CN112574511A - Special material for centrifugally blowing polypropylene and preparation method thereof - Google Patents
Special material for centrifugally blowing polypropylene and preparation method thereof Download PDFInfo
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- D01F1/00—General methods for the manufacture of artificial filaments or the like
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- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/44—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds
- D01F6/46—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from mixtures of polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds as major constituent with other polymers or low-molecular-weight compounds of polyolefins
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Abstract
The invention discloses a special material for centrifugally blowing polypropylene, which comprises the following raw materials in parts by mass: 95-98 parts of polypropylene, 0.5-2 parts of a chain breaking agent for degrading and breaking chains, 1-10 parts of an anti-sticking agent and 1-10 parts of metallocene polypropylene. The invention also discloses a preparation method of the special material for the centrifugally-blown polypropylene, and the prepared special material for the centrifugally-blown polypropylene has the characteristics of no peculiar smell, high fluidity, low metal adhesion, no die head coating, easy centrifugal filamentation, good mechanical property, economy, low energy consumption and high yield.
Description
Technical Field
The invention belongs to the field of polypropylene modified special materials, and particularly relates to a centrifugal blowing polypropylene special material and a preparation method thereof.
Background
Ordinary polypropylene has a low melt index, is difficult to centrifugally blow into filaments, and is easy to adhere to a centrifugally blowing die head, so that polypropylene is gathered, heat transfer is influenced, and the die head is wrapped by polypropylene. The improvement of the melt index of polypropylene is divided into a pre-modification method and a post-modification method, wherein the pre-modification method is usually implemented in the propylene polymerization process, and the required equipment is complex and expensive; the post-modification method generally adds auxiliary agents such as a chain scission agent and the like into the polypropylene melt to achieve the purpose of improving the melt index, and the common polypropylene and the metallocene polypropylene with the melt index of 100-2000 are blended, so that the addition amount of other auxiliary agents is reduced, and the residues of organic matters and odor are effectively reduced.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a method for preparing the special material for centrifugally blowing polypropylene by degrading the chain-broken polypropylene by adopting odorless DCP and blending and modifying the chain-broken polypropylene with an anti-sticking agent and metallocene polypropylene (the melt index is 100-2000), and the special material has the characteristics of no peculiar smell, high fluidity, low metal adhesion, no die head coating, easy centrifugal filament forming, good mechanical property, economy, low energy consumption and high yield.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the material special for centrifugally blowing the polypropylene comprises the following raw materials in parts by mass: 95-98 parts of polypropylene, 0.5-2 parts of a chain breaking agent for degrading and breaking chains, 1-10 parts of an anti-sticking agent and 1-10 parts of metallocene polypropylene.
Preferably, the chain scission agent is odorless DCP.
Preferably, the anti-sticking agent is at least one of polyethylene wax and calcium stearate.
Preferably, the metallocene polypropylene has a melt index of 100-2000g/10 min.
The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
1) uniformly mixing 0.5-2 parts by mass of a chain scission agent and 95-98 parts by mass of dried polypropylene;
2) starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 200-;
3) adding 1-10 parts by mass of an anti-sticking agent and 1-10 parts by mass of metallocene polypropylene at the tail end of the chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating the extruded melt to obtain the special material for the centrifugally-blown polypropylene.
Preferably, the chain scission agent in the preparation method of the centrifugal blowing polypropylene special material is odorless DCP.
Preferably, in the preparation method of the centrifugal blowing polypropylene special material, the anti-sticking agent is at least one of polyethylene wax and calcium stearate.
Preferably, the preparation method of the centrifugally-sprayed polypropylene special material further comprises the following polypropylene pretreatment step before the step 1):
1.1) uniformly mixing 0.8-2.5 parts by mass of composite initiator and 90-100 parts by mass of dried polypropylene;
1.2) starting an extruder, uniformly feeding the uniformly mixed materials from a hopper, wherein the rotating speed of a screw is 200-;
1.3) uniformly mixing 1-5 parts by mass of vinyl long-chain unsaturated silane, 1-5 parts by mass of maleic anhydride and 0.1-2 parts by mass of catalyst for catalyzing vinyl long-chain unsaturated silane, and pumping the mixture by using a metering pump of an extruder; adjusting the rotation speed of the screw, the feeding rate and the liquid flow of the metering pump to complete the reaction of the raw materials, and cooling and pelletizing the extruded melt to obtain the pretreated polypropylene.
