0.4% of lubricant. Among them, the PC resin is the PC resin of model S-2000F made by the phosgene process. The antistatic agent is a n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid type antistatic agent. The flame retardant is a perfluorinated alkyl sulfonate flame retardant FR-2025. The light diffusing agent is an organosilicon-modified acrylate light diffusing agent 30-424. The antioxidant is a mixture composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1. The lubricant is PETS.

[0032] Based on the above, a preparation method of a thin-walled antistatic flame-retardant light-diffusing PC material comprises the following steps:

[0033] Step 1: Weigh PC resin, antistatic agent, flame retardant, light diffusing agent, antioxidant, and lubricant according to the weight percentages; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material;

[0034] Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude to obtain the thin-walled antistatic flame-retardant light-diffusing PC material.

[0035] Among them, the screw speed of the twin-screw extruder is 600 r / min. The temperatures of each zone of the twin-screw extruder are: Zone 1: 100 °C, Zone 2: 200 °C, Zone 3: 230 °C, Zone 4: 240 °C, Zone 5: 240 °C, Zone 6: 230 °C, Zone 7: 230 °C, Zone 8: 230 °C, Zone 9: 230 °C, Zone 10: 240 °C, and the head temperature is 240 °C.

[0036] Example 2

[0037] A thin-walled antistatic flame-retardant light-diffusing PC material, comprising the following components in weight percentages: 96.8% of PC resin, 2% of antistatic agent, 0.2% of flame retardant, 0.2% of light diffusing agent, 0.4% of antioxidant, and 0.4% of lubricant. Among them, the PC resin is the PC resin of model S-2000F made by the phosgene process. The antistatic agent is a n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid type antistatic agent. The flame retardant is a perfluorinated alkyl sulfonate flame retardant FR-2025. The light diffusing agent is an organosilicon-modified acrylate light diffusing agent 30-424. The antioxidant is a mixture composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1. The lubricant is EBS.

[0038] Based on the above, a preparation method of a thin-walled antistatic flame-retardant light-diffusing PC material comprises the following steps:

[0039] Step 1: Weigh PC resin, antistatic agent, flame retardant, light diffusing agent, antioxidant and lubricant by weight percentage; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material;

[0040] Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude to obtain a thin-wall antistatic flame-retardant light-diffusing PC material.

[0041] Among them, the screw speed of the twin-screw extruder is 500 r / min. The temperatures of each zone of the twin-screw extruder are as follows: Zone 1: 100 °C, Zone 2: 200 °C, Zone 3: 230 °C, Zone 4: 240 °C, Zone 5: 240 °C, Zone 6: 230 °C, Zone 7: 230 °C, Zone 8: 230 °C, Zone 9: 230 °C, Zone 10: 240 °C, and the head temperature is 240 °C.

[0042] Example 3

[0043] A thin-wall antistatic flame-retardant light-diffusing PC material, comprising the following components by weight percentage: 95.8% of PC resin, 3% of antistatic agent, 0.3% of flame retardant, 0.1% of light diffusing agent, 0.4% of antioxidant, and 0.4% of lubricant. Among them, the PC resin is PC resin of model S-2000F made by the phosgene process. The antistatic agent is a n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid type antistatic agent. The flame retardant is a perfluorinated alkyl sulfonate flame retardant FR-2025. The light diffusing agent is an organosilicon-modified acrylate light diffusing agent 30-424. The antioxidant is a mixture of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1. The lubricant is a silicone masterbatch.

[0044] Based on the above preparation method of a thin-wall antistatic flame-retardant light-diffusing PC material, it includes the following steps:

[0045] Step 1: Weigh PC resin, antistatic agent, flame retardant, light diffusing agent, antioxidant and lubricant by weight percentage; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material;

[0046] Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude to obtain a thin-wall antistatic flame-retardant light-diffusing PC material. <s

[0047] Among them, the screw speed of the twin-screw extruder is 500 r / min. The temperatures of each zone of the twin-screw extruder are as follows: Zone 1: 100 °C, Zone 2: 200 °C, Zone 3: 230 °C, Zone 4: 240 °C, Zone 5: 240 °C, Zone 6: 230 °C, Zone 7: 230 °C, Zone 8: 230 °C, Zone 9: 230 °C, Zone 10: 240 °C, and the head temperature is 240 °C.

