High-transmittance high-haze light diffusion resin / PET alloy material, preparation method and LED floor tile screen mask

Abstract

The invention discloses a high-transmittance high-haze light diffusion resin / PET alloy material, a preparation method and an LED floor tile screen mask. The alloy material comprises the following components in percentage by mass: 80-97% of a resin base material, not more than 15% of PET, not more than 0.6% of a light diffusion agent, not more than 0.6% of a dispersing agent, 0.5-2.0% of a flame retardant and the balance of other auxiliaries. According to the resin / PET alloy material, the problems that in the prior art, when light diffusion PC is used for an LED floor tile screen mask, the light transmittance is low, the haze is low, lamp beads and bright screen moire patterns are likely to be seen when an LED screen is turned off, and the chemical resistance is poor are solved.

Description

Technical Field

[0001] The present application relates to a high-transmittance, high-fog, and light-diffusing resin / PET alloy material and a preparation method thereof, as well as an LED floor tile screen mask. Background Art

[0002] PC (polycarbonate) boasts high strength, toughness, and light transmittance, making it one of the most widely used and best-performing thermoplastic materials for light diffusion. However, it also suffers from several drawbacks, including poor chemical, oil, and acid / base resistance, and susceptibility to stress cracking. Currently, there are numerous approaches to modifying PC alloys, such as adding light diffusion materials. However, these efforts do not improve flame retardancy, and the materials suffer from low light transmittance and haze, poor processability, and resistance to stress cracking.

[0003] LED floor tiles are commonly used in venues such as stage performances, commercial exhibitions, shopping malls, nightclubs, and museums to create immersive and interactive visual experiences. Floor tile screen masks, which sit above the LED lamps, protect, beautify, and enhance the display. However, existing LED floor tiles suffer from low light transmittance, low haze, visible LED lamps when the LEDs are off, and moiré patterns when the screen is on. Summary of the Invention

[0004] In view of this, the technical problem to be solved by this application is to provide a high-transmittance and high-haze light-diffusing resin / PET alloy material and preparation method, as well as an LED floor tile screen mask, so as to improve the problems of low transmittance, low haze, easy visibility of lamp beads when the LED screen is off, moiré patterns on the screen when it is on, and poor chemical resistance when the light-diffusing PC is used for the LED floor tile screen mask in the existing technology.

[0005] To solve the above problems, according to one aspect of the present application, a resin / PET alloy material with high transmittance and high haze light diffusion is proposed, comprising the following components calculated by mass percentage:

[0006] Resin base material: 80-97%;

[0007] PET: not more than 15%;

[0008] Light diffuser: not more than 0.6%;

[0009] Dispersant: not more than 0.6%;

[0010] Flame retardant: 0.5-2.0%;

[0011] Other additives: remaining mass percentage.

[0012] According to another aspect of the present application, a method for preparing a resin / PET alloy material with high transmittance and high haze light diffusion is proposed, comprising the steps of:

[0013] Weigh the components of the alloy material of any embodiment according to mass, put them into a high-speed mixer to form a uniform blend;

[0014] The blend is fed into an extruder for extrusion granulation, wherein the operating parameters of the extruder are: extrusion temperature 230-260° C., screw speed 350-400 rpm, main engine feeding 15-25 rpm, and vacuum degree -0.02-0.04 MPa.

[0015] According to another aspect of the present application, an LED floor tile screen mask is provided, comprising:

[0016] The LED floor tile screen mask is obtained by injection molding the alloy material of any embodiment.

[0017] The alloy material of at least one embodiment of the present application has at least the following technical advantages:

[0018] 1. Utilize the advantages of PET (polyethylene terephthalate) material with higher light transmittance, chemical resistance and good fluidity to improve the poor chemical resistance and stress cracking of light diffusion PC, thus achieving complementary performance between the two.

[0019] 2. By compounding the light diffuser with PET resin, the synergistic effect can be achieved to further improve the light transmittance and haze of the material;

[0020] 3. The introduction of hyperbranched polymers has excellent dispersing effect, increases the dispersing effect of light diffusers, improves the optical properties of the material, and at the same time significantly increases the melt index, improves the fluidity of the material, and makes it easier to form and process. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Shown is a schematic diagram of the hyperbranched structure of the dispersant used in one embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following examples further illustrate this application in detail. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0023] Polycarbonate (PC), with its advantages of high strength, toughness, and light transmittance, is one of the most widely used and best-performing thermoplastic materials for light diffusion. However, it has some drawbacks, such as poor chemical resistance, oil resistance, acid and alkali resistance, and susceptibility to stress cracking. Polyethylene terephthalate (PET), a crystalline material, offers advantages such as excellent solvent resistance, processing fluidity, and higher light transmittance, but suffers from poor heat resistance and low impact strength.

