CN116102864A - Preparation method of super-dispersed PC light diffusion master batch - Google Patents
Preparation method of super-dispersed PC light diffusion master batch Download PDFInfo
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- CN116102864A CN116102864A CN202211710318.XA CN202211710318A CN116102864A CN 116102864 A CN116102864 A CN 116102864A CN 202211710318 A CN202211710318 A CN 202211710318A CN 116102864 A CN116102864 A CN 116102864A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
Abstract
The invention relates to the technical field of super-dispersed PC light diffusion master batch, and discloses a preparation method of the super-dispersed PC light diffusion master batch, which comprises the following preparation steps: 1) Providing 90-99% of PC resin, 0.05-5% of light dispersing agent, 0.01-2% of antioxidant and 0.1-3% of dispersing agent according to mass percentage; placing the light dispersing agent, the antioxidant and the dispersing agent into a mixer to be mixed to form a mixture; 2) Placing the mixture and PC resin into a stirrer to stir to form a stirring material; 3) Placing the stirring material into a double-screw extruder for extrusion granulation to form ultra-dispersed PC light diffusion master batch; the light diffusion agent is uniformly dispersed, and the formed ultra-dispersed PC light diffusion master batch has better physical parameters and product comprehensive performance.
Description
Technical Field
The invention relates to the technical field of super-dispersed PC light diffusion master batches, in particular to a preparation method of the super-dispersed PC light diffusion master batches.
Background
The light diffusion master batch is prepared by adding a light diffusion agent into a base material resin, and utilizing the refractive index difference between the light diffusion agent and the base material resin to enable light to be diffusely reflected at the interface between the light diffusion agent and the base material resin, so that the atomization of a point light source into a uniform surface light source is realized, and the light diffusion effect is achieved.
At present, light diffusion agents used in the LED lighting industry generally adopt two methods for achieving the purpose of light diffusion, wherein the methods are as follows:
1) The light diffusion agent such as organic silicon, acrylic acid and the like is subjected to full particle extraction modification, namely, the raw materials such as organic silicon, acrylic acid and the like are required to be mixed and then are subjected to full particle extraction, and then are subjected to melting, injection molding or blow molding, so that the manufacturing cost is high, and the physical property parameters and the product comprehensive performance of the light diffusion master batch are reduced by about 8 percent after the full particle extraction modification process, so that the performance is poor;
2) The method has low cost by adding the light dispersing agent for injection molding or blow molding, but the direct addition of the light dispersing agent can lead to uneven dispersion of the light dispersing agent. Because the light diffusion master batch is a light-transmitting product, if the light diffusion agent is unevenly dispersed, after the LED lamp is lightened, the diagonal position of the glue inlet of the LED lamp has obvious mixed lines, and even the LED lamp shade has fan-shaped non-dispersed patterns, so that the lighting effect is greatly reduced.
In the prior art, in the process of preparing the light diffusion master batch, the light diffusion agent is directly mixed in the PC resin, but the light diffusion agent has the defect of uneven dispersion in the PC resin.
Disclosure of Invention
The invention aims to provide a preparation method of super-dispersed PC light diffusion master batch, and aims to solve the problem of uneven dispersion of a light diffusion agent in PC resin in the prior art.
The invention discloses a preparation method of an ultra-dispersed PC light diffusion master batch, which comprises the following preparation steps:
1) Providing 90-99% of PC resin, 0.05-5% of light dispersing agent, 0.01-2% of antioxidant and 0.1-3% of dispersing agent according to mass percentage; the light dispersing agent, the antioxidant and the dispersing agent are in solid particles, and the PC resin is in a fluid state;
placing the light dispersing agent, the antioxidant and the dispersing agent into a mixer for uniform mixing to form a mixture; the mixing machine is provided with a mixing cavity, the light dispersing agent, the antioxidant and the dispersing agent are sequentially blown into the mixing cavity at high pressure, and in the mixing cavity, the light dispersing agent, the antioxidant and the dispersing agent are blown into a suspension state by flowing gas to be mixed;
2) Placing the mixture and PC resin into a stirrer to be uniformly stirred to form a stirring material;
3) And placing the stirring material into a double-screw extruder for extrusion granulation to form the ultra-dispersed PC light diffusion master batch.