[0048] Comparative Example 1

[0049] A light-diffusing PC material, comprising the following components in weight percentages: 98.8% of PC resin, 0.1% of flame retardant, 0.3% of light diffusing agent, 0.4% of antioxidant, and 0.4% of lubricant. Among them, the PC resin is the PC resin of model S-2000F made by the phosgene process. The flame retardant is the perfluorinated alkyl sulfonate flame retardant FR-2025. The light diffusing agent is the silicone-modified acrylate light diffusing agent 30-424. The antioxidant is a mixture composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1. The lubricant is PETS.

[0050] Based on the above, a preparation method of a thin-wall antistatic flame-retardant light-diffusing PC material comprises the following steps:

[0051] Step 1: Weigh PC resin, flame retardant, light diffusing agent, antioxidant, and lubricant according to weight percentages; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material;

[0052] Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude to obtain a thin-wall antistatic flame-retardant light-diffusing PC material.

[0053] Among them, the screw speed of the twin-screw extruder is 600 r / min. The temperatures of each zone of the twin-screw extruder are: Zone 1: 100 °C, Zone 2: 200 °C, Zone 3: 230 °C, Zone 4: 240 °C, Zone 5: 240 °C, Zone 6: 230 °C, Zone 7: 230 °C, Zone 8: 230 °C, Zone 9: 230 °C, Zone 10: 240 °C, and the head temperature is 240 °C.

[0054] The difference between this Comparative Example 1 and the above Example 1 is that no antistatic agent is added.

[0055] Comparative Example 2

[0056] A thin-wall antistatic flame-retardant light-diffusing PC material, comprising the following components in weight percentages: 96.1% of PC resin, 3% of antistatic agent, 0.1% of light diffusing agent, 0.4% of antioxidant, and 0.4% of lubricant. Among them, the PC resin is the PC resin of model S-2000F made by the phosgene process. The antistatic agent is the n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid type antistatic agent. The light diffusing agent is the silicone-modified acrylate light diffusing agent 30-424. The antioxidant is a mixture composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:1. The lubricant is a silicone masterbatch.

[0057] Based on the above, a preparation method of a thin-wall antistatic flame-retardant light-diffusing PC material comprises the following steps:

[0058] Step 1: Weigh PC resin, antistatic agent, flame retardant, light diffusing agent, antioxidant and lubricant by weight percentage; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material.

[0059] Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude to obtain a thin-wall antistatic flame-retardant light-diffusing PC material.

[0060] Among them, the screw speed of the twin-screw extruder is 500 r / min. The temperatures of each zone of the twin-screw extruder are as follows: Zone 1: 100 °C, Zone 2: 200 °C, Zone 3: 230 °C, Zone 4: 240 °C, Zone 5: 240 °C, Zone 6: 230 °C, Zone 7: 230 °C, Zone 8: 230 °C, Zone 9: 230 °C, Zone 10: 240 °C, and the head temperature is 240 °C.

[0061] The difference between this Comparative Example 2 and the above Example 3 is that no flame retardant is added.

[0062] Comparative Example 3

[0063] Commercially available antistatic flame-retardant PC light-diffusing sheet.

[0064] Performance detection test

[0065] In order to better verify the various performances of the light-diffusing PC materials obtained in the above Examples 1-3, the light-diffusing PC materials obtained in the above Examples 1-3 and Comparative Examples 1-3 are now tested for density, melt flow rate, tensile strength, impact strength, flexural strength, flexural modulus, UL94 (1.6 mm), light transmittance, haze and resistivity, etc. Among them, the test standard for the density is ISO1183, and it is measured by the drainage method; the test standard for the melt flow rate is ISO1183, and the test conditions are 260 °C and 5 kg; the test standard for the tensile strength is ISO527, the specimen is a Type 1 specimen, and the tensile speed during the test is 10 mm / min; the test standard for the impact strength is ISO180, which is the Izod notched impact strength; the test standards for the flexural strength and flexural modulus are ISO178, and the flexural speed during the test is 2 mm / min; the test standards for the light transmittance and haze are ISO13468-2, and the thickness of the specimen during the test is 2 mm; the test standard for the resistivity is ASTM D-257. The test results are shown in the following table:

[0066] Table 1 Performance detection results of the light-diffusing PC materials obtained in each example and comparative example

[0067]

[0068]

[0069] As can be seen from the test results of Examples 1-3 in the above table, the light-diffusing PC material obtained in the embodiments of the present invention not only has excellent antistatic and flame-retardant effects, but also has a light transmittance of more than 80% and a haze of about 30%, that is, it also has good light-transmitting effects at the same time.