[0024] This application proposes a high-transmittance and high-haze light-diffusing resin / PET alloy material, comprising the following components calculated by mass percentage:

[0025] Resin base material: 80-97%

[0026] PET: no more than 15%

[0027] Light diffuser: not more than 0.6%;

[0028] Dispersant: not more than 0.6%;

[0029] Flame retardant: 0.5-2.0%;

[0030] Other additives: remaining mass percentage.

[0031] In at least one embodiment, the resin / PET alloy material further comprises the following components calculated by mass percentage:

[0032] Ester exchange inhibitor: 0.3-0.6%;

[0033] Nucleating agent: 0.5-2%;

[0034] Weathering agent: 0.2-0.6%;

[0035] Antioxidant: 0.2-0.5%.

[0036] In at least one embodiment, the resin base material of the resin / PET alloy material is a polycarbonate PC material, and the number average molecular weight of the polycarbonate PC material is 15,000 to 40,000; the light transmittance is >90%; and the refractive index is 1.49 to 1.5.

[0037] In at least one embodiment, the number average molecular weight of PET in the resin / PET alloy material is 18,000 to 40,000, and the intrinsic viscosity is 0.6 to 0.8 dl / g.

[0038] In at least one embodiment, the light diffuser of the resin / PET alloy material is a mixture of one or two selected from polyisobutyl methacrylate PIBMA, polystyrene PS, polysiloxane, and polyacrylic acid particles in any proportion; the refractive index of the light diffuser is 1.41 to 1.54, and the particle size of the light diffuser is 0.5 to 5 μm.

[0039] In at least one embodiment, the dispersant for the resin / PET alloy material is a hyperbranched polymer. In at least one embodiment, the hyperbranched polymer has an asymmetric, three-dimensional branched structure formed by polycondensation of multiple branching units. In at least one embodiment, the ends of the hyperbranched polymer contain reactive functional groups, wherein the functional groups are any two or more of carboxyl groups, hydroxyl groups, ester groups, and sulfonic acid groups.

[0040] According to another aspect of the present application, a method for preparing a high-transmittance and high-haze light-diffusing resin / PET alloy material is proposed, comprising the steps of:

[0041] The alloy material of any embodiment is weighed according to the mass of each component of the formula, and put into a high-speed mixer to form a uniform blend;

[0042] The blend is fed into an extruder for extrusion granulation, wherein the operating parameters of the extruder are: extrusion temperature 230-260° C., screw speed 350-400 rpm, main engine feeding 15-25 rpm, and vacuum degree -0.02-0.04 MPa.

[0043] In another aspect of the present application, an LED floor tile screen mask is provided, comprising:

[0044] The LED floor tile screen mask is obtained by injection molding the alloy material of any embodiment.

[0045] In at least one embodiment, the process of injection molding an LED floor tile screen mask comprises: baking the alloy material of any embodiment, placing it into an injection molding mold for the LED floor tile screen mask, and performing injection molding; wherein the baking parameters are: baking the material at 100-120°C for 3-5 hours. wherein the operating parameters of the injection molding process are: injection temperature of 250-270°C; injection pressure of 80-120 MPa; injection speed of 40-80 mm / s; holding pressure of 30-60 MPa; back pressure of 0.5-1 MPa; mold temperature of 100-120°C; and demolding the LED floor tile screen mask to obtain the LED floor tile screen mask.

[0046] Example 1

[0047] This embodiment provides a method for preparing a high-transmittance and high-haze light-diffusing resin / PET alloy material, comprising the following steps:

[0048] S11. Mixing: 85.80% of the resin base material, 10% of the PET, 0.40% of the light diffuser, 1.00% of the flame retardant, 0.40% of the transesterification inhibitor, 1.20% of the nucleating agent, 0.50% of the dispersant, 0.30% of the weathering agent, and 0.40% of the antioxidant are placed in a high-speed mixer and mixed; wherein the mixing process is as follows: stirring speed of 400-800 r / min, stirring at a constant speed for 2-3 minutes to form a uniform blend;

[0049] S12, extrusion: the blend is fed into the extruder through the hopper for extrusion granulation, the extrusion temperature is 230-260°C, the screw speed is 350-400 rpm, the main feed is 15-25 rpm, and the vacuum degree is -0.02-0.04 MPa;

[0050] S13. The prepared resin / PET alloy material is further used to prepare standard specimens for performance testing.

