CN101205358B - A kind of high reflective polycarbonate composition and its application - Google Patents

Abstract

The invention provides a polycarbonate composition with high light reflection, comprising 63-90 parts of polycarbonate (PC), 3-6 parts of brominated polycarbonate, 2-5 parts of acrylic core-shell copolymer (IM) parts, TiO ₂ 5-25 parts, antioxidant 0.1-0.3 parts, lubricant 0.2-0.4 parts, PTFE micropowder 0.3-0.5 parts; the composition has flame retardancy, high light reflectivity, high temperature resistance, easy molding, light blocking Good performance and other characteristics, used in the production of electronic and electrical components such as LED displays and LCD displays.

Description

A kind of high reflective polycarbonate composition and its application

technical field

The invention relates to a polycarbonate composition with high light reflectivity and application thereof, belonging to the field of polymer alloys.

Background technique

Polycarbonate, especially bisphenol A polycarbonate has outstanding impact toughness, excellent electrical insulation, wide temperature range, stable product size, and is a kind of engineering plastic with good comprehensive performance. Although polycarbonate has good overall performance, some of its defects such as easy stress cracking, sensitivity to notch, poor wear resistance and poor processing fluidity need to be improved.

Although there are many different reinforced and flame-retardant polycarbonate materials, they still cannot meet the special needs in the field of optoelectronics. For example, some parts of LED displays and LCE displays require materials with flame High temperature, high ink adhesion, good dimensional stability, and easy processing and molding, etc., but the existing materials are not suitable, and the performance of the material needs to be further improved to meet the product requirements.

Contents of the invention

The object of the present invention is to provide a polycarbonate composition with high light reflectivity, which has the characteristics of flame retardancy, high light reflectivity, high temperature resistance, easy molding, good light resistance, etc., and is used for LED displays, LCD displays, etc. Production of electrical and electronic components.

Another object of the present invention is to provide a use of a polycarbonate composition with high light reflectivity.

In order to achieve the purpose of the present invention, a high light reflective polycarbonate composition according to the present invention comprises 63 to 90 parts of polycarbonate (PC), 3 to 6 parts of brominated polycarbonate, and acrylic core-shell copolymerization (IM) 2-5 parts, TiO ₂ 5-25 parts, antioxidant 0.1-0.3 parts, lubricant 0.2-0.4 parts, PTFE micropowder 0.3-0.5 parts.

Preferably, 70-90 parts of polycarbonate, 4-6 parts of brominated polycarbonate, 3-5 parts of acrylic core-shell copolymer (IM), 10-25 parts of TiO ₂ , 0.1-25 parts of antioxidant 0.3 parts, lubricant 0.2-0.4 parts, PTFE micropowder 0.3-0.5 parts.

More preferably, 80-90 parts of polycarbonate, 4-6 parts of brominated polycarbonate, 3-5 parts of acrylic core-shell copolymer (IM), 15-25 parts of TiO ₂ , 0.1-0.3 parts of antioxidant 0.2-0.4 parts lubricant, 0.3-0.5 parts PTFE micropowder.

The parts are parts by weight, which can be weight units commonly used in the field such as kilograms, grams, tons, and kilograms.

Among them, the melt index of polycarbonate is 10 ~ 15g/10min (1.2kg/300 ℃), such as foreign BAYER, GE, Teijin Chemical and other companies are all produced.

The melt index of the brominated polycarbonate is 10-15g/10min, and the bromine content is 52-58%. Among them, halogen can play a role in flame retardancy. 

Acrylic core-shell copolymer (IM) can improve the impact strength of the material.

The particle size of PTFE micropowder is 5-10 microns, which can improve the flame retardancy of the product.

