Halogen-free and fluorine-free environment-friendly flame-retardant PC composite material with light diffusion effect

Abstract

The application is a halogen-free and fluorine-free environment-friendly flame-retardant PC composite material with light diffusion effect, comprising: PC, 90-99.78 parts by mass; light diffuser, 0.2-5 parts by mass; flame retardant, 0.01-3 parts by mass; antioxidant, 0.01-2 parts by mass; the light diffuser is polytetrafluoroethylene, the PC used in the application is recycled material PCR-PC (>=98%), and the treatment method is physical type, which reduces carbon dioxide emission and energy consumption; the light diffuser polytetrafluoroethylene used in the application has a small addition amount, significantly improves the light diffusion effect, does not affect the mechanical, mechanical and flame-retardant properties of the PC composite material, realizes the light transmittance of 80-90% and the haze of >80% of the composite material (thickness 2.0mm); the flame retardant and the light diffuser polytetrafluoroethylene used in the application are halogen-free and fluorine-free materials, which are environment-friendly, do not cause secondary pollution to the environment, and do not affect human health; the method for improving the light diffusion effect of the PC composite material is simple and easy to implement, and the production cost is low.

Description

[Technical Field]

[0001] This invention relates to the field of composite material technology, and in particular to a halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect. [Background Technology]

[0002] With the rapid development of the display industry, LED lighting products have become increasingly mature and stable. Product requirements have shifted from high luminous efficiency and low cost to high light quality and light health. As a companion to LED light sources, the development trend of lampshade materials must keep pace with the rapid improvement of light quality and light health. The most common energy-saving LEDs are point light sources with high light intensity. If ordinary glass or transparent resin is used for the lampshade, prolonged use can cause irreversible damage to the eyes. Therefore, materials with light-diffusing properties have become a hot topic.

[0003] Polycarbonate (PC) has high light transmittance, making it one of the light diffusing agents with inherent advantages and the widest application prospects. However, PC's flame retardancy rating is UL94V-2, and it drips flammable cotton when exposed to fire, posing a safety hazard. A common method to improve the flame retardancy of PC is to use a combination of halogenated flame retardants and anti-dripping agents containing polytetrafluoroethylene (PTFE). Although halogenated flame retardants significantly improve flame retardancy, are low in cost, and can improve the material's anti-aging properties, they produce a large amount of toxic gases and harmful substances, which are detrimental to the environment and health.

[0004] PFAS (per- and polyfluoroalkyl substances) are a class of chemical substances in which hydrogen atoms in a carbon chain are completely or partially replaced by fluorine atoms. Due to their potential harm and impact on health and the environment, a series of control measures for PFAS compounds have been introduced around the world in recent years.

[0005] Materials used for energy-saving lamp shades must possess excellent light refraction, reflection, scattering, and transmission properties. This places stringent requirements on the materials themselves. Currently, the common method on the market is to add inorganic or metal oxide micropowders, microspheres, nanoparticles, etc. However, the addition of these materials can affect the flame retardancy and mechanical properties of PC. In addition, these materials themselves are opaque, which will result in a loss of some lighting performance.

[0006] In view of this, it is necessary to provide a halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect to solve the above problems. [Summary of the Invention]

[0007] The technical problem this invention aims to solve is as follows: Common energy-saving LEDs are point light sources with high light intensity. If the lampshade material is ordinary glass or transparent resin, prolonged use can cause irreversible damage to the eyes. When using high-transmittance PC, its flame retardant performance is low. A common method to improve flame retardancy is to combine halogen-containing flame retardants with polytetrafluoroethylene-containing anti-drip agents. However, while this significantly improves flame retardancy, it produces large amounts of toxic gases and harmful substances, which are detrimental to the environment and health. Furthermore, the conventional method for using materials for energy-saving lampshades involves adding inorganic or metal oxide micropowders, microspheres, and nanoparticles. However, the addition of these materials affects the flame retardant and mechanical properties of PC, and these materials themselves are opaque, resulting in a loss of some lighting performance. Therefore, this invention provides a halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect to solve the above problems.