[0051] Example 2

[0052] This embodiment provides a method for preparing a high-transmittance and high-haze light-diffusing resin / PET alloy material, comprising the following steps:

[0053] S21. Mixing: 80.80% of the resin base material, 15% of the PET, 0.40% of the light diffuser, 1.00% of the flame retardant, 0.40% of the transesterification inhibitor, 1.20% of the nucleating agent, 0.50% of the dispersant, 0.30% of the weathering agent, and 0.40% of the antioxidant are placed in a high-speed mixer and mixed; wherein the mixing process is as follows: stirring speed of 400-800 r / min, stirring at a constant speed for 2-3 minutes to form a uniform blend;

[0054] S22, the blend is fed into an extruder through a hopper for extrusion granulation, with an extrusion temperature of 230-260°C, a screw speed of 350-400 rpm, a main feed speed of 15-25 rpm, and a vacuum degree of -0.02-0.04 MPa;

[0055] S23. The prepared resin / PET alloy material is further used to prepare standard specimens for performance testing.

[0056] Example 3

[0057] The present invention provides a method for preparing a high-transmittance and high-haze light-diffusing resin / PET alloy material, comprising the following steps:

[0058] S31. Mixing: 86.00% of the resin base material, 10% of the PET, 0.20% of the light diffuser, 1.00% of the flame retardant, 0.40% of the transesterification inhibitor, 1.20% of the nucleating agent, 0.50% of the dispersant, 0.30% of the weathering agent, and 0.40% of the antioxidant are placed in a high-speed mixer and mixed; wherein the mixing process is as follows: stirring speed of 400-800 r / min, stirring at a constant speed for 2-3 minutes to form a uniform blend;

[0059] S32. The blend is fed into an extruder through a hopper for extrusion granulation. The extrusion temperature is 230-260° C., the screw speed is 350-400 rpm, the main feed speed is 15-25 rpm, and the vacuum degree is -0.02-0.04 MPa.

[0060] S33. The prepared resin / PET alloy material is further used to prepare standard specimens for performance testing.

[0061] Example 4

[0062] The present invention provides a method for preparing a high-transmittance and high-haze light-diffusing resin / PET alloy material, comprising the following steps:

[0063] S41. Mixing: 86.10% of resin base material, 10% of PET, 0.40% of light diffuser, 1.00% of flame retardant, 0.40% of ester exchange inhibitor, 1.20% of nucleating agent, 0.20% of dispersant, 0.30% of weathering agent, and 0.40% of antioxidant are put into a high-speed mixer for mixing; wherein, the mixing process is: stirring speed 400-800 r / min, stirring at a constant speed for 2-3 minutes to form a uniform blend.

[0064] S42. The blend is fed into an extruder through a hopper for extrusion granulation. The extrusion temperature is 230-260° C., the screw speed is 350-400 rpm, the main feed speed is 15-25 rpm, and the vacuum degree is -0.02-0.04 MPa.

[0065] S43. The prepared resin / PET alloy material is further used to prepare standard specimens for performance testing.

[0066] Material description of the above Examples 1-4:

[0067] Resin substrate: polycarbonate (PC) material, number average molecular weight: 15000-40000; light transmittance: >90%; refractive index: 1.49-1.5.

[0068] PET: Ethylene terephthalate (PET), number average molecular weight: 18,000-40,000; intrinsic viscosity: 0.6-0.8 dl / g; melt index (265°C / 2.16kg): 80-120 g / 10min.

[0069] Light diffuser: a mixture of one or two of polyisobutyl methacrylate (PIBMA), polystyrene (PS), polysiloxane, and polyacrylic acid (PAA) particles in any proportion; the refractive index of the material is 1.41 to 1.54, and the particle size is 0.5 to 5 μm.

[0070] Flame retardant: One or more of the following: bromine-based, phosphonate-based, sulfonate-based, and silicone-based. A combination of two or more of these, preferably in any ratio, is preferred. An anti-drip agent may also be added for flame retardant synergy. The mass ratio of anti-drip agent to flame retardant is 1:2.

[0071] The ester exchange inhibitor is a phosphate compound, preferably including any one of sodium dihydrogen phosphate, sodium pyrophosphate, sodium metaphosphate, triethyl phosphite, triphenyl phosphite, and diisooctyl phosphate, or a combination of two or more thereof.

[0072] Nucleating agent: An organic nucleating agent or an inorganic nucleating agent. Organic nucleating agents preferably include sodium benzoate, sodium montanate, and ethylene-acrylic acid sodium ionomer. Inorganic nucleating agents preferably include barium sulfate, montmorillonite, talc, and kaolin. It is further preferred that the organic nucleating agent and the inorganic nucleating agent be mixed in a mass ratio of 1:2 to 2:1.

