Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a color master batch for a white photovoltaic packaging adhesive film and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a color master batch for a white photovoltaic packaging adhesive film, which comprises the following components in parts by weight:
according to the invention, the dispersing agent can effectively improve the dispersibility of titanium dioxide in the color master batch extrusion processing process, inhibit the agglomeration and bridging of the titanium dioxide, reduce die head accumulation in the extrusion casting process of the white photovoltaic packaging adhesive film, reduce adhesive film agglomeration, reduce the joint rate, reduce defective products and improve the production efficiency. The silicone master batch taking EVA as a carrier has good compatibility with an EVA resin base material, good stability and non-migration property, and can reduce the extrusion torque, improve the fluidity of resin, improve the extrusion rate of the white photovoltaic packaging adhesive film and improve the production efficiency; the silicone master batch can also reduce equipment friction, improve resin demoulding performance, eliminate plastic melt fracture, reduce die head accumulation and reduce adhesive film agglomeration.
According to the invention, the silicone master batch and the dispersing agent are cooperatively matched at a specific ratio, so that the master batch capable of effectively reducing white photovoltaic packaging adhesive film agglomeration and improving the adhesive film yield is obtained.
In the present invention, the EVA resin may be 40 to 60 parts by weight, for example, 40 parts, 42 parts, 43 parts, 45 parts, 46 parts, 48 parts, 50 parts, 52 parts, 53 parts, 55 parts, 56 parts, 58 parts, or 60 parts.
In the invention, the weight portion of the titanium dioxide is 40-60 portions, such as 40 portions, 42 portions, 43 portions, 45 portions, 46 portions, 48 portions, 50 portions, 52 portions, 53 portions, 55 portions, 56 portions, 58 portions or 60 portions.
In the present invention, the silicone base particle may be 1 to 5 parts by weight, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, or 5 parts.
In the present invention, the dispersant may be used in an amount of 1 to 5 parts by weight, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts, 3.5 parts, 4 parts, 4.5 parts, 5 parts, or the like.
In the invention, if the dosage of the silicone master batch or the dispersing agent is too small, the dispersibility of the titanium dioxide is improved, and the effect of reducing adhesive film agglomeration is not obvious; if the using amount of the silicone master batch is too much, the volume resistivity of the photovoltaic packaging adhesive film is obviously reduced; if the amount of the dispersant is too large, the yellowing resistance and the volume resistivity of the photovoltaic packaging adhesive film are obviously reduced.
As a preferred technical scheme of the invention, the melt flow rate of the EVA resin is 20-30g/10 min; for example, it may be 20g/10min, 21g/10min, 22g/10min, 23g/10min, 24g/10min, 25g/10min, 26g/10min, 27g/10min, 28g/10min, 29g/10min, or 30g/10 min.
The melt flow rate in the present invention means a melt flow rate measured at a temperature of 190 ℃ and a pressure of 2.16 kg.
Preferably, the EVA resin has a VA (vinyl acetate unit) content of 20 to 30 wt%; for example, it may be 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, or the like.
In the invention, the EVA resin with high melt index and high VA content is preferably selected as the EVA resin, which is beneficial to further improving the dispersibility of titanium dioxide in the extrusion processing process of color master batches and reducing the caking phenomenon of a photovoltaic packaging adhesive film.
As the preferred technical scheme of the invention, the average particle size of the titanium dioxide is 150-400 nm; for example, it may be 150nm, 200nm, 250nm, 300nm, 350nm, 400nm, or the like.
As a preferred technical scheme of the invention, the carrier of the silicone master batch is EVA resin, and the silicone content is more than or equal to 50 wt%; for example, it may be 50 wt%, 52 wt%, 55 wt%, 58 wt%, 60 wt%, 62 wt%, 65 wt%, 68 wt%, 70 wt%, or the like.
The silicone master batch taking the EVA resin as the carrier has good compatibility with the EVA matrix of the master batch, and is beneficial to further improving the dispersibility of the titanium pigment; the selection of high silicone content is favorable for improving the effects of the silicone master batch on reducing extrusion torque, equipment friction and adhesive film agglomeration
As a preferred technical scheme of the invention, the dispersing agent is polyethylene wax and/or oxidized polyethylene wax.
Preferably, the mass ratio of the silicone master batch to the dispersing agent is 1:3-1.5: 1; for example, 1:3, 1:2.5, 1:2, 1:1.5, 1:1, 1.2:1, or 1.5:1, etc.