[0008] The solution to the technical problem of this invention is:

[0009] A halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light-diffusing effect, characterized in that it comprises the following components in parts by weight:

[0010] PC, 90–99.78 parts by weight;

[0011] Light diffusing agent, 0.2–5 parts by weight;

[0012] Flame retardant, 0.01 to 3 parts by weight;

[0013] Antioxidant, 0.01 to 2 parts by weight;

[0014] The light diffusing agent is polytetrafluoroethylene.

[0015] The selected PC is one or more of the following: bisphenol A type polycarbonate, polyester type polycarbonate, organosilicon copolymer PC, cyclohexane bisphenol A type polycarbonate, and high-temperature resistant polycarbonate synthesized from bisphenol TMC. The melt mass flow rate MI of the PCR-PC is (10-50) g / 10 min (300℃ / 1.2 kg), the weight average molecular weight is 20,000-50,000, and the molecular weight distribution is 1-2.5.

[0016] The selected flame retardant includes one or more of the following flame retardants in combination and use: hypophosphite flame retardant, phosphate ester flame retardant, sulfonate flame retardant, organosilicon flame retardant, and phosphazene flame retardant.

[0017] The selected antioxidants are one or more of hindered phenolic, phosphite, and thiolated antioxidants, in combination and use.

[0018] A product characterized in that it is prepared by using PC and processing aids to obtain a halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect.

[0019] The beneficial effects of this invention are:

[0020] 1. The PC used in this invention is recycled PCR-PC (≥98%), which is recycled from daily production and life, such as drinking water bottles, CDs, car headlight housings, etc. The treatment methods are all physical, which reduces carbon dioxide emissions and energy consumption.

[0021] 2. The light diffusing agent polytetrafluoroethylene used in this invention has the advantages of low addition amount, significant improvement of light diffusion effect, and beautiful effect similar to starry sky, while not affecting the mechanical, mechanical and flame retardant properties of PC composite material, achieving a light transmittance of 80-90% and haze >80% for composite material (thickness 2.0mm).

[0022] 3. The flame retardant and light diffusing agent polytetrafluoroethylene used in this invention are both halogen-free and fluorine-free materials, which are environmentally friendly and comply with national and international regulations, represented by the European Union. They will not cause secondary pollution to the environment and there is no need to worry about the impact on human health.

[0023] 4. The method for improving the light diffusion effect of PC composite materials in this invention is simple and easy to implement. The desired finished particle material can be obtained by processing a mixture of PC and several processing aids through a single screw extruder, and the production cost is low.

Detailed Implementation Methods

[0024] To further illustrate the technical means and effects of the present invention, the following detailed description is provided in conjunction with embodiments of the present invention.

[0025] This invention provides a halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, characterized in that it comprises the following components in parts by weight:

[0026] PC, 90–99.78 parts by weight;

[0027] Light diffusing agent, 0.2–5 parts by weight;

[0028] Flame retardant, 0.01 to 3 parts by weight;

[0029] Antioxidant, 0.01 to 2 parts by weight;

[0030] The light diffusing agent is polytetrafluoroethylene.

[0031] The selected PC is one or more of the following: bisphenol A type polycarbonate, polyester type polycarbonate, organosilicon copolymer PC, cyclohexane bisphenol A type polycarbonate, and high-temperature resistant polycarbonate synthesized from bisphenol TMC. The melt mass flow rate MI of the PCR-PC is (10-50) g / 10 min (300℃ / 1.2 kg), the weight average molecular weight is 20,000-50,000, and the molecular weight distribution is 1-2.5. The PCR-PC comes from daily production and life, such as broken lamp shells recovered by physical methods.