Further, the PC resin has a melt index of between 5MI and 80 MI.
Further, the light dispersing agent is at least one of organic silicon and acrylic acid, and the particle size of the light dispersing agent is between 1 and 15 mu m.
Further, the dispersing agent is one or more of paraffin, high molecular wax, aliphatic multifunctional modifier, polyalcohol compound and fatty acid.
Further, the antioxidant is a hindered phenol antioxidant or an auxiliary antioxidant.
Furthermore, the transmittance of the super-dispersed PC light diffusion master batch is more than or equal to 92%.
Further, the mixer comprises a mixing barrel, wherein the mixing barrel is internally provided with the mixing cavity which is longitudinally arranged; three feeding cavities which respectively and correspondingly contain a light dispersing agent, an antioxidant and a dispersing agent are arranged on the outer side wall of the mixing barrel;
the three feeding cavities are circumferentially arranged along the circumferential space of the mixing cavity, and are staggered up and down along the axial direction of the mixing cavity; the inner end of the feeding cavity is communicated with the mixing cavity, and the outer end of the feeding cavity is connected with the high-pressure air pipe;
the top of the mixing cavity is provided with a blowing cavity which blows air downwards, and an upper isolation plate which limits the mixture to enter the blowing cavity is arranged between the blowing cavity and the mixing cavity; the air blowing cavity is communicated with the upper air blowing machine through an air pipe so that the air blowing cavity is in a high-pressure state, and an upper air blowing hole for blowing air in the air blowing cavity into the mixing cavity is formed in the upper partition plate;
the bottom of the mixing cavity is provided with an air blowing cavity which blows air upwards, and a lower isolation plate which limits the mixture to fall into the air blowing cavity is arranged between the air blowing cavity and the mixing cavity; the air blowing cavity is communicated with the lower air blowing machine through an air pipe so as to be in a high-pressure state, and the lower partition plate is internally provided with a lower air blowing hole for blowing air in the air blowing cavity into the mixing cavity; the gas pressure in the feeding cavity is respectively greater than the gas pressure in the air blowing cavity and the gas pressure in the air blowing cavity;
in the preparation step 1), the light dispersing agent, the antioxidant and the dispersing agent are respectively and correspondingly arranged in three feeding cavities, when the upper blowing machine blows air from top to bottom in the mixing cavity through the air blowing cavity, the lower blowing machine blows air from bottom to top in the mixing cavity through the air blowing cavity, the light dispersing agent, the antioxidant and the dispersing agent are respectively blown into the mixing cavity by utilizing the high-pressure air pipe in sequence, and the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity and are mixed by air blowing in the mixing cavity.
Further, the inner end of the feeding cavity extends spirally along the outer side wall of the mixing barrel, a feeding channel in strip arrangement is formed, and the width of the feeding channel gradually decreases along the spiral direction of the feeding channel;
a plurality of feeding holes for light dispersing agents or antioxidants or dispersing agents to pass through are formed in the mixing barrel, the feeding holes are aligned with the feeding channels and are arranged at intervals along the spiral direction of the feeding channels, and the feeding channels are communicated with the mixing cavity through the feeding holes;
in the preparation step 1), in the process of injecting high-pressure gas into the feeding cavity by the high-pressure gas pipe, the light dispersing agent or the antioxidant or the dispersing agent in the feeding cavity moves along the feeding channel under the pushing of the high-pressure gas and is blown away into the mixing cavity through the feeding hole.
