CN112812414B - Fluorosilicone polymer processing aid master batch and preparation method thereof - Google Patents

Fluorosilicone polymer processing aid master batch and preparation method thereof Download PDF

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CN112812414B
CN112812414B CN202011632091.2A CN202011632091A CN112812414B CN 112812414 B CN112812414 B CN 112812414B CN 202011632091 A CN202011632091 A CN 202011632091A CN 112812414 B CN112812414 B CN 112812414B
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antioxidant
processing aid
fluorine
polymer
master batch
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CN112812414A (en
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徐力群
义贤富
任杰
陈双彬
金林
夏杜燕
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Zhejiang Java Specialty Chemicals Co ltd
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Abstract

The invention discloses a fluorosilicone polymer processing aid master batch which comprises the following components in percentage by mass: 40-60% of polymer resin, 20-40% of silicon rubber, 0.2-2% of antioxidant, 5-25% of fluorine-containing polymer and 0.01-0.1% of initiator. The invention also discloses a preparation method of the fluorosilicone polymer processing aid master batch. Compared with the prior art, the master batch of the fluorosilicone polymer processing aid has the advantages of quick response, good yellowing resistance, effective improvement of the appearance and performance of a product during processing of a polyolefin product, and the like.

Description

Fluorosilicone polymer processing aid master batch and preparation method thereof
Technical Field
The invention relates to the technical field of high polymer materials, and particularly relates to a fluorosilicone polymer processing aid master batch and a preparation method thereof.
Background
Either defective appearance or frequent shut-down to remove die coke during polyolefin extrusion processing is unacceptable and fluoropolymer processing aid PPA can solve these problems, but the effect of the PPA is to form a stable lubricating layer between the cavity inside the extruder, the die surface and the polymer melt. Whereas for conventional fluoropolymer processing aid PPA, the formation of this stable lubricating layer takes at least about 1 hour, which is generally referred to as the onset time, the quality of the article produced prior to the formation of this stable lubricating layer is subject to defects. Meanwhile, the PPA which is the conventional common fluoropolymer processing aid is basically obtained by compounding polyethylene glycol and a fluoroelastomer, the low-molecular-weight polyethylene glycol has poor heat resistance and is easy to oxidize and decompose, and a coking phenomenon is easy to occur at a die head in a long-time extrusion processing process.
Therefore, how to find a new processing aid to solve the problems of long acting time, poor yellowing resistance and poor mechanical property of the PPA which is the current fluoropolymer processing aid becomes the key for preparing high-performance plastic products.
Disclosure of Invention
One of the technical problems to be solved by the invention is as follows: aiming at the defects in the prior art, the fluorine-containing polymer processing aid master batch is provided, the fluorine-containing polymer and rubber are subjected to grafting reaction to carry out synergistic modification on a polymer resin matrix, the adopted fluorine-containing polymer not only has a smooth macromolecular chain and excellent processing performance, but also has good yellowing resistance, quick response and good mechanical property.
The second technical problem to be solved by the invention is to provide a preparation method of the fluorine-silicon polymer processing aid master batch, which is characterized in that the fluorine-containing polymer is pretreated at a certain temperature before processing to volatilize moisture and low molecular weight components in the fluorine-containing polymer, so that the yellowing resistance of the master batch is effectively improved, and the method is simple to operate and has low requirement on equipment.
In order to solve the first technical problem, the invention adopts the technical scheme that:
a master batch of a fluorosilicone polymer processing aid comprises the following components in percentage by mass:
40 to 60 percent of polymer resin,
20 to 40 percent of silicon rubber,
0.2 to 2 percent of antioxidant,
5 to 25 percent of fluorine-containing polymer,
0.01 to 0.1 percent of initiator.
Preferably, the polymer resin is one of EVA, LLDPE, LDPE, HDPE, ULDPE, XHDPE, XLLDPE and PP.
Preferably, the polymer resin has a melt index of (1 to 10) g/10 min.
Preferably, the antioxidant is one or a mixture of several of antioxidant 1010, antioxidant 1076, antioxidant 215, antioxidant 168, antioxidant 300, antioxidant 626, antioxidant 1098 and antioxidant 3114.
Preferably, in the above aspect, the fluoropolymer is a copolymer of caprolactone, a fluoroelastomer and an interfacial dispersant; the copolymer is a copolymer with a mass ratio of caprolactone to fluoroelastomer to interfacial dispersant being 6:3: 1.