[0032] The selected flame retardants include one or more of the following flame retardants in combination and use: hypophosphite flame retardants (e.g., vinyl aluminum hypophosphite, vinyl hypophosphite), phosphate ester flame retardants (e.g., 1,3-phenylene phosphate (2,6-tolyl) tetraester, tetraphenyl bisphenol A diphosphate and its derivatives flame retardants (BDP), tetraphenyl resorcinol diphosphate and its derivatives (RDP) flame retardants, triphenyl phosphate (TPP) flame retardants), sulfonate flame retardants (e.g., potassium benzenesulfonylbenzenesulfonate (KSS), sodium 2,4,5-trichlorobenzenesulfonate (STB), sodium toluenesulfonate (NATS)), organosilicon flame retardants (e.g., polysiloxane and its derivatives flame retardants, crosslinked polydimethylsiloxane (PDMS) and its derivatives, polysilane and its derivatives, polysilsesquioxane and its derivatives), and phosphazene flame retardants (e.g., hexaphenoxycyclotriphosphazene, hexachlorocyclotriphosphazene).

[0033] The selected antioxidants are one or more of the following: hindered phenolic antioxidants (e.g., (β-3,5-di-tert-butyl-4-hydroxyphenyl) acrylate), phosphite antioxidants (e.g., tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol diphosphite), and thiolated antioxidants (e.g., lauryl thiodipropionate (DLTDP), octadecyl thiodipropionate (DSTDP)).

[0034] Example 1

[0035] A halogen-free and fluorine-free environmentally friendly flame-retardant PC composite material with light diffusion effect comprises the following components in parts by weight: 99 parts PC, 0.1 parts light diffusing agent - polytetrafluoroethylene, 0.3 parts sulfonate flame retardant, 0.3 parts organosilicon flame retardant, and 0.3 parts antioxidant.

[0036] The selected PC is recycled PCR-PC with a molecular weight of 19.6 g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 49,000 to 50,000, and a molecular weight distribution of 1.8 to 2.0. Its base material is bisphenol A type linear polycarbonate, which is synthesized using the phosgene method. Specifically, it is the crushed material of MITEK 30050 automotive headlight housing recovered by physical method.

[0037] The selected light diffusing agent, polytetrafluoroethylene (PTFE), is an ultra-high molecular weight PTFE (Mw ~ 4.5 million). It is odorless, a white powder with an average particle size of approximately 420 μm and an apparent density of 0.85 g / cm³. 3 It has a melting point of 320-330℃ and possesses strong chemical stability, thermal stability, resistance to chemical reagents, and insulation properties. It also has excellent ductility. Specifically, it is Daikin's anti-dripping agent FA500H from Japan, a pure powder with 100% PTFE content.

[0038] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant. It has the characteristics of low addition amount, halogen-free and fluorine-free, and can achieve flame retardant and fireproof requirements for ultra-thin thickness (≤1.6mm). In addition, when combined with light diffusing agent - polytetrafluoroethylene, it can achieve anti-dripping effect. The sulfonate flame retardant (powder) is potassium benzenesulfonylbenzenesulfonate (KSS), and the organosilicon flame retardant (powder) is Shin-Etsu Chemical KR-480 from Japan.

[0039] The selected antioxidant is a combination of hindered phenols and phosphites, specifically pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], i.e. 1010. It has a significant synergistic effect and features low addition amount and significant antioxidant and anti-yellowing effects.

[0040] The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

[0041] When preparing this halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, the corresponding weight parts of the components are weighed according to the above proportions. After the mixture of each component material is mixed and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the finished product.

[0042] Example 2

[0043] A halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect comprises the following components in parts by weight: 98.9 parts PC, 0.2 parts light diffusing agent - polytetrafluoroethylene, 0.3 parts sulfonate flame retardant, 0.3 parts organosilicon flame retardant, and 0.3 parts antioxidant.