As a preferable technical scheme of the present invention, the color master batch further comprises 0.1-0.5 part (for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part or 0.5 part) of an antioxidant.
Preferably, the antioxidant is selected from one or a combination of at least two of pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], N-octadecyl beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate, N '-bis- [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl ] hexanediamine, 2, 6-di-tert-butyl-p-cresol, 4' -thiobis (3-methyl-6-tert-butylphenol), dilaurate thiodipropionate and tris (2, 4-di-tert-butylphenyl) phosphite.
As a preferable embodiment of the present invention, the color masterbatch is cylindrical particles, and the length of the color masterbatch is 2.8mm ± 0.5mm, for example, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, or 3.3 mm; the diameter is 2.5 mm. + -. 0.5mm, and may be, for example, 2.0mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3.0 mm.
Preferably, the continuous grain rate of the color master batch is less than or equal to 0.2 percent, and the water content is less than or equal to 0.1 percent by weight.
In a second aspect, the present invention provides a preparation method of the color master batch, including the following steps:
(1) mixing the components except the titanium dioxide according to the proportion;
(2) and (2) extruding the mixed material obtained in the step (1) and titanium dioxide by using an extruder, and pelletizing to obtain the color master batch.
As a preferred embodiment of the present invention, the mixing in step (1) is carried out in a high-speed mixer.
Preferably, the rotation speed of the high-speed mixer is 500-1000r/min, such as 500r/min, 550r/min, 600r/min, 650r/min, 700r/min, 750r/min, 800r/min, 850r/min, 900r/min, 950r/min or 1000 r/min; the mixing time is 5-10min, such as 5.5min, 6min, 6.5min, 7min, 7.5min, 8min, 8.5min, 9min, 9.5min or 10 min.
As a preferred technical scheme of the invention, the mixed material and the titanium dioxide in the step (2) are continuously added into an extruder according to the proportion by two weightless scales.
The method comprises the steps of mixing other components except the titanium dioxide, and then respectively and quantitatively and continuously adding the mixed material and the titanium dioxide into an extruder according to the proportion by adopting two weightless scales, so that the problem that the titanium dioxide is easy to agglomerate due to pressure generated by mixing by adopting a high-speed mixer is avoided, the problem of layering of the titanium dioxide and other materials due to different densities is avoided by accurately, quantitatively and continuously feeding, and the dispersibility of the titanium dioxide in the extrusion processing of the master batch is further improved, so that the agglomeration phenomenon of the photovoltaic packaging adhesive film is further reduced.
Preferably, the extruder in step (2) is a twin-screw extruder.
Preferably, the temperature of the extrusion in step (2) is 80-140 ℃.
The extruder is heated in a sectional mode, the heating set temperature of each section is different, and the temperature of the melt extrusion in the invention refers to the temperature range of the whole extruder.
Preferably, the pelletizing in step (2) is carried out in water.
Preferably, the drying operation is also performed after the dicing in step (2).
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, by adopting the silicone master batch and the dispersing agent to be cooperatively matched in a specific proportion, the dispersion uniformity of the titanium dioxide in the master batch is improved, the agglomeration and bridging of the titanium dioxide are inhibited, the dispersion grade of the prepared master batch is 1-3.5, the filter pressing value is 0.8-3.6bar/g, the extrusion torque can be effectively reduced, the die head accumulation in the extrusion casting process of the white photovoltaic packaging adhesive film is reduced, the adhesive film agglomeration is reduced, and the production efficiency is improved.
In the preparation method, other components except the titanium dioxide are mixed firstly, and then the mixed material and the titanium dioxide are respectively and quantitatively and continuously added into the extruder according to the proportion by adopting two weightless scales, so that the problem that the titanium dioxide is easy to agglomerate due to the pressure generated by mixing by adopting a high-speed mixer is avoided, the problem of layering caused by different densities of the titanium dioxide and other materials is avoided, and the agglomeration phenomenon of the photovoltaic packaging adhesive film is further reduced.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific examples. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
The raw materials adopted in the embodiment of the invention are as follows:
EVA resin: hanhua E282PV (melt index 25g/10min, VA content 28%), Taiwan polymeric UE2825 (melt index 25g/10min, VA content 28%), Sponger UE2825 (melt index 25g/10min, VA content 28%), Singapore polyolefin VF024N00 (melt index 28g/10min, VA content 28%);
titanium dioxide: keveil R-706 (median particle size of 360nm), Cinza CR210 (average particle size of 200nm), Trinito 8400 (average particle size of 230nm), and TiONA288 (average particle size of 250 nm);
silicone master batch: dow Corning MB50-320 (silicone content is more than or equal to 50%), Shanghai Kangyan chemical company, ME-803 (silicone content is more than or equal to 50%), Zhongshan Honglijianpan trade company, HL-58 (silicone content is more than or equal to 65%), Shanghai Yinghe chemical company, MB50-B003 (silicone content is more than or equal to 50%).
