CN114702741A - Low-density polyethylene material and preparation method and application thereof - Google Patents
Low-density polyethylene material and preparation method and application thereof Download PDFInfo
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- 229920001684 low density polyethylene Polymers 0.000 title claims abstract description 95
- 239000004702 low-density polyethylene Substances 0.000 title claims abstract description 95
- 239000000463 material Substances 0.000 title claims abstract description 75
- 238000002360 preparation method Methods 0.000 title claims abstract description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 42
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 41
- 239000000314 lubricant Substances 0.000 claims abstract description 20
- -1 pentaerythritol ester Chemical class 0.000 claims description 20
- 238000012360 testing method Methods 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 14
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 9
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 9
- 239000000155 melt Substances 0.000 claims description 8
- VWGKEVWFBOUAND-UHFFFAOYSA-N 4,4'-thiodiphenol Chemical compound C1=CC(O)=CC=C1SC1=CC=C(O)C=C1 VWGKEVWFBOUAND-UHFFFAOYSA-N 0.000 claims description 6
- 239000004605 External Lubricant Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 150000001408 amides Chemical group 0.000 claims description 4
- 229930185605 Bisphenol Natural products 0.000 claims description 3
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical group CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 3
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 claims description 3
- HXIQYSLFEXIOAV-UHFFFAOYSA-N 2-tert-butyl-4-(5-tert-butyl-4-hydroxy-2-methylphenyl)sulfanyl-5-methylphenol Chemical compound CC1=CC(O)=C(C(C)(C)C)C=C1SC1=CC(C(C)(C)C)=C(O)C=C1C HXIQYSLFEXIOAV-UHFFFAOYSA-N 0.000 claims description 2
- WPMYUUITDBHVQZ-UHFFFAOYSA-N 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoic acid Chemical compound CC(C)(C)C1=CC(CCC(O)=O)=CC(C(C)(C)C)=C1O WPMYUUITDBHVQZ-UHFFFAOYSA-N 0.000 claims description 2
- 229920001577 copolymer Polymers 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims 1
- 229920006124 polyolefin elastomer Polymers 0.000 abstract description 16
- 230000032683 aging Effects 0.000 abstract description 4
- 238000004383 yellowing Methods 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 description 18
- 229920000573 polyethylene Polymers 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 229920003023 plastic Polymers 0.000 description 8
- 239000004033 plastic Substances 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 7
- 238000001746 injection moulding Methods 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000001035 drying Methods 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 4
- 239000000806 elastomer Substances 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 239000004610 Internal Lubricant Substances 0.000 description 2
- 239000002537 cosmetic Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 235000013305 food Nutrition 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010985 leather Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical group CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- REYJJPSVUYRZGE-UHFFFAOYSA-N Octadecylamine Chemical class CCCCCCCCCCCCCCCCCCN REYJJPSVUYRZGE-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000007849 functional defect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- HKUFIYBZNQSHQS-UHFFFAOYSA-N n-octadecyloctadecan-1-amine Chemical class CCCCCCCCCCCCCCCCCCNCCCCCCCCCCCCCCCCCC HKUFIYBZNQSHQS-UHFFFAOYSA-N 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000344 soap Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/10—Transparent films; Clear coatings; Transparent materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention discloses a low-density polyethylene material and a preparation method and application thereof. The low-density polyethylene material comprises the following components in parts by weight: 55-70 parts of low-flow LDPE, 10-20 parts of high-flow LDPE, 15-30 parts of polyolefin elastomer, 0.5-1 part of lubricant and 0.1-0.75 part of antioxidant. According to the invention, the lubricant and the antioxidant are added into the low-flow LDPE, high-flow LDPE and POE systems, so that the flexibility of the material is improved, the aging of the material is reduced, the color L value is kept, and the yellowing is inhibited, and the obtained low-density polyethylene material has the characteristics of higher mechanical strength, super-softness, high transparency and good color, and is suitable for being used as a soft cap material, especially a hollow bottle soft cap material.
Description
Technical Field
The invention relates to the field of polypropylene materials, in particular to a low-density polyethylene material and a preparation method and application thereof.
Background
The polyethylene has good fluidity, low processing temperature, moderate viscosity and higher decomposition temperature, does not decompose at the temperature lower than 300 ℃ in inert gas, and is plastic with good processing performance. Polyethylene has low water absorption, does not need drying treatment before processing, is cheap and easy to obtain, and therefore, the packaging industry, especially the cosmetic packaging industry, generally adopts polyethylene as a packaging material. Although the conventional commercial low-density polyethylene new material or low-density polyethylene recycled material is the material with the lowest hardness and the best transparency in polyethylene, the material still cannot completely meet the softness and texture required by a soft cover and the high transparency required by design.
