CN112724631A - High-shading and high-reflection polycarbonate composite material and preparation method thereof - Google Patents
High-shading and high-reflection polycarbonate composite material and preparation method thereof Download PDFInfo
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- CN112724631A CN112724631A CN202011518782.XA CN202011518782A CN112724631A CN 112724631 A CN112724631 A CN 112724631A CN 202011518782 A CN202011518782 A CN 202011518782A CN 112724631 A CN112724631 A CN 112724631A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The invention relates to a high shading and high reflecting polycarbonate composite material and a preparation method thereof, wherein the high shading and high reflecting polycarbonate composite material comprises the following components in parts by weight: 75-95 parts of polycarbonate, 1-10 parts of a reflection enhancer, 3-15 parts of titanium dioxide and 0.1-1 part of polytetrafluoroethylene; the reflection reinforcing agent is glass beads treated by titanate coupling agent, and the weight average molecular weight of the polytetrafluoroethylene is 400-500W; the preparation method of the high shading and high reflecting polycarbonate composite material comprises the following steps: (1) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; (2) and putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material. The method is simple and easy to implement, and the prepared high-shading high-reflection polycarbonate composite material has the advantages of smooth product surface, better light source shading property, high light reflectivity and low cost, and can be widely applied to the fields of LED light source reflection cups, shading panels and the like.
Description
Technical Field
The invention belongs to the technical field of polycarbonate composite materials, and relates to a high-shading and high-reflection polycarbonate composite material and a preparation method thereof.
Background
Polycarbonate (PC) has high mechanical strength, good impact resistance, excellent transparency and the like, and is widely used as an engineering plastic in various fields such as household appliances and electronic devices.
In parts such as a backlight reflector used for an LED reflector material, a liquid crystal display and the like, and thin-wall forming parts with the wall thickness of 2mm or less of products, a large amount of phosphorus flame retardant or bromine flame retardant is required to be added to meet the requirements of flame retardance and high reflectivity. These articles are often required not to leak light, in addition to high reflectivity requirements, and high opacity is required, and the addition of high proportions of titanium dioxide is an effective means of improving opacity. Generally, 2mm injection-molded samples achieve full light-shading effect (the light-shading rate is more than 99%), and the addition amount of titanium dioxide needs to be at least more than 25%, however, too high proportion of titanium dioxide can accelerate the catalytic degradation of polycarbonate resin matrix, which not only causes the reduction of light reflectivity, but also causes the movement of polycarbonate molecular chains to be blocked and the reduction of impact property due to too high mineral filling, and also causes the degradation of mechanical strength due to the reduction of degradation molecular weight of polycarbonate.
Chinese patent CN105968771B discloses a high flame-retardant, high-strength and high-reflection polycarbonate material, which is prepared from the following raw materials in percentage by mass: 10-75% of polycarbonate, 0.05-10% of flame retardant, 0.1-0.8% of anti-dripping agent, 25-75% of reflective master batch, 1-10% of flexibilizer, 0.2-1% of anti-ultraviolet agent, 0.2-1% of antioxidant and 0.2-5% of lubricant; the light-reflecting master batch is composed of a light-reflecting agent, a coupling agent, polycarbonate and an auxiliary agent in a mass ratio of 40: 7.5-17.5: 37-57: 0.1-5. The material has good light shielding and reflecting functions, the titanium dioxide master batch method is used as a light reflecting agent, the titanium dioxide addition amount is large, the surface treating agent is damaged after secondary granulation, and polycarbonate causes thermal degradation to a certain degree, so that the mechanical property of the material is reduced.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provide a high-shading and high-reflection polycarbonate composite material and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high shading and high reflecting polycarbonate composite material comprises the following components in parts by weight:
the reflection enhancer is glass beads treated by a titanate coupling agent;
the molecular weight of the polytetrafluoroethylene is 400W-500W (namely 400 ten thousand-500 ten thousand); if the weight average molecular weight is lower than 400W, the polytetrafluoroethylene is easier to migrate to the surface and cannot be in a fibrous shape under the action of shearing force; if the weight average molecular weight is higher than 500W, the melt viscosity is too high to extrude;
the light transmittance of the high-shading and high-reflection polycarbonate composite material is 0-10% (the light transmittance is obtained by testing according to GB/T2410-2008), and the reflectivity is 92-95% (the reflectivity is obtained by testing a D65 light source at an incidence angle of 10 degrees).
As a preferred technical scheme:
the polycarbonate composite material with high light-shielding and high reflection is characterized in that the titanate coupling agent is tetraisopropylbis (dioctyl phosphite acyloxy) titanate.
According to the high-shading and high-reflection polycarbonate composite material, the rounding rate of the glass beads is more than 90%, the particle size is 1-10 mu m, and the refractive index is 1.5-2.1.
The polycarbonate composite material with high light shielding and high reflection has the melt index of 10-15 g/10min and the refractive index of 1.4-1.6 under the test conditions of 300 ℃ and 1.2 kg; when the melt index is less than 10g/min, the dispersion of the filling powder is not facilitated, the filling powder is seriously accumulated locally, and when the melt index is more than 15g/10min, although the dispersion is improved, the impact performance is seriously influenced.
