CN106995600B - High-reflection low-light-transmission polycarbonate material and preparation method thereof - Google Patents
High-reflection low-light-transmission polycarbonate material and preparation method thereof Download PDFInfo
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- CN106995600B CN106995600B CN201610056557.6A CN201610056557A CN106995600B CN 106995600 B CN106995600 B CN 106995600B CN 201610056557 A CN201610056557 A CN 201610056557A CN 106995600 B CN106995600 B CN 106995600B
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
Abstract
The invention belongs to the technical field of high-molecular modified materials, and relates to a high-reflection low-light-transmittance polycarbonate modified material and a preparation method thereof. The material is prepared from the following components in parts by weight: 70-76.8 parts of polycarbonate, 5-10 parts of toughening agent, 3-10 parts of light diffusing agent, 2-10 parts of light blocking agent, 0.5-2 parts of heat stabilizer, 0.5-2 parts of light stabilizer and 0.2-1 part of lubricant, uniformly mixing, feeding into an internal mixer for extrusion mixing, pressing into 1-5 mm sheets by a film pressing machine, and cutting into granules by a cutter. The material has good component dispersion effect and uniform phase, has excellent light reflectivity and low light transmittance in thinner workpieces, and is suitable for optical parts in the fields of illumination, display, automobiles, aviation and the like.
Description
(I) technical field
The invention belongs to the technical field of high polymer modified materials, and particularly relates to a polycarbonate material with the advantages of high light reflectivity, low light transmittance and the like and a preparation method thereof.
(II) background of the invention
Polycarbonate (PC) is a transparent, amorphous thermoplastic material containing carbonate groups in its molecular chain. The polycarbonate has excellent impact resistance, good mechanical property and electrical insulation property, wide application temperature range, good temperature resistance, high dimensional stability and high creep resistance, and is a typical material integrating rigidity, hardness and toughness in engineering plastics. But also because of its poor crystallization ability, it is an amorphous polymer and thus has excellent transparency.
Because the requirement on the illumination is higher and higher on optical products with high added value, such as automobile driving table instrument lamp covers, LED lamp covers for illumination, display frames, mobile phone frames in the field of electronic appliances and the like, the requirements on the shielding of light are higher, and the high light reflectivity is required to prevent light loss. The use of polycarbonates in these areas is clearly limited.
The prior art chinese patent application No. 200580024644.3 is only a disclosure of composite material, and its processing has limited efficiency by pressing and bonding, and the geometric design of the product is restricted by the processing method. The chinese patent application No. 201010224699.1 is limited to LED light shading panels and only discusses the light transmission performance, does not study the reflection of light, and is a starting point to deal with the problem by using the traditional extrusion granulation processing method. Meanwhile, the prior art only discloses the light-shielding illustration of thicker products (for example, the invention patent of Chinese patent application No. 201310267948.9 is a light-shielding material with the thickness of 2 mm, and the invention patent of Chinese patent application No. 201310449220.8 is a light-shielding material with the thickness of 1 mm at the thinnest).
Disclosure of the invention
In order to solve the technical defects, the invention aims to provide a high-reflection low-light-transmission polycarbonate material and a preparation method thereof. The material processing method can effectively disperse the light diffusant, the light blocking agent and the like in the resin, has better shading effect by using less dosage, and simultaneously has excellent high reflectivity and low light transmittance on the product with thinner thickness.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a high-reflection low-light-transmission polycarbonate material which is prepared from the following components in parts by weight:
polycarbonate (C): 70 to 76.8 parts of (C),
a toughening agent: 5 to 10 parts by weight of a surfactant,
light diffusing agent: 3 to 10 parts of (A) a water-soluble polymer,
light blocking agent: 2 to 10 parts by weight of a stabilizer,
thermal stabilizer: 0.5 to 2 parts by weight of a stabilizer,
light stabilizer: 0.5 to 2 parts by weight of a stabilizer,
lubricant: 0.2-1 part.
The polycarbonate is selected from aromatic polycarbonate, bisphenol A polycarbonate, polycarbonate with molecular weight of 25000-35000, uvioresistant system and bluish phase.
The toughening agent is selected from one or a mixture of more of a series of impact modifiers with a core-shell structure, styrene impact modifiers, thermoplastic elastomers or silicon rubber, wherein the core-shell structure takes a styrene-maleic anhydride copolymer, a butadiene rubber phase as a core and takes styrene and methyl methacrylate as a shell.
The light diffusant is selected from one or a mixture of more of barium sulfate, calcium carbonate and silicon dioxide, and the particle size of the light diffusant is smaller than 0.7 micrometer.
The light blocking agent is selected from titanium dioxide with the rutile titanium dioxide content of more than 94 percent.