Meanwhile, the global plastic white pollution is increasingly serious, and various countries have policies for supposing treatment of the white pollution, for example, European collection of plastics tax for plastics with the content of the reclaimed material below 30% is started, and the use of the reclaimed material in various industries is more and more popular. Almost all international enterprises that use plastics have set forth goals in sustainable development. To achieve the "new plastics economy" 2025 goal, almost all international enterprises using virgin resins have initiated plans and established targets for using recycled plastics: except a few medicines, foods and infant products, the use of 500 ten thousand tons of recycled plastics is promised.
Under the environment that various industries greatly promote the use of reclaimed materials, aiming at the functional defects of polyethylene, the invention obtains the low-density polyethylene material which is suitable for soft covers, has higher mechanical strength, good soft texture and high transparency by a modification technology. The material can adopt a new polyethylene material as a raw material, and can also adopt a regenerated polyethylene material as a raw material.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide a low-density polyethylene material, and a preparation method and application thereof. The low-density polyethylene material has the characteristics of high mechanical strength, super softness and high transparency, has good color and is suitable for being used as a soft cover material.
In order to realize the purpose, the technical scheme adopted by the invention is as follows: a low-density polyethylene material comprises the following components in parts by weight: 55-70 parts of low-flow LDPE, 10-20 parts of high-flow LDPE, 15-30 parts of polyolefin elastomer (POE), 0.5-1 part of lubricant and 0.1-0.75 part of antioxidant.
Preferably, the low density polyethylene material comprises the following components in parts by weight: 60-65 parts of low-flow LDPE, 13-18 parts of high-flow LDPE, 20-25 parts of polyolefin elastomer (POE), 0.6-0.8 part of lubricant and 0.2-0.45 part of antioxidant.
Preferably, the low flow LDPE has a melt index of 1 to 3g/10min at 190 ℃ under 2.16kg test conditions, performed according to test standard GB/T3682.1-2018. High melt index LDPE has lower mechanical strength but good clarity; low melt index LDPE has high mechanical strength, but poor softness and clarity; when the melt indexes of the two LDPE resins are within the range and are compounded according to a certain weight part, the resin matrix which is uniformly mixed and has no phase separation can be ensured to be prepared, and the processability is good.
In certain embodiments, the low flow LDPE can be recycled regrind, the recycled source can be a natural color transparent packaging bag with the LDPE as the main component, and the LDPE content is not less than 60 wt%; the transparent packaging bag is derived from inner packaging bags of products such as food, electronic appliances and the like, and has no impurities such as printing, glue and the like.
Preferably, the high flow LDPE has a melt index of 45 to 70g/10min at 190 ℃ under 2.16kg test conditions, performed according to test standard GB/T3682.1-2018.
In certain embodiments, the high flow LDPE may be recycled and the source of recycling may be PE foamed leather.
In certain embodiments, the low flow LDPE and high flow LDPE regrind are recovered by: crushing, washing, spin-drying, extruding and granulating the recycled LDPE to obtain particles; the temperature of an extruder adopted by extrusion is set to be 80 +/-5 ℃, and the extrusion speed is 60 +/-5 hz. After the treatment by the method, the yellowness of the low-flow LDPE reclaimed material and the high-flow LDPE reclaimed material can be reduced, namely the color L value is greatly reduced, and the level close to that of a new material is reached. When the extrusion temperature is higher than 80 ℃, under the action of moisture, free radicals can be decomposed from the polyethylene after consumption due to a small amount of pollutants and detergents, and the peroxide is decomposed into hydrogen ions with high activity, so that the material is slightly crosslinked, aged and yellowed. And the low-temperature extrusion is adopted, and granulation is carried out after moisture is removed, so that the risk of aging and yellowing of the material can be greatly reduced, and the softness and transparency of the material are not influenced.
Preferably, the POE is an ethylene-octene copolymer having a melt index of 3 to 10g/10min at 190 ℃ under 2.16kg, performed according to the test standard GB/T3682.1-2018.
Preferably, the lubricant is an external lubricant; more preferably, the lubricant is an amide based lubricant including amide soaps, stearyl amides, bis-stearyl amides; most preferably, the amide lubricant is Ethylene Bis Stearamide (EBS). The external lubricant is microscopically incompatible with the low-flow LDPE and the high-flow LDPE, so that the low-flow LDPE and the high-flow LDPE are microscopically separated from POE with a specific melt index, the POE and the lubricant are more emerged on the polyethylene surface layer, the surface hardness of the material is reduced, and the material has softer texture.
Preferably, the antioxidant is a compound of a thio-bisphenol antioxidant, a hindered phenol antioxidant and a phosphite antioxidant; more preferably, the mass ratio of the thio-bisphenol antioxidant to the hindered phenol antioxidant to the phosphite antioxidant is (1-2): (1-2): (1-2); still more preferably, the thio-type bisphenol antioxidant is 4,4' -thiobis (6-tert-butyl-3-methylphenol) (KG 906); the hindered phenol antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester (antioxidant 1010); the phosphite antioxidant is selected from tris (2, 4-di-tert-butylphenyl) phosphite (antioxidant 168).