In order to improve the light, heat stability and processing stability of the product, some antioxidants are added to the composition. The antioxidants can choose organic hindered phenols, amines, phosphites, thioesters and other antioxidants. It is a mixture of one or more than two kinds, and the mixing ratio is 1~2:1~2 or 1~2:1~2:1~2; hindered phenols can be tetrakis[β-(3,5-di-tert-butyl Base-4-hydroxy-phenyl) propionate] pentaerythritol ester (referred to as antioxidant 1010), β-(4-hydroxy-3,5-di-tert-butylphenyl) n-octadecyl propionate (referred to as Antioxidant 1076), N, N'-, 6-hexanediyl bis(3,5-bis(1,1 dimethylethyl)-4-hydroxyphenylpropionyl (referred to as antioxidant 1098), 3 , 5-bis(1,1 dimethylethyl)-4-hydroxyphenylpropanoic acid 2-(3,5-bis(1,1 dimethylethyl)-4-hydroxyphenyl)-1-oxo Propyl) hydrazide (abbreviated as antioxidant MD1024), 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene (referred to as Antioxidant 330), 4,4'-thiobis(6-tert-butyl-3-methylphenol) (referred to as antioxidant 300), etc., the amines should be non-polluting p-phenylenediamine systems, such as The reaction product of N-phenylaniline and 2,2,4-trimethylpentene; the phosphite can be triphenyl phosphite (TPP), tri-(nonylphenyl) phosphite (TNPP) , Tris(2,4-di-tert-butylphenyl)phosphite (referred to as antioxidant 168), pentaerythritol bisphosphite di(octadecyl)yl ester (referred to as antioxidant 619), pentaerythritol bisphosphite di( 2,4-di-tert-butylphenyl) ester (referred to as antioxidant 626), etc. Thioesters can be dilauryl thiodipropionate DLTP, or di(octadecyl) thiodipropionate DSTP, etc. .

In order to facilitate the smooth completion of processing modification, that is, to facilitate twin-screw extrusion, a lubricant can be added to the composition. The lubricant is selected from stearyl stearate or oxidized polyolefin wax, hard stearate The lipid esters are pentaerythritol stearate or montanate, and the oxidized polyolefin wax is PE wax or PP wax, preferably stearyl stearate.

The polycarbonate composition with high light reflectivity of the present invention can choose twin-screw extruder or single-screw extruder with static mixer, preferably twin-screw extruder, and the general processing temperature range can be controlled at 250～ between 280°C.

The polycarbonate composition with high light reflectivity described in the invention is used for the production of electronic and electrical components such as LED displays and LCD displays.

The high light reflective polycarbonate composition of the present invention screens various components, and selects suitable PC, brominated polycarbonate, acrylic core-shell copolymer, antioxidant, lubricant for the composition etc., effectively play the advantages of PC, with the characteristics of flame retardancy, high light reflectivity, high temperature resistance, easy molding, good light resistance, etc., used in the production of electronic and electrical components such as LED displays and LCD displays.

The high light reflective polycarbonate composition of the present invention has excellent properties, the tensile yield strength is 50-60MPa, the bending strength is 75-85MPa, the bending modulus is 2300-2500MPa, the Izod notched impact strength is 23°C, 30-50KJ /m2, 120°C baking deformation level 5, flame retardancy VO, 1.0-3.2mm, light reflectance above 95%. (using the ISO standard).

Detailed ways

The following examples further describe the present invention, but the examples are only for illustrating the present invention rather than limiting the present invention.

Example 1

The composition components of this embodiment are: 63 kg of polycarbonate (PC), 5 kg of brominated polycarbonate, 5 kg of acrylic core-shell copolymer (IM), ₁₅ kg of TiO, 0.2 kg of antioxidant 1010 , 0.2 kg of pentaerythritol stearate lubricant, 0.3 kg of PTFE micropowder.

Wherein the polycarbonate melt index is 12g/10min, produced by BAYER company, the melt index of containing brominated polycarbonate is 15g/10min, the bromine content is 55%, the United States Great Lakes company produces, acrylic acid core-shell copolymer (IM) American Rohm Produced by the company, TiO ₂ produced by DuPont, PTFE powder with a particle size of 5 microns, produced by DuPont, the antioxidant was produced by Ciba of Switzerland, and the lubricant was produced by ICI.

The above-mentioned components are mixed evenly, and then extruded and granulated with a twin-screw extruder, and the processing temperature is: 260° C. (plasticizing section).

Example 2

The composition components of this embodiment are: 90 kg of polycarbonate (PC), 3 kg of brominated polycarbonate, 2 kg of acrylic core-shell copolymer (IM), ₁₀ kg of TiO, 0.1 kg of antioxidant 168 , lubricant PE wax 0.3 kg, PTFE powder 0.5 kg.