Preferably, in the above aspect, the fluoropolymer is a copolymer of caprolactone, a fluoroelastomer and an interfacial dispersant; the interface dispersant is one or a mixture of talcum powder, diatomite, calcium carbonate and silicon dioxide.
Preferably, the fluorine-containing elastomer is one or more of a copolymer of vinylidene fluoride and hexafluoropropylene, a terpolymer of vinylidene fluoride, hexafluoropropylene and tetrafluoroethylene, and a terpolymer of tetrafluoroethylene, vinylidene fluoride and propylene.
Preferably, the fluoropolymer has a molecular weight of 1000-100000.
Preferably, the silicone rubber is dimethyl silicone rubber, methyl vinyl silicone rubber, methyl phenyl vinyl silicone rubber, and the molecular weight of the silicone rubber is 200000-2000000.
Preferably, the initiator is dicumyl peroxide.
In order to solve the second technical problem, the technical scheme adopted by the invention is as follows:
a preparation method of a fluorosilicone polymer processing aid master batch comprises the following steps:
(1) weighing polymer resin, silicon rubber, an antioxidant, a fluorine-containing polymer and an initiator according to the mass percentage, and pretreating the fluorine-containing polymer in an oven for 30-60 min;
(2) mixing polymer resin, silicon rubber, fluorine-containing polymer and antioxidant in a high-speed mixer or an internal mixer for 1-10min, adding an initiator, and mixing for 5-10min to obtain a mixed material;
(3) and (3) putting the mixed material prepared in the step (2) into a double-screw extruder for melt extrusion granulation to prepare the processing aid master batch for the fluorosilicone polymer.
As the optimization of the technical scheme, the length-diameter ratio of the double-screw extruder is 40:1-52: 1; the conditions during the extrusion granulation are as follows: the temperatures in the various stages were as follows: the feeding section is 40-60 ℃, the conveying section is 120-170 ℃, the melting section is 170-200 ℃, the head is 170-200 ℃, the residence time in the whole extrusion process is 1-3min, the die head pressure is 4-14MPa, the tail end of the extruder is vacuumized and exhausted, and the exhaust vacuum degree is-0.08 MPa to-0.1 MPa.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention uses dicumyl peroxide as initiator to graft fluorine-containing polymer and silicon rubber in a double screw extruder to form fluorine-silicon macromolecular chain. In the extrusion processing process of polyolefin, by means of the flexibility of the fluorine-silicon macromolecular chain, a continuous lubricating coating can be quickly formed, and the problem of slow response time in the extrusion process is well solved.
Compared with the existing fluorine-containing polymer processing aid, the fluorine-silicon polymer processing aid prepared by the invention has excellent yellowing resistance. The invention pretreats the fluorine-containing polymer in the oven, and volatilizes components such as water, low molecules and the like, so that the yellowing resistance of the processing aid master batch is obviously improved compared with the prior fluorine-containing polymer processing aid.
Detailed Description
The invention is further illustrated by the following examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1
(1) Weighing 10101 kg of antioxidant, 1681 kg of antioxidant, 23kg of methyl vinyl silicone rubber, 60kg of LLDPE (melt index is 1g/10min,190 ℃), 15kg of fluorine-containing polymer and 0.01kg of dicumyl peroxide by mass, and pretreating the fluorine-containing polymer in an oven at 150 ℃ for 30 min;
(2) putting the weighed LLDPE, the methyl vinyl silicone rubber, the fluorine-containing polymer, the antioxidant 1010 and the antioxidant 168 into a high-speed stirrer in sequence, and stirring for 3min at the stirring speed of 50 rpm;
(3) opening a sealing cover of the high-speed stirrer, adding dicumyl peroxide, and continuously stirring for 8min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 40:1, adding the mixed material prepared in the step (3) into the double-screw extruder, setting the temperature of a feeding section to be 60 ℃, the temperature of a conveying section to be 150 ℃, the temperature of a melting section to be 185 ℃, the temperature of a machine head to be 185 ℃, the rotating speed of a screw to be 265rpm, the pressure of a die head to be 10MPa, vacuumizing the tail end of the extruder, and controlling the vacuum degree to be-0.08 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-1.
