CN114426724A - Preparation method of special material for linear low-density polyethylene cast film - Google Patents
Preparation method of special material for linear low-density polyethylene cast film Download PDFInfo
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- CN114426724A CN114426724A CN202011181988.8A CN202011181988A CN114426724A CN 114426724 A CN114426724 A CN 114426724A CN 202011181988 A CN202011181988 A CN 202011181988A CN 114426724 A CN114426724 A CN 114426724A
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- linear low
- density polyethylene
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- 229920000092 linear low density polyethylene Polymers 0.000 title claims abstract description 64
- 239000004707 linear low-density polyethylene Substances 0.000 title claims abstract description 64
- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 35
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000004698 Polyethylene Substances 0.000 claims abstract description 21
- 229920000573 polyethylene Polymers 0.000 claims abstract description 21
- 239000005977 Ethylene Substances 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- -1 polyethylene Polymers 0.000 claims abstract description 18
- 239000000654 additive Substances 0.000 claims abstract description 16
- 230000000996 additive effect Effects 0.000 claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000005266 casting Methods 0.000 claims abstract description 9
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 6
- 239000004711 α-olefin Substances 0.000 claims abstract description 6
- 239000002114 nanocomposite Substances 0.000 claims abstract description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 239000003054 catalyst Substances 0.000 claims description 13
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 6
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims description 4
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 229910003074 TiCl4 Inorganic materials 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 claims description 3
- 238000004383 yellowing Methods 0.000 claims description 3
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 2
- 230000035699 permeability Effects 0.000 claims description 2
- 239000004411 aluminium Substances 0.000 claims 1
- 238000002844 melting Methods 0.000 claims 1
- 230000008018 melting Effects 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 5
- 239000011347 resin Substances 0.000 description 14
- 229920005989 resin Polymers 0.000 description 14
- 239000002994 raw material Substances 0.000 description 8
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000071 blow moulding Methods 0.000 description 4
- 239000003607 modifier Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 230000003078 antioxidant effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- VOITXYVAKOUIBA-UHFFFAOYSA-N triethylaluminium Chemical compound CC[Al](CC)CC VOITXYVAKOUIBA-UHFFFAOYSA-N 0.000 description 2
- 239000004594 Masterbatch (MB) Substances 0.000 description 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 125000005234 alkyl aluminium group Chemical group 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920001526 metallocene linear low density polyethylene Polymers 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920006280 packaging film Polymers 0.000 description 1
- 239000012785 packaging film Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
- C08F210/16—Copolymers of ethene with alpha-alkenes, e.g. EP rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
Abstract
The invention relates to a preparation method of a material special for a linear low-density polyethylene cast film. The method comprises the following steps: s1, carrying out polymerization reaction on ethylene and alpha-olefin to obtain linear low-density polyethylene powder; s2, mixing the polyethylene powder with a compound additive (specifically a spherical inorganic nano composite additive) to obtain a mixture; and then granulating the mixture to obtain the special material for the linear low-density polyethylene casting film. The special material for the linear low-density polyethylene cast film, prepared by the invention, solves the problem of a downstream customer mixing scheme and saves the labor cost. Meanwhile, the yellow index of the special material for the linear low-density polyethylene casting film prepared by the invention meets the requirements of the polyethylene casting film on processability, optical performance and the like. The film produced has high transparency, high gloss and good transparent appearance.
Description
Technical Field
The invention belongs to the technical field of polyethylene cast films, and particularly relates to a preparation method of a material special for a linear low-density polyethylene cast film.
Background
The traditional processing method of Polyethylene (PE) film mainly comprises two processes of blow molding and cast molding, wherein the blow molding PE film (IPE) is formed by blowing blow molding grade PE particles through a blow molding machine, and has low cost and most extensive application. The Cast Polyethylene (CPE) packaging film is a cast flat extruded polyethylene film which is produced by using polyethylene as a main raw material, adding a proper proportion of functional modified master batch and adopting a casting method and has no stretching and non-orientation. CPE has even thickness, good transparency, good glossiness, low heat sealing temperature, good flexibility, cold resistance and freezing resistance, can be used in extremely cold environment, has appearance far superior to IPE film, has wide development prospect, but has higher film price and limited application field due to factors such as production process, equipment, raw materials and the like, and has smaller quantity compared with IPE film at present. In recent years, as domestic CPE processing technology and equipment become mature and perfect, the yield of CPE films tends to increase.