Wherein the melt index of polycarbonate is 15g/10min, produced by GE Company, the melt index of polycarbonate containing bromide is 12g/10min, the bromine content is 58%, produced by Teijin Chemical Co., Ltd., acrylic acid core-shell copolymer (IM) Japan Mitsubishi Produced by a chemical company, TiO ₂ produced by DuPont, PTFE powder with a particle size of 8 microns, produced by DuPont, the antioxidant was produced by Ciba of Switzerland, and the lubricant was produced by ICI.

The above-mentioned components are mixed evenly, and then extruded and granulated with a twin-screw extruder, and the processing temperature is: 250° C. (plasticizing section).

Example 3

The composition components of this embodiment are: 80 kg of polycarbonate (PC), 4 kg of brominated polycarbonate, 3 kg of acrylic core-shell copolymer (IM), ₅ kg of TiO, 0.3 kg of antioxidant 300 , 0.4 kg of lubricant montanate, 0.4 kg of PTFE micropowder.

The above-mentioned components are mixed evenly, and then extruded and granulated with a twin-screw extruder, and the processing temperature is 270° C. (plasticizing section).

Example 4

With embodiment 1, difference is that each component is: polycarbonate (PC) 70 kilograms, containing brominated polycarbonate 6 kilograms, acrylic core-shell copolymer (IM) 4 kilograms, TiO ₂₅ kilograms, antioxidant 1010 0.2 kg, 1680.15 kg, PP wax 0.2 kg, PTFE micropowder 0.3 kg.

The performance detection result of each composition of embodiment 1-10 is as follows:

test value   Tensile yield strength   Tensile breaking strength Bending strength Flexural modulus Impact strength   120°C baking deformation Light reflectivity Flame retardant VO. MPa MPa MPa MPa KJ/m2 1-5 grades, 5 grades are the best 1-5 grades, 5 grades are the best ISO 527 ISO 527 ISO 178 ISO 178 ISO 178 mm Example 1 55 60 85 2200 55 5 5 1.5 Example 2 60 65 90 2600 45 5 5 3.0 Example 3 62 65 90 2500 46 5 4 3.2 Example 4 58 60 85 2600 40 5 5 1.5

The compositions described in the above embodiments can be used in the production of electronic and electrical parts such as LED displays and LCD displays.

Although the present invention has been described in detail and some specific examples have been cited, it will be obvious for those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

Claims (4)

1. A high light reflective polycarbonate composition, characterized in that, by 63 to 90 parts of polycarbonate, containing 3 to 6 parts of brominated polycarbonate, 2 to 5 parts of acrylic core-shell copolymer, TiO ₂ 5 to 25 parts, 0.1 to 0.3 parts of antioxidant, 0.2 to 0.4 parts of lubricant and 0.3 to 0.5 parts of PTFE micropowder; the melting index of the polycarbonate at 300 ° C and 1.2 kg is 10 to 15 g/10 min The melt index of brominated polycarbonate is 10-15g/10min, and the bromine content is 52-58%; the particle size of PTFE micropowder is 5-10 microns, and the antioxidant is organic hindered phenols, amines, A mixture of one or more of phosphite and thioester antioxidants, the lubricant is pentaerythritol stearate or montanate; ISO standard detection is adopted, the polycarbonate composition The light reflectance is above 95%, the tensile yield strength is 50-60MPa, the bending strength is 75-85MPa, the bending modulus is 2300-2500MPa, the Izod notched impact strength is 23℃, 30-50KJ/m ² , 120℃ baking deformation level 5 , flame retardancy V0, 1.0-3.2mm. 2. The polycarbonate composition according to claim 1, characterized in that, 70 to 90 parts of polycarbonate, 4 to 6 parts of brominated polycarbonate, 3 to 5 parts of acrylic core-shell copolymer, TiO ₂ 10-25 parts, 0.1-0.3 parts of antioxidant, 0.2-0.4 parts of lubricant and 0.3-0.5 parts of PTFE micropowder. 3. The polycarbonate composition according to claim 1 or 2, characterized in that, 80 to 90 parts of polycarbonate, 4 to 6 parts of brominated polycarbonate, 3 to 5 parts of acrylic core-shell copolymer , 15-25 parts of TiO ₂ , 0.1-0.3 parts of antioxidant, 0.2-0.4 parts of lubricant and 0.3-0.5 parts of PTFE micropowder. 4. The application of the polycarbonate composition described in any one of claims 1 to 3 in the production of LED displays, LCD display electronic and electrical components.