Example 2
(1) Weighing 10100.5 kg of antioxidant, 1681.5 kg of antioxidant, 38kg of methyl vinyl silicone rubber, 40kg of LLDPE (melt index of 1g/10min,190 ℃), 20kg of fluorine-containing polymer and 0.01kg of dicumyl peroxide by mass, and pretreating the fluorine-containing polymer in an oven at 160 ℃ for 60 min;
(2) putting the weighed LLDPE, methyl vinyl silicone rubber, fluoropolymer, antioxidant 1010 and antioxidant 168 into a high-speed stirrer in sequence, and stirring for 4min at a stirring speed of 50 rpm;
(3) opening a sealing cover of the high-speed stirrer, adding dicumyl peroxide, and continuously stirring for 10min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 52:1, adding the prepared mixed material into the double-screw extruder, setting the temperature of a feeding section to be 55 ℃, the temperature of a conveying section to be 145 ℃, the temperature of a melting section to be 180 ℃, the temperature of a machine head to be 180 ℃, the rotating speed of a screw to be 300rpm, the pressure of a die head to be 10MPa, vacuumizing the tail end of the extruder, and controlling the vacuum degree to be-0.1 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-2.
Example 3
(1) 10760.5 kg of antioxidant, 1680.5 kg of antioxidant, 31140.5 kg of antioxidant, 36kg of methyl vinyl silicone rubber, 47.5kg of LLDPE (melt index is 5g/10min,190 ℃), 15kg of fluorine-containing polymer and 0.01kg of dicumyl peroxide are weighed by mass, and the fluorine-containing polymer is pretreated for 40min at 165 ℃ in an oven;
(2) the LLDPE, the methyl vinyl silicone rubber, the fluorine-containing polymer, the antioxidant 1076, the antioxidant 168 and the antioxidant 3114 weighed above are sequentially put into an internal mixer for internal mixing for 4min at the temperature of 60 ℃, and the speed of the internal mixer is 50 rpm;
(3) opening a sealing cover of the internal mixer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 50:1, adding the prepared mixed material into the double-screw extruder, setting the temperature of a feeding section to be 50 ℃, the temperature of a conveying section to be 145 ℃, the temperature of a melting section to be 185 ℃, the temperature of a machine head to be 185 ℃, the rotating speed of a screw to be 250rpm, the pressure of a die head to be 8MPa, vacuumizing the tail end of the extruder, and vacuumizing the vacuum degree to be-0.08 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-3.
Example 4
(1) 10760.5 kg of antioxidant, 1681.0 kg of antioxidant, 38kg of methyl vinyl silicone rubber, 40kg of LDPE (melt index is 1g/10min at 190 ℃), 20.5kg of fluorine-containing polymer and 0.01kg of dicumyl peroxide are weighed by mass, and the fluorine-containing polymer is pretreated for 30min at 155 ℃ in an oven;
(2) the weighed LDPE, the methyl vinyl silicone rubber, the fluoropolymer, the antioxidant 1076 and the antioxidant 168 are sequentially put into an internal mixer for internal mixing for 5min at the temperature of 60 ℃, and the speed of the internal mixer is 50 rpm;
(3) opening a sealing cover of the internal mixer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material into the double-screw extruder, setting the temperature of a feeding section to be 50 ℃, the temperature of a conveying section to be 145 ℃, the temperature of a melting section to be 190 ℃, the temperature of a machine head to be 190 ℃, the rotating speed of a screw to be 250rpm, the pressure of a die head to be 8MPa, vacuumizing the tail end of the extruder, and keeping the vacuum degree to be-0.1 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-4.
Example 5
(1) Weighing 10761.0 kg of antioxidant, 6180.5 kg of antioxidant, 10980.5 kg of antioxidant, 25kg of methyl vinyl silicone rubber, 48kg of LDPE (melt index is 3g/10min at 190 ℃), 25kg of fluoropolymer and 0.02kg of dicumyl peroxide by mass, and pretreating the fluoropolymer in an oven at 155 ℃ for 45 min;
(2) sequentially putting the weighed LDPE, the methyl vinyl silicone rubber, the fluorine-containing polymer, the antioxidant 1076, the antioxidant 618 and the antioxidant 1098 into an internal mixer for internal mixing at the temperature of 55 ℃ for 7min and at the speed of 50 rpm;
(3) opening a sealing cover of the internal mixer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material into the double-screw extruder, setting the feeding section temperature to be 55 ℃, the conveying section temperature to be 155 ℃, the melting section temperature to be 200 ℃, the head temperature to be 200 ℃, the screw rotating speed to be 300rpm, the die head pressure to be 8MPa, vacuumizing the tail end of the extruder, and controlling the vacuum degree to be-0.1 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-5.