After the problems of equipment, processing and processing aids and the like are solved in the production of the CPE film, the problem of specialization of the resin raw material becomes a main factor which hinders the development of the industry more and more. Downstream enterprises generally adopt LLDPE as main resin, about 10 percent of LDPE is added to increase the transparency of the film, and about 10 percent of mLLDPE is added to increase the mechanical property. The matching is a scheme which is discovered by downstream enterprises under the condition of no need, and has the advantages of reasonability and practicability, and the defects of unstable mixing and raw material fluctuation. And the produced CPE film still has the main problems of poor transparency, yellowing of the film, poor film appearance quality, and high production cost caused by frequent shutdown and film lip cleaning. Therefore, the special CPE material which is highly transparent and does not turn yellow and can prolong the production halt of enterprises for cleaning the film lips is developed, the product quality of the CPE film industry is improved, the blank of the special CPE resin material is filled, the market of the special CPE resin material is led, the development direction of structure adjustment of the current supply-side reforming industry is met, and the strategic requirements of national development for developing medium-high-end flexible package functional film materials in new chemical materials are clearly proposed in petrochemical and chemical industry development planning (2016-2020) in China.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the preparation method of the special material for the linear low-density polyethylene cast film, and the special material for the polyethylene cast film prepared by the method has good processing performance, excellent optical performance and mechanical performance and can meet the production requirements of polyethylene cast film manufacturers.
To this end, the first aspect of the present invention provides a method for preparing a material specially used for a linear low density polyethylene cast film, comprising the following steps:
s1, carrying out polymerization reaction on ethylene and alpha-olefin to obtain linear low-density polyethylene powder;
s2, mixing the polyethylene powder with a compound additive to obtain a mixture; and then granulating the mixture to obtain the special material for the linear low-density polyethylene casting film.
In some embodiments of the invention, the catalyst employed in the reaction is TiCl4/MgCl2. In some embodiments of the invention, the catalyst (TiCl) used for the reaction4/MgCl2) The designation of (a) may be SLC-S.
In some preferred implementations of the invention, the catalyst has an activity of 17000-23000 kg/kg.
In some embodiments of the invention, the cocatalyst employed in the reaction is an aluminum alkyl. In some embodiments of the invention, the aluminum alkyl may be triethylaluminum.
In other embodiments of the invention, the molecular weight regulator employed in the reaction is H2(ii) a Preferably, said H2The molar ratio of ethylene to ethylene is 0.25-0.35.
In some embodiments of the invention, the reaction is carried out at a temperature of 80 to 90 ℃ and a pressure of 1800 to 2800 kPa.
In other embodiments of the present invention, the molar ratio of a-olefin to ethylene is from 0.26 to 0.31.
In some preferred embodiments of the present invention, the a-olefin is selected from one or more of 1-butene, 1-hexene and 1-octene.
In some embodiments of the present invention, the amount of the compound additive is 0.2 wt% to 0.5 wt%, preferably 0.3 wt% to 0.4 wt% of the total weight of the material specially for linear low density polyethylene cast film. Correspondingly, the dosage of the polyethylene powder accounts for 99.5 wt% -99.8 wt%, preferably 99.6 wt% -99.7 wt% of the total weight of the material special for the linear low density polyethylene cast film.
In some preferred embodiments of the invention, the compound additive is a spherical inorganic nano composite additive with a particle size less than 100nm, and has the functions of resisting oxygen, increasing permeability, opening and resisting yellowing. In some embodiments of the invention, the compound additive may be named as CPEKK4020YH, and the CPEKK4020YH composition includes a primary antioxidant, a secondary antioxidant, a rheological aid, a functional group branching aid, and modified nano-silica.
In the invention, the polyethylene powder and the compound additive can be mixed at normal temperature and normal pressure, and the mixing time can be 1-5 minutes, preferably 2-4 minutes.
In some embodiments of the present invention, the temperature during the granulation may be 180 to 250 ℃, preferably 200 to 210 ℃.
In some embodiments of the invention, the melt index of the material specially used for the linear low density polyethylene cast film is 2-6 g/10min, preferably 3-4 g/10 min; the molecular weight distribution is 3-6, preferably 4-4.5; the density is 0.920-0.940 g/cm3Preferably 0.923 to 0.930g/cm3. In the present invention, the melt index was measured under the conditions of a temperature of 190 ℃ and a load of 2.16 kg.
In other embodiments of the present invention, the linear low density polyethylene cast film has a yellowness index of-4 to-2; preferably-4 to-3.5.
Therefore, the special material for the linear low-density polyethylene casting film has excellent optical property and processing property.
The special material for the linear low-density polyethylene cast film is special resin (linear low-density polyethylene resin), the special resin is prepared by polymerizing ethylene and alpha-olefin under the action of a catalyst and under the control of process (including parameter control of reaction temperature, addition of a molecular weight regulator (hydrogen) and the like) through a reaction device to produce linear low-density polyethylene powder, and then granulating the polyethylene powder and a compound additive to obtain the linear low-density polyethylene resin. The density, molecular weight distribution, melt index and yellow index of the resin all meet the requirements of preparing polyethylene cast films on polyethylene resin, and the resin can be used as a special material for the polyethylene cast films.