Example 1
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which comprises the following components in parts by weight:
the preparation method of the color master batch comprises the following steps:
(1) adding the components except the titanium dioxide into a high-speed mixer according to the proportion, and mixing for 10min at the rotating speed of 500 r/min;
(2) and (2) quantitatively and continuously adding the mixed material obtained in the step (1) and titanium dioxide into a double-screw extruder by using two weightless scales according to a ratio, extruding at 80-140 ℃, and carrying out underwater granulation, spin-drying and hot air drying to obtain the color master batch.
Example 2
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which comprises the following components in parts by weight:
the preparation method of the color master batch comprises the following steps:
(1) adding the components except the titanium dioxide into a high-speed mixer according to the proportion, and mixing for 5min at the rotating speed of 1000 r/min;
(2) and (2) quantitatively and continuously adding the mixed material obtained in the step (1) and titanium dioxide into a double-screw extruder by using two weightless scales according to a ratio, extruding at 80-140 ℃, and carrying out underwater granulation, spin-drying and hot air drying to obtain the color master batch.
Example 3
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which comprises the following components in parts by weight:
the preparation method of the color master batch comprises the following steps:
(1) adding the components except the titanium dioxide into a high-speed mixer according to the proportion, and mixing for 8min at the rotating speed of 800 r/min;
(2) and (2) quantitatively and continuously adding the mixed material obtained in the step (1) and titanium dioxide into a double-screw extruder by using two weightless scales according to a ratio, extruding at 80-140 ℃, and carrying out underwater granulation, spin-drying and hot air drying to obtain the color master batch.
Example 4
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which comprises the following components in parts by weight:
the preparation method of the color master batch comprises the following steps:
(1) adding the components except the titanium dioxide into a high-speed mixer according to the proportion, and mixing for 8min at the rotating speed of 800 r/min;
(2) and (2) quantitatively and continuously adding the mixed material obtained in the step (1) and titanium dioxide into a double-screw extruder by using two weightless scales according to a ratio, extruding at 80-140 ℃, and carrying out underwater granulation, spin-drying and hot air drying to obtain the color master batch.
Example 5
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which comprises the following components in parts by weight:
the procedure for the preparation of the color masterbatch in this example was the same as in example 1.
Example 6
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of the silicone master batch is 1 part, the weight part of the dispersing agent is 5 parts, and other components, the using amounts and the preparation steps are the same as those of the embodiment 1.
Example 7
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of the silicone master batch is 2 parts, the weight part of the dispersing agent is 4 parts, and other components, the using amount and the preparation steps are the same as those of the embodiment 1.
Example 8
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of the silicone master batch is 4 parts, the weight part of the dispersing agent is 2 parts, and other components, the using amount and the preparation steps are the same as those of the embodiment 1.
Example 9
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of the silicone master batch is 5 parts, the weight part of the dispersing agent is 1 part, and other components, the using amount and the preparation steps are the same as those of the embodiment 1.
Example 10
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of EVA resin is 45 parts, and the weight part of titanium dioxide is 55 parts; other components, amounts and preparation steps were the same as in example 1.
Example 11
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that 50 parts by weight of EVA resin and 50 parts by weight of titanium dioxide are used; other components, amounts and preparation steps were the same as in example 1.
Example 12
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of EVA resin is 55 parts, and the weight part of titanium dioxide is 45 parts; other components, amounts and preparation steps were the same as in example 1.
Example 13
The embodiment provides a color master batch for a white photovoltaic packaging adhesive film, which is different from the embodiment 1 in that the weight part of EVA resin is 60 parts, and the weight part of titanium dioxide is 40 parts; other components, amounts and preparation steps were the same as in example 1.
Comparative example 1
This example provides a color concentrate, which differs from example 1 in that it does not contain silicone concentrate and dispersant, and the other components, amounts, and preparation steps are the same as example 1.
Comparative example 2
This example provides a color masterbatch, which is different from example 1 in that it does not contain silicone masterbatch, the weight part of dispersant is 6 parts, and other components, amounts and preparation steps are the same as example 1.