[0073] Dispersant: It is a hyperbranched polymer with an asymmetric, three-dimensional branched structure, formed by polycondensation of multiple branched units (such as ABx type monomers), such as Figure 1 As shown. Hyperbranched polymers have many branching points, the molecular chains are not easy to entangle, and the viscosity does not change with the increase of molecular weight; in addition, the ends contain a large number of active functional groups and have characteristics such as branched structure. When adsorbed on the surface of particles (such as pigments, fillers), the branched structure forms a three-dimensional barrier to prevent physical contact between particles and reduce agglomeration. The terminal groups are bound to the particle surface through chemical bonds or hydrogen bonds, thereby enhancing the anchoring effect and improving the dispersion stability, thereby having dispersion lubrication and improving the fluidity of the formula. It is further preferred that the terminal functional groups A and B are any two or more of carboxyl groups, hydroxyl groups, ester groups, sulfonic acid groups, etc.

[0074] Weathering agent: It is an ultraviolet absorber, preferably including benzotriazoles, triazines, etc., and more preferably benzotriazoles.

[0075] Antioxidant: A mixture of a primary antioxidant and a secondary antioxidant, preferably a mixture of a hindered phenol primary antioxidant and a phosphite secondary antioxidant, more preferably a mixture of hindered phenol and phosphite in a mass ratio of 1:2 to 2:1.

[0076] Comparative case table 1:

[0077] Material composition Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Example 4 Resin base material 97.40％ 86.20％ 86.30％ 85.80％ 80.80％ 86.00％ 86.10％ PET - 10％ 10％ 10％ 15％ 10％ 10％ Light diffuser 0.40％ - 0.40％ 0.40％ 0.40％ 0.20％ 0.40％ flame retardants 1.00％ 1.00％ 1.00％ 1.00％ 1.00％ 1.00％ 1.00％ Transesterification inhibitors - 0.40％ 0.40％ 0.40％ 0.40％ 0.40％ 0.40％ Nucleating agent - 1.20％ 1.20％ 1.20％ 1.20％ 1.20％ 1.20％ dispersants 0.50％ 0.50％ - 0.50％ 0.50％ 0.50％ 0.20％ Weathering agent 0.30％ 0.30％ 0.30％ 0.30％ 0.30％ 0.30％ 0.30％ antioxidants 0.40％ 0.40％ 0.40％ 0.40％ 0.40％ 0.40％ 0.40％ total 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％ 100.00％

[0078] Material performance data:

[0079] Melt index: Refer to GB / T 3682-2000 "Thermoplastic melt mass flow rate and melt volume flow rate determination" standard test;

[0080] Tensile properties: Refer to GB / T 1040.1 / -2006 "Standard test for the determination of tensile properties of plastics" standard test;

[0081] Bending performance: Refer to GB / T 9341-2008 "Test for bending properties of plastics" standard test;

[0082] Impact performance: Refer to GB / T 1843-2008 "Determination of Izod Impact Strength of Plastics" standard test;

[0083] Flame retardancy: Refer to UL-94 "Tests for flammability of plastic materials for equipment and electrical components" standard test;

[0084] Light transmittance and haze: Refer to GB / T 2410-2008 "Determination of light transmittance and haze of transparent plastics" standard test.

[0085] The alloy materials of Examples 1-4 and the materials of Comparative Examples 1-3 were subjected to parameter tests according to the above standards, and the obtained material properties are shown in Table 2:

[0086] Table 2 Material properties

[0087] Performance Project Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Example 4 Melt index / g / 10min 16.7 18.3 11.8 17.9 19.4 17.7 14.7 Tensile strength / MPa 68 64 61 67 62.7 63 64 Bending strength / MPa 95 93 89 92.1 91.3 91 88 Flexural modulus / MPa 2327 2221 2087 2285 2052 2107 1982 <![CDATA[Impact strength / KJ / m 2 > 68 55 58 60 54 55 57 Flame retardant grade (1.6mm) V0 V0 V0 V0 V0 V0 V0 Light transmittance (%) 87 88 83 89 85 86 79 Haze (%) 88 58 84 96 96 77 91

[0088] Example 5

[0089] This embodiment provides an LED floor tile screen mask, which is made by injection molding the alloy materials of the above comparative examples 1-3 and embodiments 1-4. The injection molding process includes:

[0090] S51, baking: baking at 100-120°C for 3-5 hours;

[0091] S52, injection molding: adding the baked material into the injection molding machine to form the LED floor tile screen mask;

[0092] Among them, the injection temperature is 250-270°C; the injection pressure is 80-120 MPa; the injection speed is 40-80 mm / s; the holding pressure is 30-60 MPa; the back pressure is 0.5-1 MPa; and the mold temperature is 100-120°C.