Further, the upper isolation plate and the lower isolation plate are arranged vertically opposite, and a plurality of upper air blowing holes are arranged around the center of the upper isolation plate at intervals to form an upper air blowing ring; the lower partition plate is distributed with lower air-blowing holes, and a plurality of lower air-blowing holes form a lower air-blowing ring at the circumferential edge of the lower partition plate;
the diameter of the lower air-blowing ring is larger than that of the upper air-blowing ring, and the upper air-blowing ring is positioned in the surrounding area of the lower air-blowing ring along the direction opposite to the upper direction and the lower direction; the gas pressure in the air blowing cavity is larger than the gas pressure in the air blowing cavity;
a plurality of ventilation holes are formed in the side wall of the transformer tube, and the diameters of the ventilation holes are respectively smaller than the diameters of the light diffusion agent, the antioxidant and the dispersing agent; the bottom of the pressure changing pipe downwards penetrates through the air blowing cavity, extends to the bottom of the mixing barrel and is in closed arrangement; the top of the pressure changing pipe upwards penetrates through the air blowing cavity, extends to the top of the mixing barrel and is communicated with the air sucking equipment;
in the preparation step 1), when the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity for mixing, the air sucking device alternately performs air blowing operation and air sucking operation on the pressure changing pipe; in the process of blowing operation, the suction gas device blows high-pressure gas into the pressure-changing pipe so as to enable the pressure-changing pipe to be in a high-pressure state; and in the process of carrying out the air suction operation, the air suction device sucks air in the pressure changing pipe so as to enable the pressure changing pipe to be in a low-pressure state.
Further, a moving sleeve which moves up and down along the transformer tube is sleeved on the periphery of the transformer tube, and a plurality of stirring sheets which elastically swing horizontally are arranged on the periphery of the moving sleeve; the inner ends of the stirring sheets are butted at the periphery of the movable sleeve, and the outer ends of the stirring sheets extend outwards away from the movable sleeve; the stirring sheets are circumferentially arranged along the circumferential interval of the movable sleeve, stirring intervals are arranged between adjacent stirring sheets, and adjacent stirring intervals are different;
in the preparation step 1), when the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity for mixing, under the actions of upward blowing of the blowing cavity and downward blowing of the blowing cavity, the movable sleeve moves up and down back and forth along the pressure changing pipe and rotates relative to the pressure changing pipe, and the stirring blades stir and mix the light dispersing agent, the antioxidant and the dispersing agent.
Compared with the prior art ， The invention provides a preparation method of super-dispersed PC light diffusion master batch, which comprises the following steps ofThe light dispersing agent and the dispersing agent are added, a full grain extraction process is not needed, the cost is low, and the method is suitable for large-scale production; uniformly mixing the light dispersing agent, the antioxidant and the dispersing agent in a mixer to form a mixture, and then uniformly stirring the mixture and the PC resin in the mixer to form a stirring material, so that the light dispersing agent is uniformly dispersed, and the formed super-dispersed PC light dispersing master batch has better physical property parameters and product comprehensive performance, better performance and more stable impact strength and melt index parameters;
the ultra-dispersed PC light diffusion master batch and the common raw materials are uniformly stirred according to the ratio of 1:5-1:10, and when the ultra-dispersed PC light diffusion master batch is applied to an LED lampshade, bonding lines and undispersed patterns of the LED lampshade cannot appear, so that the dispersion effect is good, the effect is the same as that of a full particle drawing process, and the effect of greatly saving the cost of the full particle drawing process is achieved.
Drawings
FIG. 1 is an internal schematic view of a mixing drum provided by the present invention;
FIG. 2 is a schematic front view of a feed chamber and feed channel arrangement provided by the present invention;
fig. 3 is a schematic cross-sectional view of a mixing drum provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances.
Referring to fig. 1-3, a preferred embodiment of the present invention is provided.