Comparative example 3
This example provides a color masterbatch, which is different from example 1 in that no dispersant is contained, the weight part of silicone masterbatch is 6 parts, and other components, amounts and preparation steps are the same as those of example 1.
And (3) performance testing:
the performance of the color concentrates provided in examples 1-13 and comparative examples 1-3 above was tested as follows:
(1) and (3) testing the dispersion grade: and (3) performing sample preparation test according to the specification of the standard GB/T18251-2000, observing the dispersion state of the color master batch by using a magnifier with the magnification of 10 multiplied by 10 times, wherein the dispersion grade is 0-7 grade, the 0 grade represents the highest dispersion grade, and then sequentially decreasing, and the higher the dispersion grade, the better the dispersion.
(2) And (3) testing the filter pressing value: and (3) performing sample preparation test according to the specification of the standard BS EN13900-5:2005, wherein the smaller the filter pressing value is, the better the dispersibility of the titanium dioxide in the color master batch is.
(3) Testing the caking quantity: adding the prepared different color masterbatches into the same white EVA adhesive film formula (100 parts of EVA resin (the total amount of the EVA resin in the color masterbatches and the added EVA resin in addition, the added EVA resin is Hanhua E282PV), 8 parts of titanium dioxide (the amount of the color masterbatches is added according to the corresponding amount of the amount and the content of the titanium dioxide), 0.5 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.7 part of triacrylate, 0.7 part of propoxylated glycerol triacrylate, 0.25 part of bis (1,2,2,6, 6-pentamethyl-4-piperidyl) sebacate and 0.5 part of gamma-methacryloxypropyltrimethoxysilane), mixing and stirring for 2.5h at the stirring speed of 20r/min, mixing the materials in the same extrusion casting equipment under the same process production conditions (the extrusion temperature is 50-100 ℃, the casting line speed is 8m/min, and the gram weight is 470g/m2) The number of lumps generated by the continuous production of 24h white EVA film was tested.
The results of the above tests are shown in table 1 below:
TABLE 1
Test items
|
Grade of dispersion
|
Pressure filtration value (bar/g)
|
Number of lumps formed in 24h
|
Example 1
|
2.5
|
2.4
|
5
|
Example 2
|
3.0
|
3.1
|
6
|
Example 3
|
1.5
|
1.1
|
3
|
Example 4
|
1
|
0.8
|
2
|
Example 5
|
2
|
1.8
|
3
|
Example 6
|
3.0
|
2.9
|
6
|
Example 7
|
2.5
|
2.3
|
5
|
Example 8
|
3.5
|
3.4
|
7
|
Example 9
|
3.5
|
3.6
|
7
|
Practice ofExample 10
|
2.5
|
2.0
|
4
|
Example 11
|
2
|
1.5
|
3
|
Example 12
|
1.5
|
1.2
|
3
|
Example 13
|
1
|
1
|
2
|
Comparative example 1
|
4.5
|
7.6
|
15
|
Comparative example 2
|
3.5
|
3.9
|
8
|
Comparative example 3
|
4.0
|
5.3
|
10 |
As can be seen from the test results in Table 1, the dispersion grade of the color master batch provided by the invention is 1-3.5, the filter pressing value is 0.8-3.6bar/g, and the titanium dioxide powder is well dispersed; compared with the color master batch (comparative example 1) without the silicone master batch and the dispersing agent, the white EVA adhesive film prepared by the color master batch provided by the invention has the advantage that the caking number in 24h of continuous production is obviously reduced.
Compared with the embodiment 1, the ratio of the consumption of the silicone master batch to the consumption of the dispersing agent in the embodiment 6 is smaller, the ratio of the consumption of the silicone master batch to the consumption of the dispersing agent in the embodiments 8 and 9 is larger, and the dispersibility of the titanium dioxide of the obtained color master batch is inferior to that of the titanium dioxide in the embodiment 1.
Compared with the embodiment 1, the silicone master batch is replaced by the same amount of the dispersing agent in the comparative example 2, the dispersing agent is replaced by the same amount of the silicone master batch in the comparative example 3, the dispersing grade and the filter pressing value of the master batches prepared by the silicone master batch and the dispersing agent are both obviously reduced, and the agglomeration phenomenon is obviously increased when the white EVA adhesive film is prepared by the master batches, so that the silicone master batch and the dispersing agent have the effects of synergistically improving the dispersibility of the titanium dioxide and reducing the agglomeration of the adhesive film.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.