The heat stabilizer is selected from one or more of hindered phenol heat stabilizer, thioester heat stabilizer and phosphite heat stabilizer.
The light stabilizer is selected from one or a mixture of more of benzophenone light stabilizer, benzotriazole light stabilizer and benzotriazole light stabilizer.
The lubricant is selected from one or a mixture of more of solid paraffin, liquid paraffin, low molecular weight polyethylene, stearic acid amide, methylene bis stearic acid amide and ethylene bis stearic acid amide.
The invention also provides a preparation method of the high-reflection low-light-transmission polycarbonate material, which comprises the following steps:
uniformly mixing 70-76.8 parts of polycarbonate, 5-10 parts of toughening agent, 3-10 parts of light diffusing agent, 2-10 parts of light blocking agent, 0.5-2 parts of heat stabilizer, 0.5-2 parts of light stabilizer and 0.2-1 part of lubricant, feeding the mixture into an internal mixer for extrusion and mixing, pressing the mixture into 1-5 mm sheets by a film pressing machine, and cutting the sheets into granules by a cutter.
The temperature of the internal mixer is 240-280 ℃, and the rotating speed of the rotor of the internal mixer is 20-80 r/min.
The material has good dispersion effect and uniform phase, has excellent light reflectivity and low light transmittance in thinner workpieces, and is suitable for optical parts in the fields of illumination, display, automobiles, aviation and the like.
Compared with the prior art, the method has the following advantages:
1. the light transmittance of the polycarbonate material is obviously reduced, the light reflectivity is obviously improved, and the polycarbonate material can play excellent reflection and shading effects on thinner products.
2. The technical route of the light diffusant and the light blocking agent for improving the light reflectivity and reducing the light transmissivity is found, and the success rate of material development is improved.
3. By adopting a new production process, the dispersion effect of the light diffusant and the light blocking agent in the resin is effectively improved, the dosage of the light diffusant and the light blocking agent is reduced, and the cost is reduced.
(IV) detailed description of the preferred embodiments
The present invention is further illustrated by the following specific examples.
The raw materials used in the following examples were:
the polycarbonate was PC2407 from Bayer.
The toughening agent is a Brillouin MBS core-shell type toughening agent with the mark of M511.
The light diffusion agent is selected from ultra-fine barium sulfate with particle size of 0.5 micrometer (25000 mesh) of CIMBAR in USA, barium sulfate with particle size of 5.5 micrometer (2500 mesh) of CIMBAR, fine calcium carbonate with particle size of 0.5 micrometer (25000 mesh) and calcium carbonate with particle size of 7.5 micrometer (2000 mesh) on market.
The light blocking agent is selected from Bameng R-760 brand rutile type titanium dioxide and Nanjing titanium dioxide chemical NA100 brand anatase type titanium dioxide.
The heat stabilizer is composed of hindered phenol (AO-50 in Vinca chemical industry) and phosphite (2112 in Vinca chemical industry) (weight ratio AO-50: 2112 is 1: 2).
The light stabilizer is hindered amine (LA-944 in chemical engineering of Catharanthus roseus) and benzotriazole (UV-360 in chemical engineering of Catharanthus roseus).
The lubricant is domestic EBS and is sold in the market.
The physical property test standard of the acrylonitrile-butadiene-styrene composite material with high heat resistance and low light transmittance provided by the embodiment of the invention is shown in the table 1.
TABLE 1 test standards for physical Properties of materials
| Physical Properties | Test method |
| Tensile strength | ISO 527 |
| Bending strength | ISO 178 |
| Flexural modulus | ISO 178 |
| Light reflectivity | DIN 5033 |
| Transmittance of light | ISO 13468 |
Example 1
70 parts of PC2407, 5 parts of M511, 10 parts of a mixture of ultrafine barium sulfate and fine calcium carbonate (the weight ratio of the ultrafine barium sulfate to the fine calcium carbonate is 2:1), 10 parts of R-760, 2 parts of a heat stabilizer, 2 parts of a light stabilizer (LA-9441.2 parts, UV-3600.8 parts) and 1 part of a lubricant are stirred and mixed uniformly at a high speed, the mixture is fed into an internal mixer, fully melted and mixed under the stirring and shearing action of a rotor, pressed into 2 mm sheets by a film pressing machine, and then cut into granules by a cutter.
The internal mixer temperature was 240 ℃ and the internal mixer rotor speed was 75 rpm.
The prepared material was injection molded into test standard bars in standard sizes, and the results of the performance tests are shown in Table 2.