[0093] In this embodiment, after being placed at 25° C. and 50% humidity for 24 hours, the haze and light transmittance of the obtained product were tested. The results are shown in Table 3 below.

[0094] Table 3 Transmittance and haze

[0095] Performance Project Standard requirements Comparative Example 1 Comparative Example 2 Comparative Example 3 Example 1 Example 2 Example 3 Example 4 Light transmittance (%) ≥50 52.1 53.1 47.9 53.4 50.4 51.4 46.8 Haze (%) ≥90 95.2 64.3 91.3 98.8 97.5 83.4 93.2

[0096] Tables 2 and 3 show that the present invention alloys PC and PET for flame retardancy and light diffusion. By compounding the light diffuser, the material's haze is increased while maintaining high light transmittance. The introduction of a hyperbranched compound not only improves the light diffuser's dispersion and enhances the material's optical properties, but also increases the material's melt index and processing performance.

[0097] The above description of the preferred embodiments of the present invention with reference to the accompanying drawings does not limit the scope of the present invention. Those skilled in the art may implement the present invention in various variations without departing from the scope and spirit of the present invention. For example, features of one embodiment may be applied to another embodiment to obtain yet another embodiment. Any modifications, equivalent substitutions, and improvements made within the technical concept of the present invention shall be within the scope of the present invention.

Claims

1. A high-transmittance, high-haze, light-diffusing resin / PET alloy material, comprising the following components calculated by mass percentage: Resin base material: 80-97%; PET: not more than 15%; Light diffuser: not more than 0.6%; Dispersant: not more than 0.6%; Flame retardant: 0.5-2.0%; Other additives: remaining mass percentage.

2. The alloy material according to claim 1, characterized in that: The other additives include the following components calculated by mass percentage: Ester exchange inhibitor: 0.3-0.6%; Nucleating agent: 0.5-2%; Weathering agent: 0.2-0.6%; Antioxidant: 0.2-0.5%.

3. The alloy material according to claim 1, characterized in that: The resin substrate is a polycarbonate PC material, and the number average molecular weight of the polycarbonate PC material is 15000 to 40000; the light transmittance is >90%; Refractive index: 1.49~1.

5.

4. The alloy material according to claim 1, characterized in that: The number average molecular weight of the PET is 18,000 to 40,000, and the intrinsic viscosity is 0.6 to 0.8 dl / g.

5. The alloy material according to claim 1, characterized in that: The light diffuser is selected from polyisobutyl methacrylate PIBMA, polystyrene PS, polysiloxane, polyacrylic acid particles or a mixture of two of them in any proportion; the refractive index of the light diffuser is 1.41-1.54, and the particle size of the light diffuser is 0.5-5 μm.

6. The alloy material according to claim 1, characterized in that: The dispersant is a hyperbranched polymer.

7. The alloy material according to claim 6, characterized in that: The hyperbranched polymer has an asymmetric, three-dimensional branched structure and is formed by polycondensation of multiple branching units.

8. The alloy material according to claim 6, characterized in that: The ends of the hyperbranched polymer contain active functional groups, which are any two or more of carboxyl groups, hydroxyl groups, ester groups, and sulfonic acid groups.

9. A method for preparing a resin / PET alloy material with high transmittance and high haze light diffusion, comprising the steps of: Weigh the alloy material according to any one of claims 1 to 8 according to the mass of each component of the formula, put it into a high-speed mixer and stir it to form a uniform blend; The blend is fed into an extruder for extrusion granulation, wherein: The working parameters of the extruder are: extrusion temperature 230~260℃, screw speed 350~400rpm, main machine feeding 15~25rpm, vacuum degree -0.02~0.04MPa.

10. An LED floor tile screen mask, characterized by: The LED floor tile screen mask is obtained by injection molding of any one of the alloy materials according to claims 1-8.

11. The LED floor tile screen mask according to claim 10, characterized in that: The injection-molded alloy material is baked and then put into an injection molding mold of an LED floor tile screen mask for injection molding; wherein the baking parameters are: baking at 100-120° C. for 3-5 hours; the working parameters of the injection molding process are: injection temperature 250-270° C., injection pressure 80-120 MPa, injection speed 40-80 mm / s, holding pressure 30-60 MPa, back pressure 0.5-1 MPa, and mold temperature 100-120° C.

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