[0044] The selected PC is recycled PCR-PC with a molecular weight of 19.6 g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 49,000 to 50,000, and a molecular weight distribution of 1.8 to 2.0. Its base material is bisphenol A type linear polycarbonate, which is synthesized using the phosgene method. Specifically, it is the crushed material of MITEK 30050 automotive headlight housing recovered by physical method.

[0045] The selected light diffusing agent, polytetrafluoroethylene (PTFE), is an ultra-high molecular weight PTFE (Mw ~ 4.5 million). It is odorless, a white powder with an average particle size of approximately 420 μm and an apparent density of 0.85 g / cm³. 3 It has a melting point of 320-330℃ and possesses strong chemical stability, thermal stability, resistance to chemical reagents, and insulation properties. It also has excellent ductility. Specifically, it is Daikin's anti-dripping agent FA500H from Japan, a pure powder with 100% PTFE content.

[0046] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant. It has the characteristics of low addition amount, halogen-free and fluorine-free, and can achieve flame retardant and fireproof requirements for ultra-thin thickness (≤1.6mm). In addition, when combined with light diffusing agent - polytetrafluoroethylene, it can achieve anti-dripping effect. The sulfonate flame retardant (powder) is potassium benzenesulfonylbenzenesulfonate (KSS), and the organosilicon flame retardant (powder) is Shin-Etsu Chemical KR-480 from Japan.

[0047] The selected antioxidant is a combination of hindered phenols and phosphites, specifically pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], i.e. 1010. It has a significant synergistic effect and features low addition amount and significant antioxidant and anti-yellowing effects.

[0048] The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

[0049] When preparing this halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, the corresponding weight parts of the components are weighed according to the above proportions. After the mixture of each component material is mixed and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the finished product.

[0050] Example 3

[0051] A halogen-free and fluorine-free environmentally friendly flame-retardant PC composite material with light diffusion effect comprises the following components in parts by weight: 98.8 parts PC, 0.3 parts light diffusing agent - polytetrafluoroethylene, 0.3 parts sulfonate flame retardant, 0.3 parts organosilicon flame retardant, and 0.3 parts antioxidant.

[0052] The selected PC is recycled PCR-PC with a molecular weight of 19.6 g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 49,000 to 50,000, and a molecular weight distribution of 1.8 to 2.0. Its base material is bisphenol A type linear polycarbonate, which is synthesized using the phosgene method. Specifically, it is the crushed material of MITEK 30050 automotive headlight housing recovered by physical method.

[0053] The selected light diffusing agent, polytetrafluoroethylene (PTFE), is an ultra-high molecular weight PTFE (Mw ~ 4.5 million). It is odorless, a white powder with an average particle size of approximately 420 μm and an apparent density of 0.85 g / cm³. 3 It has a melting point of 320-330℃ and possesses strong chemical stability, thermal stability, resistance to chemical reagents, and insulation properties. It also has excellent ductility. Specifically, it is Daikin's anti-dripping agent FA500H from Japan, a pure powder with 100% PTFE content.

[0054] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant. It has the characteristics of low addition amount, halogen-free and fluorine-free, and can achieve flame retardant and fireproof requirements for ultra-thin thickness (≤1.6mm). In addition, when combined with light diffusing agent - polytetrafluoroethylene, it can achieve anti-dripping effect. The sulfonate flame retardant (powder) is potassium benzenesulfonylbenzenesulfonate (KSS), and the organosilicon flame retardant (powder) is Shin-Etsu Chemical KR-480 from Japan.

[0055] The selected antioxidant is a combination of hindered phenols and phosphites, specifically pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], i.e. 1010. It has a significant synergistic effect and features low addition amount and significant antioxidant and anti-yellowing effects.

[0056] The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

[0057] When preparing this halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, the corresponding weight parts of the components are weighed according to the above proportions. After the mixture of each component material is mixed and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the finished product.

[0058] Comparative Example 1

[0059] A halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material comprises the following components in parts by weight: 99.7 parts PC and 0.3 parts antioxidant.