Example 6
(1) 2150.5 kg of antioxidant, 1680.5 kg of antioxidant, 10980.5 kg of antioxidant, 23.5kg of methyl vinyl silicone rubber, 55kg of LLDPE (melt index is 8g/10min,190 ℃), 20kg of fluorine-containing polymer and 0.02kg of dicumyl peroxide are weighed by mass, and the fluorine-containing polymer is pretreated for 45min at 155 ℃ in an oven;
(2) putting the weighed LLDPE, methyl vinyl silicone rubber, fluorine-containing polymer, antioxidant 3114, antioxidant 168 and antioxidant 1098 into a high-speed stirrer in sequence, and stirring for 4min at the stirring speed of 40 rpm;
(3) opening a sealing cover of the high-speed stirrer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material, setting the temperature of a feeding section to be 55 ℃, the temperature of a conveying section to be 145 ℃, the temperature of a melting section to be 190 ℃, the temperature of a machine head to be 200 ℃, the rotating speed of a screw to be 200rpm, the pressure of a die head to be 12MPa, vacuumizing the tail end of the extruder, and setting the vacuum degree to be-0.1 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-6.
Example 7
(1) 10100.5 kg of antioxidant, 6180.5 kg of antioxidant, 31140.5 kg of antioxidant, 27.5kg of methyl vinyl silicone rubber, 56kg of LLDPE (melt index is 10g/10min,190 ℃), 15kg of fluorine-containing polymer and 0.05kg of dicumyl peroxide are weighed by mass, and the fluorine-containing polymer is pretreated for 50min at 160 ℃ in an oven;
(2) putting the weighed LLDPE, methyl vinyl silicone rubber, fluorine-containing polymer, antioxidant 1010, antioxidant 618 and antioxidant 3114 into a high-speed stirrer in sequence, and stirring for 4min at the stirring speed of 40 rpm;
(3) opening a sealing cover of the high-speed stirrer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material, setting the temperature of a feeding section to be 50 ℃, the temperature of a conveying section to be 155 ℃, the temperature of a melting section to be 200 ℃, the temperature of a machine head to be 200 ℃, the rotating speed of a screw to be 300rpm, the pressure of a die head to be 14MPa, vacuumizing the tail end of the extruder, and setting the vacuum degree to be-0.09 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-7.
Example 8
(1) 10761.0 kg of antioxidant, 1680.5 kg of antioxidant, 30kg of dimethyl silicon rubber, 48.5kg of PP (melt index is 10g/10min,190 ℃), 20kg of fluoropolymer and 0.05kg of dicumyl peroxide are weighed by mass, and the fluoropolymer is pretreated for 50min in an oven at 160 ℃;
(2) sequentially putting the weighed PP, dimethyl silicone rubber, fluorine-containing polymer, antioxidant 1076 and antioxidant 168 into a high-speed stirrer to be stirred for 4min at the stirring speed of 40 rpm;
(3) opening a sealing cover of the high-speed stirrer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material, setting the temperature of a feeding section to be 60 ℃, the temperature of a conveying section to be 160 ℃, the temperature of a melting section to be 190 ℃, the temperature of a machine head to be 190 ℃, the rotating speed of a screw to be 350rpm, the pressure of a die head to be 6MPa, vacuumizing the tail end of the extruder, and setting the vacuum degree to be-0.09 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-8.
Example 9
(1) 10100.5 kg of antioxidant, 1680.5 kg of antioxidant, 30kg of dimethyl silicon rubber, 44kg of XHDPE, 25kg of fluoropolymer and 0.05kg of dicumyl peroxide are weighed by mass, and the fluoropolymer is pretreated for 45min at the temperature of 155 ℃ in an oven;
(2) sequentially putting the weighed XHDPE, the dimethyl silicon rubber, the fluoropolymer, the antioxidant 1010 and the antioxidant 168 into a high-speed stirrer to be stirred for 4min at the stirring speed of 40 rpm;
(3) opening a sealing cover of the high-speed stirrer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material, setting the temperature of a feeding section to be 60 ℃, the temperature of a conveying section to be 160 ℃, the temperature of a melting section to be 190 ℃, the temperature of a machine head to be 190 ℃, the rotating speed of a screw to be 350rpm, the pressure of a die head to be 8MPa, vacuumizing the tail end of the extruder, and setting the vacuum degree to be-0.09 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-9.