The preparation method of the ultra-dispersed PC light diffusion master batch comprises the following preparation steps:
1) Providing 90-99% of PC resin, 0.05-5% of light dispersing agent, 0.01-2% of antioxidant and 0.1-3% of dispersing agent according to mass percentage; the light dispersing agent, the antioxidant and the dispersing agent are in solid particles, and the PC resin is in a fluid state;
uniformly mixing the light dispersing agent, the antioxidant and the dispersing agent in a mixer to form a mixture; the mixer is provided with a mixing cavity 101, the light dispersing agent, the antioxidant and the dispersing agent are sequentially blown into the mixing cavity 101 at high pressure, and the light dispersing agent, the antioxidant and the dispersing agent are blown into suspension by flowing gas to be mixed in the mixing cavity 101;
2) Placing the mixture and PC resin into a stirrer to be uniformly stirred to form a stirring material;
3) And placing the stirring material into a double-screw extruder for extrusion granulation to form the ultra-dispersed PC light diffusion master batch.
The preparation method of the super-dispersed PC light diffusion master batch provided by the invention has the advantages that the light diffusion agent and the dispersing agent are added, a full particle pumping process is not needed, the cost is low, and the method is suitable for large-scale production; uniformly mixing the light dispersing agent, the antioxidant and the dispersing agent in a mixer to form a mixture, and then uniformly stirring the mixture and the PC resin in the mixer to form a stirring material, so that the light dispersing agent is uniformly dispersed, and the formed super-dispersed PC light dispersing master batch has better physical property parameters and product comprehensive performance, better performance and more stable impact strength and melt index parameters; the ultra-dispersed PC light diffusion master batch and the common raw materials are uniformly stirred according to the ratio of 1:5-1:10, and when the ultra-dispersed PC light diffusion master batch is applied to an LED lampshade, bonding lines and undispersed patterns of the LED lampshade cannot appear, so that the dispersion effect is good, the effect is the same as that of a full particle drawing process, and the effect of greatly saving the cost of the full particle drawing process is achieved.
Extrusion granulation in a twin-screw extruder is a common technique at present, and will not be described in detail here.
When the super-dispersed PC light diffusion master batch prepared by the method is used for manufacturing products, the super-dispersed PC light diffusion master batch prepared by the method is mixed with general raw materials, the mixing ratio is 1:5-1:10, the quality of the products after mixing is better, and the quality of the products after mixing is equivalent to that of the products prepared by adopting a full particle drawing process at present.
As a preferred embodiment, the PC resin has a melt index of between 5MI and 80 MI. After the mixture and the PC resin are placed in a stirrer, stirring is carried out by using a stirring shaft, so that the mixture is uniformly stirred and mixed in the PC resin, and a fluid stirring material is formed.
As a preferred embodiment, the light diffusing agent is at least one of silicone and acrylic acid, and the particle size of the light diffusing agent is between 1 μm and 15 μm.
As a preferred embodiment, the dispersing agent is one or more of paraffin wax, polymer wax, aliphatic multifunctional modifier, polyol compound and fatty acid.
As a preferred embodiment, the antioxidant is a hindered phenol antioxidant or an auxiliary antioxidant.
As a preferred embodiment, the transmittance of the ultra-dispersed PC light diffusion master batch is not less than 92%.
In this embodiment, the mixer includes a mixing barrel 100, the mixing barrel 100 has the above-mentioned mixing cavity 101 therein, and the mixing cavity 101 is longitudinally arranged; three feeding chambers 500 respectively corresponding to the light diffusing agent, the antioxidant and the dispersing agent are arranged on the outer side wall of the mixing barrel 100.
The three feeding cavities 500 are circumferentially arranged at intervals along the circumferential direction of the mixing cavity 101, and the three feeding cavities 500 are arranged in a staggered manner up and down along the axial direction of the mixing cavity 101; the inner end of the feeding cavity 500 is communicated with the mixing cavity 101, and the outer end of the feeding cavity 500 is connected with the high-pressure air pipe, so that after the light dispersing agent, the antioxidant and the dispersing agent enter the mixing cavity 101 through the feeding cavity 500 respectively, the light dispersing agent, the antioxidant and the dispersing agent are arranged in a vertically staggered mode, are arranged along the circumferential direction of the mixing cavity 101, and are more convenient to be blown and mixed by gas.