[0060] The selected PC is recycled PCR-PC with a molecular weight of 19.6 g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 49,000 to 50,000, and a molecular weight distribution of 1.8 to 2.0. Its base material is bisphenol A type linear polycarbonate, which is synthesized using the phosgene method. Specifically, it is the crushed material of MITEK 30050 automotive headlight housing recovered by physical method.

[0061] The selected antioxidant is a combination of hindered phenols and phosphites, specifically pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], i.e. 1010. It has a significant synergistic effect and features low addition amount and significant antioxidant and anti-yellowing effects.

[0062] The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

[0063] When preparing this halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, the corresponding weight parts of the components are weighed according to the above proportions. After the mixture of each component material is mixed and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the finished product.

[0064] Comparative Example 2

[0065] A halogen-free and fluorine-free environmentally friendly flame-retardant PC composite material comprises the following components in parts by weight: 99.1 parts PC, 0.3 parts sulfonate flame retardant, 0.3 parts organosilicon flame retardant, and 0.3 parts antioxidant.

[0066] The selected PC is recycled PCR-PC with a molecular weight of 19.6 g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 49,000 to 50,000, and a molecular weight distribution of 1.8 to 2.0. Its base material is bisphenol A type linear polycarbonate, which is synthesized using the phosgene method. Specifically, it is the crushed material of MITEK 30050 automotive headlight housing recovered by physical method.

[0067] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant. It has the characteristics of low addition amount, halogen-free and fluorine-free, and can achieve flame retardant and fire protection requirements for ultra-thin thickness (≤1.6mm). The sulfonate flame retardant (powder) is potassium benzenesulfonylbenzenesulfonate (KSS), and the organosilicon flame retardant (powder) is Shin-Etsu Chemical KR-480 from Japan.

[0068] The selected antioxidant is a combination of hindered phenols and phosphites, specifically pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], i.e. 1010. It has a significant synergistic effect and features low addition amount and significant antioxidant and anti-yellowing effects.

[0069] The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

[0070] When preparing this halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, the corresponding weight parts of the components are weighed according to the above proportions. After the mixture of each component material is mixed and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the finished product.

[0071] Comparative Example 3

[0072] A halogen-free and fluorine-free environmentally friendly flame-retardant PC composite material comprises the following components in parts by weight: 98.9 parts PC, 0.2 parts light diffusing agent-1, 0.3 parts sulfonate flame retardant, 0.3 parts organosilicon flame retardant, and 0.3 parts antioxidant.

[0073] The selected PC is recycled PCR-PC with a molecular weight of 19.6 g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 49,000 to 50,000, and a molecular weight distribution of 1.8 to 2.0. Its base material is bisphenol A type linear polycarbonate, which is synthesized using the phosgene method. Specifically, it is the crushed material of MITEK 30050 automotive headlight housing recovered by physical method.

[0074] The selected light diffusing agent-1 is an acrylate-based polydisperse PMMA micropowder with an average particle size of about 3 μm and a refractive index of 1.49. It has the characteristics of low addition amount, significant improvement of light diffusion effect, and no effect on the mechanical and mechanical properties of composite materials. Specifically, it is the high light transmittance diffusing agent PMMA microspheres KMR-3EA from Japan's Soken Chemical.

[0075] The selected flame retardant is a combination of sulfonate flame retardant and organosilicon flame retardant. It has the characteristics of low addition amount, halogen-free and fluorine-free, and can achieve flame retardant and fire protection requirements for ultra-thin thickness (≤1.6mm). The sulfonate flame retardant (powder) is potassium benzenesulfonylbenzenesulfonate (KSS), and the organosilicon flame retardant (powder) is Shin-Etsu Chemical KR-480 from Japan.

[0076] The selected antioxidant is a combination of hindered phenols and phosphites, specifically pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], i.e. 1010. It has a significant synergistic effect and features low addition amount and significant antioxidant and anti-yellowing effects.