Example 10
(1) 10101.0 kg of antioxidant, 1680.5 kg of antioxidant, 28.5kg of methyl phenyl vinyl silicone rubber, 60kg of XHDPE, 10kg of fluorine-containing polymer and 0.08kg of dicumyl peroxide are weighed by mass, and the fluorine-containing polymer is pretreated for 45min at the temperature of 155 ℃ in an oven;
(2) sequentially placing the weighed XHDPE, the methyl phenyl vinyl silicone rubber, the fluoropolymer, the antioxidant 1010 and the antioxidant 168 into an internal mixer for internal mixing at the temperature of 55 ℃ for 7min, wherein the speed of the internal mixer is 40 rpm;
(3) opening a sealing cover of the internal mixer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material, setting the temperature of a feeding section to be 60 ℃, the temperature of a conveying section to be 160 ℃, the temperature of a melting section to be 190 ℃, the temperature of a machine head to be 190 ℃, the rotating speed of a screw to be 350rpm, the pressure of a die head to be 10MPa, vacuumizing the tail end of the extruder, and setting the vacuum degree to be-0.09 MPa;
(5) after the preparation, extruding and granulating to obtain the master batch-10.
Example 11
(1) 10101.0 kg of antioxidant, 1680.5 kg of antioxidant, 35.5kg of methyl phenyl vinyl silicone rubber, 58kg of EVA, 5kg of fluoropolymer and 0.1kg of dicumyl peroxide are weighed by mass, and the fluoropolymer is pretreated for 65min at the temperature of 155 ℃ in an oven;
(2) sequentially placing the weighed EVA, methyl phenyl vinyl silicone rubber, fluoropolymer, antioxidant 1010 and antioxidant 168 into an internal mixer for internal mixing at the temperature of 55 ℃ for 10min, wherein the speed of the internal mixer is 40 rpm;
(3) opening a sealing cover of the internal mixer, adding dicumyl peroxide, and continuously stirring for 5min to obtain a mixed material;
(4) selecting a double-screw extruder with the length-diameter ratio of 42:1, adding the prepared mixed material, setting the temperature of a feeding section to be 60 ℃, the temperature of a conveying section to be 160 ℃, the temperature of a melting section to be 190 ℃, the temperature of a machine head to be 190 ℃, the rotating speed of a screw to be 350rpm, the pressure of a die head to be 6MPa, vacuumizing the tail end of the extruder, and setting the vacuum degree to be-0.1 MPa;
(5) after the preparation, extrusion granulation is carried out to obtain the master batch-11.
The application example is as follows:
the master batches obtained in examples 1 to 11 were applied to a polyethylene film system, and the formulation of the master batch was as shown in Table 1, using polyethylene LLDPE 1001AV (supplied by Exxon Mobil chemical industry, USA).
TABLE 1
Figure GDA0003214643410000091
Mixing the polyethylene, the master batch and the antioxidant 168 in a high-speed mixer for 5 minutes, wherein the stirring speed of the high-speed mixer is 400 revolutions per minute; and (3) blowing the mixed material through an FBSI-25/28 film blowing machine with the length-diameter ratio of 28:1, wherein the process parameters are as follows: the first zone was 160 ℃, the second zone was 175 ℃, the third zone was 195 ℃, the fourth zone was 195 ℃ to the sixth zone, the transition zone was 195 ℃, the die temperature was 195 ℃, and the blown film data are shown in table 2; the properties of the films are shown in Table 3. Wherein, the particle size of the master batch is tested according to GB/T27596-2011 standard; the yellowing resistance temperature is tested according to the standard HG/T3689-2014; the tensile strength was tested according to ASTM D-638; the light transmittance and the haze are tested according to the GB/T2410-2008 standard; the transmission was examined according to HG/T5077-2016; gloss was tested according to ASTM D2457; the onset time refers to the time from the start to the time when the host current of the screw machine shows a stable value, and the more short the time after the start, the more stable current value is reached, which indicates that the onset time is short and the onset is fast.
TABLE 2
Figure GDA0003214643410000101
As can be seen from the test results in Table 2, when the master batch of the fluorosilicone polymer processing aid prepared by the invention is used in a film blowing test of a polyethylene system, compared with a blank sample, after the master batch is added into each experimental group, the onset time, the melt pressure and the host current all show an obvious decline trend, and the coking condition of a die head is improved. The reason is analyzed and mainly lies in that: the fluorosilicone polymer processing aid master batch can quickly form a continuous lubricating coating on a cavity and a die opening by virtue of the flexibility and excellent processing characteristics of a fluorosilicone molecular chain, and well solves the problems of high melt pressure, large host current, coking of a die head, black spots and the like. The master batch of the fluorosilicone polymer processing aid can form a continuous and uniform low-surface-energy polymer coating structure in polymer processing resin, so that the processed polymer can smoothly slide through an interface, and the shear stress during processing is obviously reduced, thereby improving the processing performance, the product quality, the energy consumption, the production efficiency and the mechanical wear of the resin to different degrees. Compared with the prior art, the fluorosilicone polymer processing aid master batch has the characteristics of quick response time, excellent yellowing temperature resistance, small addition amount and the like.