The top of the mixing cavity 101 is provided with a blowing cavity 200 blowing downwards, and an upper isolation plate 201 limiting the mixture to enter the blowing cavity 200 is arranged between the blowing cavity 200 and the mixing cavity 101; the air blowing chamber 200 is communicated with the upper blower through an air pipe so that the air blowing chamber 200 is in a high pressure state, and an upper air blowing hole 202 for blowing air in the air blowing chamber 200 into the mixing chamber 101 is formed in the upper partition 201.
The bottom of the mixing cavity 101 is provided with an air blowing cavity 300 which blows air upwards, and a lower isolation plate 301 for limiting the mixture to fall into the air blowing cavity 300 is arranged between the air blowing cavity 300 and the mixing cavity 101; the air blowing cavity 300 is communicated with the lower air blowing machine through an air pipe so that the air blowing cavity 300 is in a high-pressure state, and a lower air blowing hole 302 for blowing air in the air blowing cavity 300 into the mixing cavity 101 is formed in the lower isolation plate 301; the gas pressure in the feeding chamber 500 is greater than the gas pressure in the air-blowing chamber 300 and the gas pressure in the air-blowing chamber 200, respectively, so that the light diffusing agent, the antioxidant and the dispersing agent in the feeding chamber 500 can enter the mixing chamber 101 after the air-blowing chamber 300 and the air-blowing chamber 200 blow high-pressure gas into the mixing chamber 101, respectively.
In the preparation step 1), the light dispersing agent, the antioxidant and the dispersing agent are respectively and correspondingly arranged in three feeding cavities 500, when an upper blowing machine blows air from top to bottom in the mixing cavity 101 through the blowing cavity 200, after a lower blowing machine blows air from bottom to top in the mixing cavity 101 through the blowing cavity 300, the light dispersing agent, the antioxidant and the dispersing agent are respectively blown into the mixing cavity 101 by using a high-pressure air pipe in sequence, the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity 101 and are mixed by air blowing in the mixing cavity 101.
The light dispersing agent, the antioxidant and the dispersing agent are respectively blown into the mixing cavity 101 in sequence, so that the light dispersing agent, the antioxidant and the dispersing agent entering the mixing cavity 101 are firstly dispersed in the mixing cavity 101 and then mixed, and further, the subsequent mixing is more uniform.
In this embodiment, the inner end of the feeding chamber 500 is spirally extended along the outer sidewall of the mixing tub 100, and a feeding channel 501 is formed in a strip arrangement, and the width of the feeding channel 501 is gradually reduced along the spiral direction of the feeding channel 501; the mixing tub 100 is provided therein with a plurality of feeding holes through which the light diffusing agent or the antioxidant or the dispersing agent passes into the mixing chamber 101, the feeding holes being aligned with the feeding passages 501 and being arranged at intervals along the spiral direction of the feeding passages 501, and the feeding passages 501 being communicated with the mixing chamber 101 through the feeding holes.
In the preparation step 1), when the high-pressure gas pipe injects the high-pressure gas into the feeding chamber 500, the light diffusing agent or the antioxidant or the dispersing agent in the feeding chamber 500 moves along the feeding channel 501 under the pushing of the high-pressure gas and is blown away into the mixing chamber 101 through the feeding hole.
By arranging the feeding channel 501, the light dispersing agent or the antioxidant or the dispersing agent is pushed by high-pressure gas to move along the feeding channel 501 in the feeding cavity 500, the pushing pressure can be further increased along with the width reduction of the feeding channel 501, and the light dispersing agent or the antioxidant or the dispersing agent enters the mixing cavity 101 through a plurality of feeding holes, so that the light dispersing agent or the antioxidant or the dispersing agent can be dispersed in advance, and after entering the mixing cavity 101, the light dispersing agent or the antioxidant or the dispersing agent is dispersed more uniformly in the subsequent mixing.
In this embodiment, the upper isolation plate 201 and the lower isolation plate 301 are arranged vertically opposite to each other, and a plurality of upper air blowing holes 202 are arranged around the center of the upper isolation plate 201 at intervals to form an upper air blowing ring; the lower partition plate 301 is provided with lower air holes 302, and a plurality of the lower air holes 302 form a lower air ring at the circumferential edge of the lower partition plate 301.