[0077] The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

[0078] When preparing this halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect, the corresponding weight parts of the components are weighed according to the above proportions. After the mixture of each component material is mixed and conveyed by the screw, it is fully melted and compounded. Then, it is extruded through the die head, drawn into strips, cooled, and pelletized to finally obtain the finished product.

[0079] After implementation, the above embodiments and comparative examples were reproduced with the same components. Examples 1, 2, and 3, and Comparative Examples 1, 2, and 3 were melt-extruded and granulated. Then, the particles from each embodiment and comparative example were injection molded into standard test strips on an injection molding machine. The properties of the materials obtained were tested according to standards, and the test results are shown in Table 1.

[0080] Table 1 Test Results

[0081]

[0082] The test results of Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3 show that the present invention utilizes PC and processing aids to prepare a halogen-free, fluorine-free, environmentally friendly, flame-retardant PC composite material with light diffusion effect.

[0083] The beneficial effects of this invention are:

[0084] 1. The PC used in this invention is recycled PCR-PC (≥98%), which is recycled from daily production and life, such as drinking water bottles, CDs, car headlight housings, etc. The treatment methods are all physical, which reduces carbon dioxide emissions and energy consumption.

[0085] 2. The light diffusing agent polytetrafluoroethylene used in this invention has the advantages of low addition amount, significant improvement of light diffusion effect, and beautiful effect similar to starry sky, while not affecting the mechanical, mechanical and flame retardant properties of PC composite material, achieving a light transmittance of 80-90% and haze >80% for composite material (thickness 2.0mm).

[0086] 3. The flame retardant and light diffusing agent polytetrafluoroethylene used in this invention are both halogen-free and fluorine-free materials, which are environmentally friendly and comply with national and international regulations, represented by the European Union. They will not cause secondary pollution to the environment and there is no need to worry about the impact on human health.

[0087] 4. The method for improving the light diffusion effect of PC composite materials in this invention is simple and easy to implement. The desired finished particle material can be obtained by processing a mixture of PC and several processing aids through a single screw extruder, and the production cost is low.

[0088] It should be noted that the present invention is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made by those skilled in the art to the above embodiments based on the technical solutions of the present invention shall fall within the protection scope of the present invention.

Claims

1. A halogen-free and fluorine-free environmentally friendly flame-retardant PC composite material with light diffusion effect, characterized in that, The components include the following parts by weight: PC, 90–99.78 parts by weight; Light diffusing agent, 0.2–5 parts by weight; Flame retardant, 0.01 to 3 parts by weight; Antioxidant, 0.01 to 2 parts by weight; The light diffusing agent is polytetrafluoroethylene.

2. The halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect as described in claim 1, characterized in that: The PC is one or more of the following: bisphenol A type polycarbonate, polyester type polycarbonate, organosilicon copolymer PC, cyclohexane bisphenol A type polycarbonate, and high-temperature resistant polycarbonate synthesized from bisphenol TMC.

3. The halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect as described in claim 2, characterized in that: The PCR-PC has a melt flow rate MI = (10-50) g / 10 min (300℃ / 1.2 kg), a weight-average molecular weight of 20,000-50,000, and a molecular weight distribution of 1-2.

4. The halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect as described in claim 1, characterized in that: The flame retardant is one or more of the following: hypophosphite flame retardants, phosphate ester flame retardants, sulfonate flame retardants, organosilicon flame retardants, and phosphazene flame retardants, in combination and use.

5. The halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect as described in claim 1, characterized in that: The antioxidant is a combination and use of one or more hindered phenolic, phosphite, and thiolated antioxidants.

6. The halogen-free, fluorine-free, environmentally friendly flame-retardant PC composite material with light diffusion effect as described in claim 1, characterized in that: The selected processing machine is a single-screw extruder with a processing temperature of 250-270℃ and a screw speed of 100-200rpm.

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