Preferably, the composite initiator is: 0.3-1.5 parts of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and 0.5-1 part of benzoyl peroxide.
Preferably, the catalyst for catalyzing the vinyl long-chain unsaturated silane is: dibutyltin dilaurate.
The invention has the beneficial effects that:
1. the odorless DCP is used as a degradation agent, so that the problems that the melt index of polypropylene is too slow (the MFR of general extruded polypropylene is less than 10 g/10 min) and the free radicals generated by excessive peculiar smell and difficulty in removing auxiliaries easily emit harmful gases in the production process and products are solved; the special material for centrifugally blowing the polypropylene has no peculiar smell, and the melt index is greatly improved to 15-200g/10 min;
2. the problem of polypropylene adhering to a die head is solved by adopting the anti-sticking agent for blending modification, and the metal adhesion is low;
3. the adoption of the blending of metallocene polypropylene can improve the centrifugal filamentation efficiency of polypropylene and increase the elongation at break of filamentation;
4. the polypropylene special material prepared by the invention is used for blowing and spinning, the spinning can reach 0.1-5 mu m, and the polypropylene special material has the characteristics of good spinning performance and wide application range.
Detailed Description
The production process of the present invention will be described in further detail with reference to examples.
Example 1
1. A special material for centrifugally blowing polypropylene comprises the following components in parts by mass:
95 parts of polypropylene, 0.5 part of chain scission agent for degrading chain scission, 1 part of anti-sticking agent and 1 part of metallocene polypropylene.
The chain scission agent is odorless DCP, the anti-sticking agent is polyethylene wax, and the melt index of the metallocene polypropylene is 100.
2. The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
firstly, 0.5 part of odorless DCP and 95 parts of dried polypropylene are uniformly mixed;
secondly, starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 200 revolutions per minute, and the heating temperature is 190 ℃ so as to carry out chain scission reaction;
step three, uniformly feeding 1 part of polyethylene wax and 1 part of metallocene polypropylene from a hopper of an extruder at the tail end of the chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 15g/10min, the tensile strength is 51.9MPa, the elongation at break is 697.3%, the odor grade is 1, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 2
1. A special material for centrifugally blowing polypropylene comprises the following components in parts by mass:
96 parts of polypropylene, 1 part of chain scission agent for degrading chain scission, 5 parts of anti-sticking agent and 5 parts of metallocene polypropylene.
The chain scission agent is odorless DCP, the anti-sticking agent is polyethylene wax, and the melt index of the metallocene polypropylene is 1000.
2. The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
firstly, uniformly mixing 1 part of odorless DCP and 96 parts of dried polypropylene;
secondly, starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 300 revolutions per minute, and the heating temperature is 210 ℃ so as to carry out chain scission reaction;
step three, feeding 5 parts of polyethylene wax and 5 parts of metallocene polypropylene uniformly from a hopper of an extruder at the end of a chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 68g/10min, the tensile strength is 50.3MPa, the elongation at break is 679.5%, the odor grade is 2, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 3
1. A special material for centrifugally blowing polypropylene comprises the following components in parts by mass:
98 parts of polypropylene, 2 parts of a chain scission agent for degrading chain scission, 10 parts of an anti-sticking agent and 10 parts of metallocene polypropylene.
The chain scission agent is odorless DCP, the anti-sticking agent is polyethylene wax, and the melt index of the metallocene polypropylene is 2000.