The diameter of the lower air-blowing ring is larger than that of the upper air-blowing ring, and the upper air-blowing ring is positioned in the surrounding area of the lower air-blowing ring along the direction opposite to the upper and lower directions; the gas pressure in the blow chamber 300 is greater than the gas pressure in the insufflation chamber 200.
Thus, when the light diffusing agent, the antioxidant and the dispersing agent enter the mixing cavity 101, the light diffusing agent, the antioxidant and the dispersing agent are blown by the high-pressure gas blown upwards by the plurality of lower air blowing holes 302, and the high-pressure gas blown downwards by the plurality of upper air blowing holes 202, the light diffusing agent, the antioxidant and the dispersing agent are mixed in a suspension state, and the light diffusing agent, the antioxidant and the dispersing agent are prevented from being blown outwards to the inner side wall of the mixing cavity 101 under the limitation of the upper air blowing ring and the lower air blowing ring.
A longitudinally arranged transformer tube 400 is arranged between the upper isolation plate 201 and the lower isolation plate 301, a plurality of ventilation holes are arranged in the side wall of the transformer tube 400, and the diameters of the ventilation holes are respectively smaller than the diameters of the light diffusion agent, the antioxidant and the dispersing agent; the bottom of the pressure changing tube 400 penetrates the air blowing cavity 300 downwards, extends to the bottom of the mixing drum 100 and is arranged in a closed mode; the top of the pressure-changing pipe 400 extends upward through the blowing chamber 200 to the top of the mixing tub 100 and communicates with the pumping air device.
In the preparation step 1), when the light diffusing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity 101 and mixed, the air sucking device alternately performs air blowing operation and air sucking operation on the transformer 400; in the process of the blowing operation, the pumping gas device blows high-pressure gas into the transformer tube 400 so as to make the transformer tube 400 in a high-pressure state; during the suction operation, the suction gas device sucks the gas in the transformer tube 400 to place the transformer tube 400 in a low-pressure state.
When the pressure changing tube 400 is in a low pressure state, suction force can be generated to the light diffusing agent, the antioxidant and the dispersing agent, the light diffusing agent, the antioxidant and the dispersing agent are sucked to move towards the pressure changing tube 400, and are mixed in the moving process; when the transformer 400 is in a high-voltage state, it drives the light diffusing agent, the antioxidant and the dispersing agent to move away from the transformer 400, and to mix during the movement.
In this way, in the transformation process of the transformer 400 at low pressure or high pressure, the light diffusing agent, the antioxidant and the dispersing agent can be mixed in a reciprocating manner in the horizontal direction, and under the blowing action of the upper blowing hole 202 and the blowing action of the lower blowing hole 302, the light diffusing agent, the antioxidant and the dispersing agent can be driven to be mixed in a reciprocating manner in the longitudinal direction, so that the whole three-dimensional space is mixed, and the mixing is more uniform.
In this embodiment, a moving sleeve 401 moving up and down along the transformer 400 is sleeved on the outer periphery of the transformer 400, and a plurality of stirring plates 402 swinging horizontally and elastically are arranged on the outer periphery of the moving sleeve 401; the inner ends of the stirring blades 402 are butted at the periphery of the movable sleeve 401, and the outer ends of the stirring blades 402 extend outwards away from the movable sleeve 401; the plurality of stirring blades 402 are circumferentially arranged along the circumferential interval of the moving sleeve 401 with stirring intervals between adjacent stirring blades 402, and adjacent stirring intervals are different, that is, adjacent stirring intervals are different.
In the preparation step 1), when the light diffusing agent, the antioxidant and the dispersing agent are suspended in the mixing chamber 101 and mixed, the movable sleeve 401 moves up and down along the transformer 400 and rotates relative to the transformer 400 under the action of upward blowing of the air blowing chamber 300 and downward blowing of the air blowing chamber 200, and the plurality of stirring blades 402 stir and mix the light diffusing agent, the antioxidant and the dispersing agent.