The polycarbonate composite material with high light shielding and high reflection is characterized in that the titanium dioxide is scaly rutile titanium dioxide coated with SAN (styrene-acrylonitrile copolymer).
According to the polycarbonate composite material with high light shielding and high reflection, the particle size of the titanium dioxide is 100-400 meshes, and preferably 100-150 meshes.
The high shading and high reflecting polycarbonate composite material has the impact strength of 10-40 KJ/m2。
The invention also provides a method for preparing the high shading and high reflecting polycarbonate composite material, which comprises the following steps:
(1) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 50-200 r/min;
(2) and putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material.
As a preferred technical scheme:
according to the method, the mixing time in the step (1) is 6-10 min;
in the step (2), the rotating speed of the double-screw machine is 200-400 rpm, and the extrusion temperature is 240-280 ℃.
The principle of the invention is as follows:
the invention adopts the glass beads as the light reflection reinforcing agent, the refractive index of the glass beads is similar to that of polycarbonate resin, the light transmission of the glass beads is not influenced, when light irradiates the glass beads, the light enters the glass beads and is completely reflected back along the incident path direction by utilizing the convex lens reflection principle, the loss of the light is reduced, and the reflection performance of the material is improved;
according to the invention, polytetrafluoroethylene with the weight-average molecular weight of 400W-500W is selected as a modifier, and is in a fibrous state in a polycarbonate resin matrix under the shearing action of a screw, so that polycarbonate molecular chains are oriented along the flowing direction, the arrangement direction of the original molecular chains is changed, the light refraction angle is changed, and the transmitted light is reduced, on the other hand, because the flaky titanium dioxide powder is oriented along the fiber direction, the area of a reflecting surface is increased (the titanium dioxide is in a flaky structure, if the non-oriented titanium dioxide is randomly distributed in a disordered way, the oriented flaky structure faces a light incidence surface, and the reflecting area is relatively increased);
according to the invention, the titanate coupling agent is selected as the treating agent to treat the surfaces of the glass beads, so that the compatibility of the glass beads and the polycarbonate resin is improved, gaps between the glass beads and the polycarbonate resin and between the titanium dioxide powder and the polycarbonate resin are further reduced, the dispersion distribution of the powder is facilitated, local agglomeration is avoided, the probability of powder interconnection is increased, and the use amount of the titanium dioxide powder can be greatly reduced. In addition, the titanate coupling agent is tetraisopropyl di (dioctyl phosphite acyloxy) titanate, so that the compatibility can be improved, the titanate coupling agent has phosphite acyloxy groups, the thermal stability of the material can be improved, and the defects that an antioxidant containing phosphite groups in the prior art is low in melting point, easy to absorb water and accelerate PC degradation and the like are overcome.
Has the advantages that:
(1) the preparation method of the high shading and high reflecting polycarbonate composite material has the advantages of simple process and strong feasibility;
(2) the high shading and high reflecting polycarbonate composite material has the advantages of smooth product surface, better light source shielding property, high light reflectivity and low cost, and can be widely applied to the fields of LED light source reflecting cups, shading panels and the like.
Detailed Description
The invention will be further illustrated with reference to specific embodiments. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
In the embodiment of the invention, the particle size of the titanium dioxide is 100-400 meshes;
the light transmittance is measured according to GB/T2410-2008 standard, and the reflectivity is measured by using a D65 light source and measuring the incident angle of 10 degrees.
Example 1
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
75 parts of polycarbonate;
1 part of a reflection enhancer;
3 parts of titanium dioxide;
0.1 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate is 10g/10min under the test conditions of 300 ℃ and 1.2kg, and the refractive index is 1.4;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the rounding rate of the glass beads is 90%, the particle size is 1 mu m, and the refractive index is 1.5;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 400W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 50 rpm; mixing for 6 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the rotation speed of the twin-screw extruder was 200 rpm and the extrusion temperature was 240 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 10 percent, the reflectivity of 87 percent and strong impactThe degree is 38KJ/m2。
Example 2
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
80 parts of polycarbonate;
2 parts of a reflection enhancer;
5 parts of titanium dioxide;
0.2 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate at 300 ℃ under the test condition of 1.2kg is 11g/10min, and the refractive index is 1.4;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the glass beads have a rounding rate of 91%, a particle size of 2 μm and a refractive index of 1.6;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 410W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 80 rpm; mixing for 7 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the twin-screw extruder was operated at 230 rpm and the extrusion temperature was 250 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 8 percent, the reflectivity of 91 percent and the impact strength of 34KJ/m2。
Example 3
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
83 parts of polycarbonate;
3 parts of a reflection enhancer;
7 parts of titanium dioxide;
0.3 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate is 12g/10min under the test conditions of 300 ℃ and 1.2kg, and the refractive index is 1.4;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the rounding rate of the glass beads is 92%, the particle size is 3 mu m, and the refractive index is 1.7;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 430W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 200 r/min; mixing for 8 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the rotation speed of the twin-screw extruder is 260 rpm, and the extrusion temperature is 255 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 6 percent, the reflectivity of 94 percent and the impact strength of 31KJ/m2。