2. The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
step one, uniformly mixing 2 parts of odorless DCP and 98 parts of dried polypropylene;
secondly, starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 400 revolutions per minute, and the heating temperature is 240 ℃ so as to carry out chain scission reaction;
step three, feeding 10 parts of polyethylene wax and 10 parts of metallocene polypropylene uniformly from a hopper of an extruder at the end of a chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 133g/10min, the tensile strength is 49.1MPa, the elongation at break is 682.8%, the odor grade is 1, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 4
1. A special material for centrifugally blowing polypropylene comprises the following components in parts by mass:
95 parts of polypropylene, 0.5 part of chain scission agent for degrading chain scission, 10 parts of anti-sticking agent and 10 parts of metallocene polypropylene.
The chain scission agent is odorless DCP, the anti-sticking agent is a mixture of polyethylene wax and calcium stearate in a mass ratio of 1:1, and the melt index of the metallocene polypropylene is 100.
2. The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
firstly, 0.5 part of odorless DCP and 95 parts of dried polypropylene are uniformly mixed;
secondly, starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 200 revolutions per minute, and the heating temperature is 190 ℃ so as to carry out chain scission reaction;
step three, feeding 5 parts of calcium stearate, 5 parts of polyethylene wax and 10 parts of metallocene polypropylene uniformly from a hopper of an extruder at the end of a chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 147g/10min, the tensile strength is 53.7MPa, the elongation at break is 696.3%, the odor grade is 1, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 5
1. A special material for centrifugally blowing polypropylene comprises the following components in parts by mass:
96 parts of polypropylene, 1 part of chain scission agent for degrading chain scission, 5 parts of anti-sticking agent and 5 parts of metallocene polypropylene.
The chain scission agent is odorless DCP, the anti-sticking agent is calcium stearate, and the melt index of the metallocene polypropylene is 1000.
2. The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
firstly, uniformly mixing 1 part of odorless DCP and 96 parts of dried polypropylene;
secondly, starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 300 revolutions per minute, and the heating temperature is 210 ℃ so as to carry out chain scission reaction;
step three, feeding 5 parts of calcium stearate and 5 parts of metallocene polypropylene uniformly from a hopper of an extruder at the end of the chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 138g/10min, the tensile strength is 49.6MPa, the elongation at break is 687.7%, the odor grade is 2, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 6
1. A special material for centrifugally blowing polypropylene comprises the following components in parts by mass:
98 parts of polypropylene, 2 parts of a chain scission agent for degrading chain scission, 1 part of an anti-sticking agent and 1 part of metallocene polypropylene.
The chain scission agent is odorless DCP, the anti-sticking agent is calcium stearate, and the melt index of the metallocene polypropylene is 2000.
2. The preparation method of the centrifugal blowing polypropylene special material comprises the following steps:
step one, uniformly mixing 2 parts of odorless DCP and 98 parts of dried polypropylene;
secondly, starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 400 revolutions per minute, and the heating temperature is 240 ℃ so as to carry out chain scission reaction;
step three, feeding 1 part of calcium stearate and 1 part of metallocene polypropylene uniformly from a hopper of an extruder at the end of the chain scission reaction; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 88g/10min, the tensile strength is 52.9MPa, the elongation at break is 681.1%, the odor grade is 2, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 7
Example 7 adds a polypropylene pretreatment step and is otherwise the same as example 3.
A preparation method of a special material for centrifugally blowing polypropylene comprises the following steps:
the method comprises the following steps: polypropylene pretreatment
1) Uniformly mixing 0.8 part by mass of composite initiator and 90 parts by mass of dried polypropylene;
2) starting an extruder, uniformly feeding the uniformly mixed materials from a hopper, wherein the rotating speed of a screw is 200 revolutions per minute, and the heating temperature is 180 ℃;
3) uniformly mixing 1 part by mass of vinyl long-chain unsaturated silane, 1 part by mass of maleic anhydride and 0.1 part by mass of a catalyst for catalyzing the vinyl long-chain unsaturated silane, and pumping the mixture into an extruder by a metering pump; adjusting the rotation speed of the screw, the feeding rate and the liquid flow of the metering pump to complete the reaction, and cooling and granulating the extruded melt to obtain the pretreated polypropylene.
The composite initiator comprises 0.3 part by mass of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and 0.5 part by mass of benzoyl peroxide, and the catalyst is dibutyltin dilaurate.