In the application, the compound of the thio-bisphenol antioxidant, the hindered phenol antioxidant and the phosphite antioxidant can efficiently capture free radicals or peroxide ions generated in the high-temperature (>150 ℃) and high-shear (>450HZ) processes of the low-flow LDPE and the high-flow LDPE complex system, so that the material is effectively prevented from being aged and yellowed; meanwhile, on the basis, further research shows that the number of crystal points and black points of the recycled polyethylene can be obviously reduced by selecting a specific thio-bisphenol, hindered phenol and phosphite antioxidant compound system in a specific proportion range, the color L value is kept unchanged, the yellowness is reduced, and the high transparency of the LDPE is kept.
The preparation method of the low-density polyethylene material comprises the following steps: mixing the low-flow LDPE, the high-flow LDPE and the POE, adding the antioxidant and the lubricant, mixing again, extruding and granulating to obtain the low-density polyethylene material.
Preferably, the length, width and height of the granules of the low-flow LDPE, the high-flow LDPE and the POE are all 3-5 mm. If the particle size difference is large or the length, width, height and size are small or large, the processing is not facilitated, and certain adverse effects may be caused on the softness, transparency and color of the low-density polyethylene material.
Preferably, the mixing is 25 + -5 rpm for 30 + -5 s.
Preferably, the remixing is 25. + -.5 rpm mixing for 2. + -.0.1 min.
Preferably, the extrusion adopts a filtering type single-screw extruder, the diameter is 150mm, the extrusion temperature is 150 ℃ and 180 ℃, and the screw rotation speed is 450 ℃ and 550 HZ.
Further preferably, the filter is a double-column type, and the mesh number of the filter screen is 120-150 meshes.
The application of the low-density polyethylene material in preparing a soft cover.
Preferably, the soft cover is a hollow bottle soft cover, in particular a cosmetic packaging bottle soft cover.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the low-flow LDPE and the high-flow LDPE are compounded in a proper proportion, so that the resin matrix which is uniformly mixed and does not have phase separation can be ensured to be prepared, and the processing performance is good, on the basis, a proper external lubricant is added into a specific polyethylene-POE system to promote the formation of the micro incompatibility phenomenon of POE and polyethylene, so that POE can emerge on the polyethylene surface layer more, and a polyethylene material which is softer and has lower hardness is obtained; meanwhile, a special compound antioxidant is added, so that the aging and yellowing of polyethylene under high temperature and high shear are effectively prevented, and the low-density polyethylene material for the soft cover, which has high mechanical strength, super softness, high transparency and good color, is successfully prepared.
In addition, the invention adopts the mode of low-temperature extrusion to process and recover LDPE (namely low-flow LDPE reclaimed material and high-flow LDPE reclaimed material), so that the aging of the material can be further reduced, and the color L value of the material can be better maintained.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
In the examples, the experimental methods used were all conventional methods unless otherwise specified, and the materials, reagents and the like used were commercially available without otherwise specified.
The raw materials used in the examples and comparative examples are illustrated in Table 1.
TABLE 1
The melt indices of the materials in Table 1 were all tested using the test standard GB/T3682.1-2018.
The low-flow LDPE reclaimed material is obtained by recovering the following steps: crushing, washing, spin-drying, extruding and granulating the recovered packaging bags to obtain particles with the length, width and height of 5mm x 3 mm; the temperature of the extruder used for extrusion was set at 82 ℃ and the extrusion speed was 60 rpm.
The high-flow LDPE reclaimed material is obtained by recovering the following steps: crushing, washing, spin-drying, extruding and forming the recovered PE foamed leather, and dicing to obtain particles with the length, width and height of 5mm x 3mm respectively; the temperature of an extruder used for extrusion was set to 85 ℃ and the extrusion speed was 65 rpm.
The length, width and height of the POE particles are respectively 5mm x 3 mm.
In the following examples and comparative examples, unless otherwise specified, the antioxidant and the lubricant were commercially available, and the same antioxidant and lubricant were used in parallel experiments.
Examples 1 to 10 and comparative examples 1 to 14
The low density polyethylene materials of examples 1 to 10 and comparative examples 1 to 14 were shown in Table 2 and Table 3 in terms of the components and parts by weight, respectively.