Comparative example 1
70 parts of PC2407, 5 parts of M511, 10 parts of a mixture of ultrafine barium sulfate and fine calcium carbonate (the weight ratio of the ultrafine barium sulfate to the fine calcium carbonate is 2:1), 10 parts of R-760, 2 parts of a heat stabilizer, 2 parts of a light stabilizer (LA-9441.2 parts, UV-3600.8 parts) and 1 part of a lubricant are stirred at a high speed and mixed uniformly, the mixture is fed into a double-screw extruder, and is fully melted and mixed under the conveying and shearing action of a screw, and then is extruded, pulled into strips, cooled and cut into granules through a die of a machine head.
The temperature of each section of the screw of the double-screw extruder is controlled between 240 ℃, and the rotating speed of the screw is 350 revolutions per minute.
The prepared material was injection molded into test standard bars in standard sizes, and the results of the performance tests are shown in Table 2.
Example 2
75.8 parts of PC2407, 10 parts of M511, 3 parts of a mixture of ultrafine barium sulfate and fine calcium carbonate (the weight ratio of the two is 2:1), 10 parts of R-760, 0.5 part of a heat stabilizer, 0.5 part of a light stabilizer (LA-9440.3 parts and UV-3600.2 parts) and 0.2 part of a lubricant are stirred and mixed uniformly at a high speed, the mixture is fed into an internal mixer, fully melted and mixed under the stirring and shearing action of a rotor, pressed into 2 mm slices by a film pressing machine, and then cut into granules by a cutter.
The internal mixer temperature was 280 ℃ and the internal mixer rotor speed was 75 rpm.
The prepared material was injection molded into test standard bars in standard sizes and the results of the performance tests are shown in Table 3.
Comparative example 2
75.8 parts of PC2407, 10 parts of M511, 3 parts of a mixture of ultrafine barium sulfate and fine calcium carbonate (the weight ratio of the two is 2:1), 10 parts of NA100, 0.5 part of a heat stabilizer, 0.5 part of a light stabilizer (LA-9440.3 parts and UV-3600.2 parts) and 0.2 part of a lubricant are stirred and mixed uniformly at a high speed, the mixture is fed into an internal mixer, fully melted and mixed under the stirring and shearing action of a rotor, pressed into 2 mm slices by a film pressing machine, and then cut into granules by a cutter.
The internal mixer temperature was 280 ℃ and the internal mixer rotor speed was 75 rpm.
The prepared material was injection molded into test standard bars in standard sizes and the results of the performance tests are shown in Table 3.
Example 3
76.8 parts of PC2407, 10 parts of M511, 10 parts of ultrafine barium sulfate, 2 parts of R-760, 0.5 part of heat stabilizer, 0.5 part of light stabilizer (LA-9440.3 parts, UV-3600.2 parts) and 0.2 part of lubricant are stirred and mixed uniformly at high speed, the mixture is fed into an internal mixer, fully melted and mixed under the stirring and shearing action of a rotor, and then pressed into 2 mm slices by a film pressing machine, and then cut into granules by a cutter.
The internal mixer temperature was 260 ℃ and the internal mixer rotor speed was 75 rpm.
The prepared material was injection molded into test standard bars in standard sizes and the results of the performance tests are shown in Table 4.
Comparative example 3
76.8 parts of PC2407, 10 parts of M511, 10 parts of barium sulfate, 2 parts of R-760, 0.5 part of heat stabilizer, 0.5 part of light stabilizer (LA-9440.3 parts, UV-3600.2 parts) and 0.2 part of lubricant are stirred and mixed uniformly at high speed, the mixture is fed into an internal mixer, fully melted and mixed under the stirring and shearing action of a rotor, and then pressed into 2 mm slices by a film pressing machine, and then cut into granules by a cutter.
The internal mixer temperature was 260 ℃ and the internal mixer rotor speed was 75 rpm.
The prepared material was injection molded into test standard bars in standard sizes and the results of the performance tests are shown in Table 4.