Step two: 2 parts by mass of odorless DCP and 98 parts by mass of dried pretreated polypropylene are mixed uniformly.
Step three: starting the extruder, uniformly feeding the mixture from the hopper, wherein the rotating speed of the screw is 400 r/min, and the heating temperature is 240 ℃ so as to carry out chain scission reaction.
Step four: at the end of the chain scission reaction, uniformly feeding 10 parts by mass of polyethylene wax and 10 parts by mass of metallocene polypropylene from a hopper of an extruder; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 196g/10min, the tensile strength is 60.9MPa, the elongation at break is 762.9%, the odor grade is 2, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 8
Example 8 adds a polypropylene pretreatment step and is otherwise the same as example 3.
A preparation method of a special material for centrifugally blowing polypropylene comprises the following steps:
the method comprises the following steps: polypropylene pretreatment
1) Uniformly mixing 1.6 parts by mass of composite initiator with 95 parts by mass of dried polypropylene;
2) starting an extruder, uniformly feeding the uniformly mixed materials from a hopper, wherein the rotating speed of a screw is 300 revolutions per minute, and the heating temperature is 210 ℃;
3) uniformly mixing 3 parts by mass of vinyl long-chain unsaturated silane, 3 parts by mass of maleic anhydride and 1 part by mass of a catalyst for catalyzing the vinyl long-chain unsaturated silane, and pumping the mixture by using a metering pump of an extruder; adjusting the rotation speed of the screw, the feeding rate and the liquid flow of the metering pump to complete the reaction, and cooling and granulating the extruded melt to obtain the pretreated polypropylene.
The composite initiator comprises 0.9 part by mass of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and 0.7 part by mass of benzoyl peroxide, and the catalyst is dibutyltin dilaurate.
Step two: 2 parts by mass of odorless DCP and 98 parts by mass of dried pretreated polypropylene are mixed uniformly.
Step three: starting the extruder, uniformly feeding the mixture from the hopper, wherein the rotating speed of the screw is 400 r/min, and the heating temperature is 240 ℃ so as to carry out chain scission reaction.
Step four: at the end of the chain scission reaction, uniformly feeding 10 parts by mass of polyethylene wax and 10 parts by mass of metallocene polypropylene from a hopper of an extruder; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 188g/10min, the tensile strength is 61.8MPa, the elongation at break is 775.1%, the odor grade is 2, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Example 9
Example 9 adds a polypropylene pretreatment step and is otherwise the same as example 3.
A preparation method of a special material for centrifugally blowing polypropylene comprises the following steps:
the method comprises the following steps: polypropylene pretreatment
1) Uniformly mixing 2.5 parts by mass of composite initiator with 100 parts by mass of dried polypropylene;
2) starting an extruder, uniformly feeding the uniformly mixed materials from a hopper, wherein the rotating speed of a screw is 400 revolutions per minute, and the heating temperature is 240 ℃;
3) uniformly mixing 5 parts by mass of vinyl long-chain unsaturated silane, 5 parts by mass of maleic anhydride and 2 parts by mass of a catalyst for catalyzing the vinyl long-chain unsaturated silane, and pumping the mixture into an extruder by a metering pump; adjusting the rotation speed of the screw, the feeding rate and the liquid flow of the metering pump to complete the reaction, and cooling and granulating the extruded melt to obtain the pretreated polypropylene.
The composite initiator comprises 1.5 parts by mass of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and 1 part by mass of benzoyl peroxide, and the catalyst is dibutyltin dilaurate.
Step two: 2 parts by mass of odorless DCP and 98 parts by mass of dried pretreated polypropylene are mixed uniformly.
Step three: starting the extruder, uniformly feeding the mixture from the hopper, wherein the rotating speed of the screw is 400 r/min, and the heating temperature is 240 ℃ so as to carry out chain scission reaction.
Step four: at the end of the chain scission reaction, uniformly feeding 10 parts by mass of polyethylene wax and 10 parts by mass of metallocene polypropylene from a hopper of an extruder; adjusting the rotation speed and the feeding speed of the screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
The melt index of the special material for centrifugally blowing the polypropylene prepared by the method is 200g/10min, the tensile strength is 59.6MPa, the elongation at break is 769.0%, the odor grade is 2, the reaction is uniform and stable, the product quality is high, and the product stability is good.