TABLE 3
Figure GDA0003214643410000111
As can be seen from Table 3, when the master batch of the fluorosilicone polymer processing aid prepared by the invention is added into a polyethylene system, compared with a blank sample, the tensile strength of each experimental group is obviously improved after the master batch is added. In the aspect of haze, an experimental group adopting the master batch is lower than that of a blank sample, and the light transmittance, the transmittance and the glossiness of a system are obviously improved, wherein the light transmittance is improved by more than 2%, and the glossiness is improved by about 40%. The reason for this analysis is mainly: the fluorosilicone polymer processing aid master batch prepared by the invention improves the surface gloss, light transmittance and transmissivity of the agricultural film, improves the tensile strength of the product and stabilizes the product quality by virtue of the flexibility of a fluorosilicone molecular chain and the characteristic of easy precipitation and leveling of the film.
Furthermore, it is to be understood that the above-described embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be taken as limiting the invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims (8)

1. The master batch of the fluorosilicone polymer processing aid is characterized by comprising the following components in percentage by mass:
Figure FDA0003653490910000011
the polymer resin is one of EVA, LLDPE, LDPE, HDPE, ULDPE, XHDPE, XLDPE and PP;
the silicone rubber is dimethyl silicone rubber, methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber;
the fluorine-containing polymer is a copolymer of caprolactone, fluorine-containing elastomer and an interface dispersant; the interface dispersant is one or more of talcum powder, diatomite, calcium carbonate and silicon dioxide; the fluorine-containing elastomer is one or more of a copolymer of vinylidene fluoride and hexafluoropropylene, vinylidene fluoride, a terpolymer of hexafluoropropylene and tetrafluoroethylene, and a terpolymer of tetrafluoroethylene, vinylidene fluoride and propylene.
2. The fluorosilicone polymer processing aid masterbatch of claim 1, wherein: the polymer resin has a melt index of (1-10) g/10 min.
3. The fluorosilicone polymer processing aid masterbatch of claim 1, wherein: the antioxidant is one or more of antioxidant 1010, antioxidant 1076, antioxidant 215, antioxidant 168, antioxidant 300, antioxidant 626, antioxidant 1098 and antioxidant 3114.
4. The fluorosilicone polymer processing aid masterbatch of claim 1, wherein: the molecular weight of the fluoropolymer is 1000-100000.
5. The fluorosilicone polymer processing aid masterbatch of claim 1, wherein: the molecular weight of the silicone rubber is 200000-2000000.
6. The fluorosilicone polymer processing aid masterbatch of claim 1, wherein: the initiator is dicumyl peroxide.
7. The method for preparing a fluorosilicone polymer processing aid masterbatch according to any one of claims 1 to 6, comprising the steps of:
(1) weighing polymer resin, silicon rubber, an antioxidant, a fluorine-containing polymer and an initiator according to the mass percentage, and pretreating the fluorine-containing polymer in an oven for 30-60 min;
(2) mixing polymer resin, silicon rubber, fluorine-containing polymer and antioxidant in a high-speed mixer or an internal mixer for 1-10min, adding an initiator, and mixing for 5-10min to obtain a mixed material;
(3) and (3) putting the mixed material prepared in the step (2) into a double-screw extruder for melt extrusion granulation to prepare the processing aid master batch for the fluorosilicone polymer.
8. The method for preparing a fluorosilicone polymer processing aid masterbatch according to claim 7, wherein: the length-diameter ratio of the double-screw extruder is 40:1-52: 1; the conditions during the extrusion granulation are as follows: the temperatures in each stage were as follows: the feeding section is 40-60 ℃, the conveying section is 120-170 ℃, the melting section is 170-200 ℃, the head is 170-200 ℃, the residence time in the whole extrusion process is 1-3min, the die head pressure is 4-14MPa, the tail end of the extruder is vacuumized and exhausted, and the exhaust vacuum degree is-0.08 MPa to-0.1 MPa.
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