Since adjacent stirring intervals are different, the circumferential force and the axial force applied to the stirring blades 402 are unbalanced, so that the movable sleeve 401 can move up and down along the transformer 400 and rotate in the circumferential direction.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The preparation method of the ultra-dispersed PC light diffusion master batch is characterized by comprising the following preparation steps:
1) Providing 90-99% of PC resin, 0.05-5% of light dispersing agent, 0.01-2% of antioxidant and 0.1-3% of dispersing agent according to mass percentage; the light dispersing agent, the antioxidant and the dispersing agent are in solid particles, and the PC resin is in a fluid state;
placing the light dispersing agent, the antioxidant and the dispersing agent into a mixer for uniform mixing to form a mixture; the mixing machine is provided with a mixing cavity, the light dispersing agent, the antioxidant and the dispersing agent are sequentially blown into the mixing cavity at high pressure, and in the mixing cavity, the light dispersing agent, the antioxidant and the dispersing agent are blown into a suspension state by flowing gas to be mixed;
2) Placing the mixture and PC resin into a stirrer to be uniformly stirred to form a stirring material;
3) And placing the stirring material into a double-screw extruder for extrusion granulation to form the ultra-dispersed PC light diffusion master batch.
2. The method of preparing a super-dispersed PC light diffusion master batch as claimed in claim 1, wherein the PC resin has a melt index between 5MI and 80 MI.
3. The method for preparing the ultra-dispersed PC light-diffusing master batch according to claim 1, wherein the light-diffusing agent is at least one of silicone and acrylic acid, and the particle size of the light-diffusing agent is between 1 μm and 15 μm.
4. The method for preparing the super-dispersed PC light diffusion master batch according to claim 1, wherein the dispersing agent is one or more of paraffin wax, polymer wax, aliphatic multifunctional modifier, polyol compound, and fatty acid.
5. The method for preparing the ultra-dispersed PC light diffusion master batch according to claim 1, wherein the antioxidant is a hindered phenol antioxidant or an auxiliary antioxidant.
6. The method for preparing the ultra-dispersed PC light diffusion master batch according to claim 1, wherein the transmittance of the ultra-dispersed PC light diffusion master batch is not less than 92%.
7. The method for preparing the ultra-dispersed PC light-diffusing master batch according to any one of claims 1 to 6, wherein the mixer comprises a mixing barrel having the mixing cavity therein, the mixing cavity being arranged longitudinally; three feeding cavities which respectively and correspondingly contain a light dispersing agent, an antioxidant and a dispersing agent are arranged on the outer side wall of the mixing barrel;
the three feeding cavities are circumferentially arranged along the circumferential space of the mixing cavity, and are staggered up and down along the axial direction of the mixing cavity; the inner end of the feeding cavity is communicated with the mixing cavity, and the outer end of the feeding cavity is connected with the high-pressure air pipe;
the top of the mixing cavity is provided with a blowing cavity which blows air downwards, and an upper isolation plate which limits the mixture to enter the blowing cavity is arranged between the blowing cavity and the mixing cavity; the air blowing cavity is communicated with the upper air blowing machine through an air pipe so that the air blowing cavity is in a high-pressure state, and an upper air blowing hole for blowing air in the air blowing cavity into the mixing cavity is formed in the upper partition plate;
the bottom of the mixing cavity is provided with an air blowing cavity which blows air upwards, and a lower isolation plate which limits the mixture to fall into the air blowing cavity is arranged between the air blowing cavity and the mixing cavity; the air blowing cavity is communicated with the lower air blowing machine through an air pipe so as to be in a high-pressure state, and the lower partition plate is internally provided with a lower air blowing hole for blowing air in the air blowing cavity into the mixing cavity; the gas pressure in the feeding cavity is respectively greater than the gas pressure in the air blowing cavity and the gas pressure in the air blowing cavity;
in the preparation step 1), the light dispersing agent, the antioxidant and the dispersing agent are respectively and correspondingly arranged in three feeding cavities, when the upper blowing machine blows air from top to bottom in the mixing cavity through the air blowing cavity, the lower blowing machine blows air from bottom to top in the mixing cavity through the air blowing cavity, the light dispersing agent, the antioxidant and the dispersing agent are respectively blown into the mixing cavity by utilizing the high-pressure air pipe in sequence, and the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity and are mixed by air blowing in the mixing cavity.