Comparative example 1
Comparative example 1 used polypropylene without any treatment and was the same as the starting polypropylene in the present invention.
Performance detection
The polypropylene speciality materials of examples 1 to 9 and the polypropylene of comparative example 1 were subjected to the performance tests of melt index (MFR), tensile strength, elongation at break and odor grade (odor grade test according to GB/T36246-2018), and the results are shown in Table 1.
TABLE 1
As can be seen from Table 1, the material special for polypropylene by centrifugal blowing has no interference and pungent smell; the melt index is obviously improved and can reach 15-200g/10min, the adhesion is reduced, and the problem of die head adhesion is effectively solved; in addition, the tensile strength of the special material for the centrifugally-blown polypropylene can be improved by 56 percent at most, the elongation at break can be improved by 48 percent at most, and the mechanical property of the special material for the centrifugally-blown polypropylene is obviously improved.
Claims (10)
1. The special material for centrifugally blowing the polypropylene is characterized by comprising the following raw materials in parts by mass:
95-98 parts of polypropylene, 0.5-2 parts of a chain breaking agent for degrading and breaking chains, 1-10 parts of an anti-sticking agent and 1-10 parts of metallocene polypropylene.
2. The special material for the polypropylene by centrifugal blowing according to claim 1, wherein the chain scission agent is odorless DCP.
3. The material for polypropylene according to claim 1 or 2, wherein the anti-sticking agent is at least one of polyethylene wax and calcium stearate.
4. The special material for polypropylene by centrifugal blowing as claimed in claim 1 or 2, wherein the melt index of the metallocene polypropylene is 100-2000g/10 min.
5. A method for preparing a material special for centrifugally blowing polypropylene as claimed in claim 1, which is characterized by comprising the following steps:
1) uniformly mixing 0.5-2 parts by mass of a chain scission agent and 95-98 parts by mass of dried polypropylene;
2) starting an extruder, uniformly feeding the mixture from a hopper, wherein the rotating speed of a screw is 200-;
3) adding 1-10 parts by mass of an anti-sticking agent and 1-10 parts by mass of metallocene polypropylene at the tail end of the chain scission reaction, adjusting the rotating speed and the feeding speed of a screw to fully react, cooling and granulating after melt extrusion to obtain the special material for the centrifugally blown polypropylene.
6. The method for preparing polypropylene material according to claim 5, wherein the chain-breaking agent is odorless DCP.
7. The method for preparing polypropylene speciality material for centrifugal blowing according to claim 5, wherein the anti-sticking agent is at least one of polyethylene wax and calcium stearate.
8. The method for preparing polypropylene by centrifugal blowing according to claim 5, wherein the step 1) is preceded by a step of pretreating polypropylene, specifically comprising the following steps:
1.1) uniformly mixing 0.8-2.5 parts by mass of composite initiator and 90-100 parts by mass of dried polypropylene;
1.2) starting an extruder, uniformly feeding the uniformly mixed materials from a hopper, wherein the rotating speed of a screw is 200-;
1.3) uniformly mixing 1-5 parts by mass of vinyl long-chain unsaturated silane, 1-5 parts by mass of maleic anhydride and 0.1-2 parts by mass of catalyst for catalyzing vinyl long-chain unsaturated silane, and pumping the mixture by using a metering pump of an extruder; adjusting the rotation speed of the screw, the feeding rate and the liquid flow of the metering pump to complete the reaction of the raw materials, and cooling and pelletizing the extruded melt to obtain the pretreated polypropylene.
9. The method for preparing polypropylene by centrifugal blowing according to claim 8, wherein the composite initiator is: 0.3-1.5 parts of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane and 0.5-1 part of benzoyl peroxide.
10. The method for preparing polypropylene by centrifugal blowing according to claim 8, wherein the catalyst for catalyzing vinyl long-chain unsaturated silane is: dibutyltin dilaurate.
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| CN (1) | CN112574511A (en) |
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