In some embodiments of the present invention, the method for preparing the material specially for the cast film of linear low density polyethylene specifically comprises the following steps:
(1) preparing linear low-density polyethylene powder: with TiCl4/MgCl2Catalyst (e.g., SLC-S) as the main catalyst, alkylaluminum as the cocatalyst, H2As molecular weight regulator, ethylene and alpha-olefin are made to produce slurry polymerization reaction in the reactor to obtain linear low density polyethylene powder; during reaction, the molar ratio of the alpha-olefin to ethylene is 0.26-0.31, and H in the reactor2The mol ratio of the catalyst to ethylene is 0.25-0.35, the reaction temperature is 80-90 ℃, the reaction pressure is 1800-2800 kPa, and the activity of the adopted catalyst is 17000-23000 kg/kg.
(2) Preparing a special material for the linear low-density polyethylene cast film: mixing the linear low-density polyethylene powder obtained in the step (1) with a compound additive at normal temperature and normal pressure for 2-4 minutes to obtain a mixture; and then, controlling the temperature at 200-210 ℃, and granulating by adopting a double-screw extruder to obtain the special material (namely, the linear low-density polyethylene resin) for the linear low-density polyethylene casting film.
The special material for the linear low-density polyethylene cast film obtained by the preparation method has the melt index of 2-6 g/10min, the molecular weight distribution of 3-6 and the density of 0.920-0.940 g/cm3The yellow index is-4 to-2, has good processing performance and optical performance, and can be suitable for polyethylene cast films.
The invention has the beneficial effects that: the special material for the linear low-density polyethylene cast film prepared by the method solves the problem of a mixing scheme of downstream customers, and saves labor cost. Meanwhile, the prepared special material for the linear low-density polyethylene cast film has a yellow index which meets the requirements of the polyethylene cast film on processability, optical performance and the like. The film produced has high transparency, high gloss and good transparent appearance.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description will proceed with reference being made to examples, which are intended to be illustrative only and are not intended to limit the scope of the invention. The starting materials or components used in the present invention may be commercially or conventionally prepared unless otherwise specified.
Example 1: preparation of linear low density polyethylene powder
1. The raw materials for producing the linear low-density polyethylene powder comprise the following substances:
(1) ethylene:
| item | Purity% | C2H2Content (wt.) | CO content | O2Content (wt.) | H2Content of O |
| Index (I) | ≥99.90 | ≤5×10-6 | ≤1×10-6 | ≤1×10-6 | ≤1×10-6 |
(2) 1-butene:
| item | Purity% | H2Content of O | CO content | CO2Content (wt.) | O2Content (wt.) | CH3OH content |
| Index (I) | ≥99.0 | ≤100×10-6 | ≤5×10-6 | ≤10×10-6 | ≤1×10-6 | ≤10×10-6 |
(3) Hydrogen gas:
| item | Purity% | H2Content of O | CO+CO2Content (wt.) | O2Content (wt.) |
| Index (I) | ≥93.0 | ≤5×10-6 | ≤5×10-6 | ≤10×10-6 |
(4) Catalyst: slurry catalyst SLC-S
2. Preparation of Linear Low Density polyethylene powder
In a continuous gas phase method fluidized bed reactor, ethylene monomer with the quality meeting the polymerization requirement is added, simultaneously, molecular weight regulator hydrogen and resin density regulator 1-butene are added, the molar ratio of hydrogen to ethylene is 0.3, the molar ratio of 1-butene to ethylene is 0.28, the pressure of the reactor is 2300kpa, the reaction temperature is controlled to be 86.5 ℃, the ethylene partial pressure is 500kpa, slurry polymerization is carried out under the action of a main catalyst SLC-S and a cocatalyst triethylaluminum 300ppm, so that linear low-density polyethylene powder is obtained, and the performance of the linear low-density polyethylene powder is shown in Table 1. The density of the synthesized linear low-density polyethylene powder is 0.928g/cm3Melt index 3.6g/10 min.
Example 2: preparation of linear low density polyethylene powder
1. Raw material for producing linear low-density polyethylene powder
The same as in example 1.
2. Preparation of Linear Low Density polyethylene powder
Essentially the same as example 1 except that hydrogen as a molecular weight modifier and 1-butene as a resin density modifier were added in a hydrogen/ethylene molar ratio of 0.35.
The properties of the obtained linear low density polyethylene powder are shown in Table 1.
Example 3: preparation of linear low density polyethylene powder
1. Raw material for producing linear low-density polyethylene powder
The same as in example 1.
2. Preparation of Linear Low Density polyethylene powder
Essentially the same as example 1 except that hydrogen as a molecular weight modifier and 1-butene as a resin density modifier were added in a 1-butene/ethylene molar ratio of 0.30.
The properties of the obtained linear low density polyethylene powder are shown in Table 1.