TABLE 2 test results of Material Properties
| Example 1 | Comparative example 1 | |
| Tensile Strength (MPa) | 81 | 80 |
| Flexural Strength (MPa) | 125 | 127 |
| Flexural modulus (MPa) | 2820 | 2850 |
| Reflectance (%) | 96 | 88 |
| Transmittance (%) [ 0.5mm ] | 0.1 | 1.6 |
TABLE 3 test results of Material Properties
| Example 2 | Comparative example 2 | |
| Tensile Strength (MPa) | 68 | 64 |
| Flexural Strength (MPa) | 108 | 101 |
| Flexural modulus (MPa) | 2510 | 2480 |
| Reflectance (%) | 94 | 84 |
| Transmittance (%) [ 0.5mm ] | 0.4 | 1.2 |
TABLE 4 test results of Material Properties
| Example 3 | Comparative example 3 | |
| Tensile Strength (MPa) | 72 | 68 |
| Flexural Strength (MPa) | 114 | 110 |
| Flexural modulus (MPa) | 2680 | 2620 |
| Reflectance (%) | 92 | 83 |
| Transmittance (%) [ 0.5mm ] | 0.3 | 1 |
The light reflectivity and the light shielding performance of the high-reflection low-transmittance polycarbonate material prepared by the embodiment are obviously improved. Table 2 shows that the light reflectivity and the light shielding performance of the material processed by the internal mixer are obviously superior to those of the material processed by the double-screw extrusion method, the reflectivity is improved by 9 percent, and the transmissivity is reduced by 94 percent. Table 3 the material of rutile titanium dioxide of the present invention has light reflectivity and shading performance obviously superior to those of anatase titanium dioxide, reflectivity increased by 12%, and transmissivity decreased by 67%. Table 4 the light reflectivity and light-shielding performance of the light diffuser material with 0.5 μm particle size selected in the invention are obviously superior to those of the common particle size, the light reflectivity is improved by 11%, and the transmittance is reduced by 70%.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. A high-reflection low-light-transmission polycarbonate material is characterized in that: the composition is prepared from the following components in parts by weight:
polycarbonate (C): 70 to 76.8 parts of (C),
a toughening agent: 5 to 10 parts by weight of a surfactant,
light diffusing agent: 3 to 10 parts of (A) a water-soluble polymer,
light blocking agent: 2 to 10 parts by weight of a stabilizer,
thermal stabilizer: 0.5 to 2 parts by weight of a stabilizer,
light stabilizer: 0.5 to 2 parts by weight of a stabilizer,
lubricant: 0.2-1 part;
the light diffusant is selected from one or a mixture of more of barium sulfate, calcium carbonate and silicon dioxide, and the particle size is less than 0.7 micron;
the light blocking agent is selected from rutile type titanium dioxide with titanium dioxide content more than 94%;
the preparation method of the high-reflection low-light-transmission polycarbonate material comprises the following steps:
(1) weighing the raw materials of the components according to the weight parts, and uniformly mixing the polycarbonate, the toughening agent, the light diffusing agent, the light blocking agent, the heat stabilizer, the light stabilizer and the lubricant;
(2) and (2) feeding the mixed material obtained in the step (1) into an internal mixer for extruding and mixing, then pressing into a sheet with the thickness of 1-5 mm by using a film pressing machine, and then cutting into granules by using a cutter.
2. The polycarbonate material of claim 1, wherein: the selected polycarbonate is selected from aromatic polycarbonate, bisphenol A polycarbonate, polycarbonate with molecular weight of 25000-35000, ultraviolet resistant system and bluish phase.
3. The polycarbonate material of claim 1, wherein: the selected toughening agent is selected from one or a mixture of more of a series of impact modifiers with a core-shell structure, styrene impact modifiers, thermoplastic elastomers or silicon rubber, wherein the core is made of a styrene-maleic anhydride copolymer, a butadiene rubber phase and a shell is made of styrene and methyl methacrylate.
4. The polycarbonate material of claim 1, wherein: the selected heat stabilizer is selected from one or more of hindered phenol heat stabilizer, thioester heat stabilizer and phosphite heat stabilizer.
5. The polycarbonate material of claim 1, wherein: the light stabilizer is selected from one or a mixture of more of benzophenone light stabilizer, benzotriazole light stabilizer and benzotriazole light stabilizer.
6. The polycarbonate material of claim 1, wherein: the selected lubricant is selected from one or more of solid paraffin, liquid paraffin, low molecular weight polyethylene, stearic acid amide, methylene bis stearic acid amide and ethylene bis stearic acid amide.
7. The polycarbonate material of any one of claims 1 to 6, wherein: in the step (2), the temperature of the internal mixer is 240-280 ℃, and the rotating speed of the rotor of the internal mixer is 20-80 r/min.
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| CN109337330B (en) * | 2018-09-10 | 2020-06-05 | 广东聚石化学股份有限公司 | Halogen-free flame-retardant high-shading PC composite material and preparation method thereof |
| CN110655774A (en) * | 2019-07-23 | 2020-01-07 | 佛山市鑫桥科技有限公司 | High-reflection PC reflection master batch and preparation method thereof |
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| CN102585468A (en) * | 2011-01-06 | 2012-07-18 | 合肥杰事杰新材料股份有限公司 | Highly heat-resisting flame-retardant antistatic PC (polycarbonate)/ABS (Acrylonitrile Butadiene Styrene) alloy material and preparation method thereof |
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