8. The method for preparing ultra-dispersed PC light-diffusing master batch according to claim 7, wherein the inner end of the feed cavity extends along the outer side wall of the mixing drum in a spiral manner, a feed channel is formed in a strip arrangement, and the width of the feed channel is gradually reduced along the spiral direction of the feed channel;
a plurality of feeding holes for light dispersing agents or antioxidants or dispersing agents to pass through are formed in the mixing barrel, the feeding holes are aligned with the feeding channels and are arranged at intervals along the spiral direction of the feeding channels, and the feeding channels are communicated with the mixing cavity through the feeding holes;
in the preparation step 1), in the process of injecting high-pressure gas into the feeding cavity by the high-pressure gas pipe, the light dispersing agent or the antioxidant or the dispersing agent in the feeding cavity moves along the feeding channel under the pushing of the high-pressure gas and is blown away into the mixing cavity through the feeding hole.
9. The method for preparing the ultra-dispersed PC light diffusion master batch according to claim 7, wherein the upper isolation plate and the lower isolation plate are arranged in an up-down opposite way, and a plurality of upper air blowing holes are arranged around the center of the upper isolation plate at intervals to form an upper air blowing ring; the lower partition plate is distributed with lower air-blowing holes, and a plurality of lower air-blowing holes form a lower air-blowing ring at the circumferential edge of the lower partition plate;
the diameter of the lower air-blowing ring is larger than that of the upper air-blowing ring, and the upper air-blowing ring is positioned in the surrounding area of the lower air-blowing ring along the direction opposite to the upper direction and the lower direction; the gas pressure in the air blowing cavity is larger than the gas pressure in the air blowing cavity;
a plurality of ventilation holes are formed in the side wall of the transformer tube, and the diameters of the ventilation holes are respectively smaller than the diameters of the light diffusion agent, the antioxidant and the dispersing agent; the bottom of the pressure changing pipe downwards penetrates through the air blowing cavity, extends to the bottom of the mixing barrel and is in closed arrangement; the top of the pressure changing pipe upwards penetrates through the air blowing cavity, extends to the top of the mixing barrel and is communicated with the air sucking equipment;
in the preparation step 1), when the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity for mixing, the air sucking device alternately performs air blowing operation and air sucking operation on the pressure changing pipe; in the process of blowing operation, the suction gas device blows high-pressure gas into the pressure-changing pipe so as to enable the pressure-changing pipe to be in a high-pressure state; and in the process of carrying out the air suction operation, the air suction device sucks air in the pressure changing pipe so as to enable the pressure changing pipe to be in a low-pressure state.
10. The method for preparing the ultra-dispersed PC light diffusion master batch according to claim 9, wherein a moving sleeve which moves up and down along the transformer tube is sleeved on the periphery of the transformer tube, and a plurality of stirring sheets which elastically swing horizontally are arranged on the periphery of the moving sleeve; the inner ends of the stirring sheets are butted at the periphery of the movable sleeve, and the outer ends of the stirring sheets extend outwards away from the movable sleeve; the stirring sheets are circumferentially arranged along the circumferential interval of the movable sleeve, stirring intervals are arranged between adjacent stirring sheets, and adjacent stirring intervals are different;
in the preparation step 1), when the light dispersing agent, the antioxidant and the dispersing agent are suspended in the mixing cavity for mixing, under the actions of upward blowing of the blowing cavity and downward blowing of the blowing cavity, the movable sleeve moves up and down back and forth along the pressure changing pipe and rotates relative to the pressure changing pipe, and the stirring blades stir and mix the light dispersing agent, the antioxidant and the dispersing agent.
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