Example 4: preparation of linear low density polyethylene powder
1. Raw material for producing linear low-density polyethylene powder
The same as in example 1.
2. Preparation of Linear Low Density polyethylene powder
Essentially the same as example 1, except that the reaction temperature was controlled to 90 ℃.
The properties of the obtained linear low density polyethylene powder are shown in Table 1.
Table 1: properties of Linear Low Density polyethylene powder
Examples 5 to 9: preparation of special material for linear low-density polyethylene cast film
Mixing the linear low-density polyethylene powder prepared in the example 1 and a compound additive CPEKK4020YH in a high-speed mixer at normal temperature and pressure for 2-4 minutes according to the proportion shown in Table 2 to obtain a mixture; and then, controlling the temperature to be 200-210 ℃, and granulating by adopting a double-screw extruder to obtain the special material for the linear low-density polyethylene cast film. The material special for the linear low-density polyethylene cast film is subjected to physical property test analysis, and the result is shown in table 3.
Table 2: examples 5-9 formulation of Linear Low Density polyethylene powder and Complex additive
| Example 5 | Example 6 | Example 7 | Example 8 | Example 9 | |
| Linear low density polyethylene powder | 99.7％ | 99.68％ | 99.66％ | 99.64％ | 99.62％ |
| CPEKK4020YH | 0.3％ | 0.32％ | 0.34％ | 0.36％ | 0.38％ |
Table 3: physical property of special material for linear low density polyethylene casting film
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not constitute any limitation to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. A preparation method of a material special for a linear low-density polyethylene cast film comprises the following steps:
s1, carrying out polymerization reaction on ethylene and alpha-olefin to obtain linear low-density polyethylene powder;
s2, mixing the polyethylene powder with a compound additive to obtain a mixture; and then granulating the mixture to obtain the special material for the linear low-density polyethylene casting film.
2. The process of claim 1, wherein the catalyst used in the reaction is TiCl4/MgCl2(ii) a Preferably, the activity of the catalyst is 17000-23000 kg/kg.
3. A process according to claim 1 or 2, characterised in that the cocatalyst employed in the reaction is an aluminium alkyl.
4. The method according to any one of claims 1 to 3, wherein the molecular weight regulator used in the reaction is H2(ii) a Preferably, said H2The molar ratio of ethylene to ethylene is 0.25-0.35.
5. The process according to any one of claims 1 to 4, wherein the reaction temperature is 80 to 90 ℃ and the pressure is 1800 to 2800 kPa.
6. The process according to any one of claims 1 to 5, wherein the molar ratio of the a-olefin to ethylene is from 0.26 to 0.31; preferably, the a-olefin is selected from one or more of 1-butene, 1-hexene and 1-octene.
7. The method according to any one of claims 1 to 6, wherein the amount of the compound additive is 0.2 wt% to 0.5 wt%, preferably 0.3 wt% to 0.4 wt% of the total weight of the material specially used for the linear low density polyethylene cast film.
8. The method according to any one of claims 1 to 7, wherein the compound additive is a spherical inorganic nano composite additive with a particle size of less than 100nm and has the functions of resisting oxidation, increasing permeability, opening and yellowing.
9. The method according to any one of claims 1 to 8, wherein the melting of said material specific to said cast linear low density polyethylene filmThe index is 2-6 g/10min, preferably 3-4 g/10 min; the molecular weight distribution is 3-6, preferably 4-4.5; the density is 0.920-0.940 g/cm3Preferably 0.923 to 0.930g/cm3。
10. The method according to any one of claims 1 to 9, wherein said cast linear low density polyethylene film has a yellowness index of-4 to-2; preferably-4 to-3.5.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571026A (en) * | 2012-07-20 | 2014-02-12 | 中国石油化工股份有限公司 | Aging-resistant polyethylene resin specially used for rotational moulding, and preparation method thereof |
| CN203532190U (en) * | 2013-09-09 | 2014-04-09 | 中国石油化工股份有限公司 | Compressor inlet buffer tank |
| CN108794867A (en) * | 2017-04-28 | 2018-11-13 | 中国石油化工股份有限公司 | Polyethylene film masterbatch, blown film polyethylene composition and preparation method thereof |
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- 2020-10-29 CN CN202011181988.8A patent/CN114426724A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103571026A (en) * | 2012-07-20 | 2014-02-12 | 中国石油化工股份有限公司 | Aging-resistant polyethylene resin specially used for rotational moulding, and preparation method thereof |
| CN203532190U (en) * | 2013-09-09 | 2014-04-09 | 中国石油化工股份有限公司 | Compressor inlet buffer tank |
| CN108794867A (en) * | 2017-04-28 | 2018-11-13 | 中国石油化工股份有限公司 | Polyethylene film masterbatch, blown film polyethylene composition and preparation method thereof |
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Application publication date: 20220503 |