[0070] By comparing the test results of Example 1 of the present invention and Comparative Example 1, it can be seen that adding the antistatic agent of the present invention can effectively improve the antistatic effect of the light-diffusing PC material. At the same time, adding the antistatic agent of the present invention does not affect other properties of the light-diffusing PC material, such as light transmittance, haze, flame retardancy, and other mechanical properties.

[0071] By comparing the test results of Example 3 of the present invention and Comparative Example 2, it can be seen that adding the flame retardant of the present invention can effectively improve the flame-retardant effect of the light-diffusing PC material. At the same time, adding the flame retardant of the present invention does not affect other properties of the light-diffusing PC material, such as light transmittance, haze, antistatic property, and other mechanical properties.

[0072] By comparing the test results of Examples 1-3 and Comparative Example 3, it can be seen that the antistatic performances of Examples 1-3 and Comparative Example 3 were basically the same at the beginning. After one year, the resistivity of Examples 1-3 did not change, while the antistatic performance of Comparative Example 3 increased significantly. This shows that the antistatic effect of the light-diffusing PC material obtained in Examples 1-3 of the present invention has good persistence.

[0073] Finally, it should be noted that these embodiments are only used to illustrate the present invention and do not limit the scope of the present invention. In addition, for those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the embodiments here. And the obvious changes or modifications derived therefrom still fall within the protection scope of the present invention.

Claims

1. A thin-walled antistatic flame-retardant light-diffusing PC material, characterized in that, Comprising components in the following weight percentages: Among them, the antistatic agent is a n-butylphosphonium bis(trifluoromethanesulfonyl)imide salt ionic liquid-type antistatic agent; the flame retardant is a perfluoroalkyl sulfonate flame retardant; The light diffusing agent is a silicone-modified acrylate polymer; The preparation method of the thin-wall antistatic and flame-retardant light diffusing PC material is characterized by comprising the following steps: Step 1: Weigh PC resin, antistatic agent, flame retardant, light diffusing agent, antioxidant and lubricant according to parts by weight; add the weighed materials into a high-speed mixer and mix evenly to obtain a mixed material; Step 2: Add the mixed material obtained in Step 1 into a twin-screw extruder and extrude.

2. The thin-walled antistatic flame-retardant light-diffusing PC material according to claim 1, wherein: The PC resin used has a melt flow rate of 8 - 12 g / 10 min at a test condition of 300 °C and 1.2 kg, and an impact of 40 - 50 KJ / m 2 of the PC resin.

3. The thin-walled antistatic flame-retardant light-diffusing PC material according to claim 1, wherein: The antioxidant is a mixture composed of antioxidant 1076 and antioxidant 168 in a mass ratio of 1:

1.

4. The thin-wall antistatic flame-retardant light-diffusing PC material according to claim 1, wherein: The lubricant is a mixture composed of any one or any two or more of EBS, PETS, and silicone masterbatch in any ratio.

5. The thin-wall antistatic flame-retardant light-diffusing PC material according to claim 1, wherein: The screw speed of the twin-screw extruder in Step 2 is 400 r / min - 600 r / min.

6. The thin-wall antistatic flame-retardant light-diffusing PC material according to claim 1, wherein: The temperatures of each zone of the twin-screw extruder in Step 2 are: Zone 1: 100 °C, Zone 2: 200 °C, Zone 3: 230 °C, Zone 4: 240 °C, Zone 5: 240 °C, Zone 6: 230 °C, Zone 7: 230 °C, Zone 8: 230 °C, Zone 9: 230 °C, Zone 10: 240 °C, and the head temperature is 240 °C.

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