Example 4
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
87 parts of polycarbonate;
4 parts of a reflection enhancer;
10 parts of titanium dioxide;
0.5 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate is 13g/10min under the test conditions of 300 ℃ and 1.2kg, and the refractive index is 1.5;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the glass beads have a rounding rate of 93%, a particle size of 4 μm and a refractive index of 1.8;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 450W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 200 r/min; mixing for 8 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the rotation speed of the twin-screw machine is 300 rpm, and the extrusion temperature is 260 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 3 percent, the reflectivity of 94 percent and the impact strength of 24KJ/m2。
Example 5
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
89 parts of polycarbonate;
6 parts of a reflection enhancer;
12 parts of titanium dioxide;
0.7 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate is 13g/10min under the test conditions of 300 ℃ and 1.2kg, and the refractive index is 1.5;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the rounding rate of the glass beads is 94%, the particle size is 5 mu m, and the refractive index is 1.9;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 470W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 200 r/min; mixing for 8 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the speed of the twin-screw extruder was 330 rpm and the extrusion temperature was 265 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 1 percent, the reflectivity of 95 percent and the impact strength of 21KJ/m2。
Example 6
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
90 parts of polycarbonate;
7 parts of a reflection enhancer;
14 parts of titanium dioxide;
0.9 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate at 300 ℃ under the test condition of 1.2kg is 14g/10min, and the refractive index is 1.6;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the rounding rate of the glass beads is 95%, the particle size is 6 mu m, and the refractive index is 2;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 490W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 200 r/min; mixing for 9 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the rotation speed of the twin-screw extruder is 360 rpm, and the extrusion temperature is 270 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 0 percent, the reflectivity of 92 percent and strong impactDegree of 19KJ/m2。
Example 7
A preparation method of a high shading and high reflection polycarbonate composite material comprises the following specific steps:
(1) preparing raw materials; the weight parts of the components are as follows:
95 parts of polycarbonate;
10 parts of a reflection enhancer;
15 parts of titanium dioxide;
1 part of polytetrafluoroethylene;
wherein the melt index of the polycarbonate is 15g/10min under the test conditions of 300 ℃ and 1.2kg, and the refractive index is 1.6;
the reflection enhancer is glass beads treated by a titanate coupling agent; the titanate coupling agent is tetraisopropyl di (dioctyl acyloxy phosphite) titanate; the rounding rate of the glass beads is 96%, the particle size is 7 mu m, and the refractive index is 2.1;
the titanium dioxide is scaly rutile titanium dioxide which is coated by SAN;
the weight average molecular weight of the polytetrafluoroethylene is 500W;
(2) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 150 rpm; mixing for 10 min;
(3) putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material; the rotation speed of the twin-screw extruder was 400 rpm and the extrusion temperature was 280 ℃.
The prepared high-shading high-reflection polycarbonate composite material has the light transmittance of 0 percent, the reflectivity of 93 percent and the impact strength of 15KJ/m2。
Claims (9)
1. The high shading and high reflecting polycarbonate composite material is characterized by comprising the following components in parts by weight:
the reflection enhancer is glass beads treated by a titanate coupling agent;
the weight average molecular weight of the polytetrafluoroethylene is 400-500W;
the light transmittance of the high-shading high-reflection polycarbonate composite material is 0-10%, and the reflectivity is 92-95%.
2. The polycarbonate composite material with high light-shielding and high reflection of claim 1, wherein the titanate coupling agent is tetraisopropylbis (dioctylphosphite acyloxy) titanate.
3. The polycarbonate composite material with high light-shielding and high reflection of claim 1, wherein the glass beads have a rounding rate of more than 90%, a particle size of 1-10 μm, and a refractive index of 1.5-2.1.
4. The polycarbonate composite material with high light shielding and high reflection of claim 1, wherein the polycarbonate has a melt index of 10-15 g/10min and a refractive index of 1.4-1.6 under a test condition of 1.2kg at 300 ℃.
5. The polycarbonate composite material with high light-shielding and high reflection of claim 1, wherein the titanium dioxide is SAN-coated scaly rutile titanium dioxide.
6. The polycarbonate composite material with high light-shielding and high reflection of claim 5, wherein the titanium dioxide has a particle size of 100-400 meshes.
7. The polycarbonate composite material with high light shielding and high reflection of claim 1, wherein the polycarbonate composite material with high light shielding and high reflection has an impact strength of 10-40 KJ/m2。
8. The method for preparing the polycarbonate composite material with high light shielding and high reflection as described in any one of claims 1 to 7, characterized by comprising the following steps:
(1) mixing the raw materials of polycarbonate, a reflection enhancer, titanium dioxide and polytetrafluoroethylene in a high-speed mixer and then discharging; the mixing speed of the high-speed mixer is 50-200 r/min;
(2) and putting the mixed raw materials into a double-screw extruder for extrusion granulation to prepare the high-shading high-reflection polycarbonate composite material.
9. The method according to claim 8, wherein the mixing time in the step (1) is 6-10 min;
in the step (2), the rotating speed of the double-screw machine is 200-400 rpm, and the extrusion temperature is 240-280 ℃.
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