TABLE 2
TABLE 3
The low density polyethylene materials of examples 1-10 and comparative examples 1-14 were prepared by a process comprising the steps of:
and (3) putting the low-flow LDPE, the high-flow LDPE and the POE into a mixer, mixing for 30s at 25rpm, adding the antioxidant and the lubricant, and mixing for 2min at 25rpm to obtain the premix. Adding the premix into a single-screw extruder, extruding and granulating to obtain the low-density polyethylene material. The diameter of the single-screw extruder is 150mm, and the single-screw extruder is simultaneously provided with a double-column filter, and the mesh number of the filter screen of the filter is 150 meshes. The extrusion temperature was 160 ℃ and the screw rotation speed was 500 Hz.
Performance testing
The low density polyethylene materials of examples 1-10 and comparative examples 1-14 were tested for their performance by the following specific test methods:
melt index: selecting a weight of 2.16kg according to GB/T3682.1-2018, and testing at 190 ℃;
tensile strength: after injection molding and stretching a sample strip by an injection molding machine, testing according to a GB/T1040.3-2018 method, wherein the unit is MPa;
elongation at break: after an injection molding machine is adopted to injection mold a stretched sample strip, testing according to a GB/T1040.3-2018 method, wherein the unit is;
shore hardness: after the square plate is injection-molded by an injection molding machine, the square plate is placed at normal temperature for 24 hours, and the thickness of the square plate is 4mm by using a Shore hardness tester;
light transmittance: using an injection molding machine to injection mold a square plate with the size of 10 x 2mm, then placing the square plate at 25 ℃ for 24 hours, and using a luminometer to test; and simultaneously, testing the color L value by using a color difference meter.
The test results are shown in table 4.
TABLE 4
The results of comparative examples 2, 3, 4 and 6 in Table 4 show that when the content of POE elastomer is too high, or the content of low-flow LDPE is too low, or the content of low-flow LDPE is too high, or the content of high-flow LDPE is too high, the tensile strength of the material is lower, and the requirements of the soft cover on the material are not met; the results of comparative examples 4, 6, 7, 8, 9, 12 show that when the low flow LDPE content is too high, or the high flow LDPE content is too high, or the antioxidant content is too high, or the external lubricant content is too high or too low, or the internal lubricant PE wax is used, the resulting material has low light transmittance; the results of comparative examples 1, 4, 5, 6, 8, 10, 12 show that when the POE elastomer content is too low, the external lubricant content is too low, or the high flow LDPE content is too low or too high, or the low flow LDPE content is too high, or elastomer SBS is used, or internal lubricant PE wax is used, the hardness of the material is too high, and the material is not suitable as a soft cap material; the results of comparative examples 11, 13 and 14 show that the combination of the antioxidants 1010 and 168, the combination of the PKGs 906 and 1010 and the combination of the PKGs 906 and 168 are easy to yellow and have poor color, which indicates that in the application, the thio-type bisphenol antioxidant, the hindered phenol antioxidant and the phosphite antioxidant act together and are all not acceptable.
It can be seen from the examples in table 4 that when the blending ratio of the high melt index LDPE to the low melt index LDPE is moderate, the mechanical strength and toughness suitable for the soft cap can be obtained. Too low mechanical strength can cause the soft cover to be damaged in the plugging and unplugging process, and too high mechanical strength can have the defects of low softness, low transparency and the like. Meanwhile, the higher melt index can ensure the smooth molding of the material; on the basis, by adding proper elastomer, lubricant and antioxidant, the softness and transmittance of the material can be comprehensively improved and the color L value can be reduced while the mechanical property of the material is ensured.
In a word, the low-density polyethylene material obtained by the invention has the characteristics of high fluidity, super softness (Shore D is less than or equal to 35), high transparency (light transmittance is more than or equal to 85 percent), and good color (color L value is less than or equal to 6.5), and is suitable for manufacturing soft caps, especially hollow bottle soft caps.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The low-density polyethylene material is characterized by comprising the following components in parts by weight: 55-70 parts of low-flow LDPE, 10-20 parts of high-flow LDPE, 15-30 parts of POE, 0.5-1 part of lubricant and 0.1-0.75 part of antioxidant.
2. The low density polyethylene material according to claim 1, comprising the following components in parts by weight: 60-65 parts of low-flow LDPE, 13-18 parts of high-flow LDPE, 20-25 parts of POE, 0.6-0.8 part of lubricant and 0.2-0.45 part of antioxidant.
3. The low-density polyethylene material according to claim 1 or 2, characterized by comprising at least one of the following (a) to (c):
(a) the low flow LDPE has a melt index of 1-3g/10min at 190 ℃ under 2.16kg test conditions;
(b) the melt index of the high flow LDPE at 190 ℃ under the test condition of 2.16kg is 45-70g/10 min;
(c) the POE is an ethylene-octene copolymer, and the melt index is 3-10g/10min under the test conditions of 190 ℃ and 2.16 kg.
4. The low density polyethylene material according to claim 1 or 2, characterized by comprising at least one of the following (a) and (b):
(a) the lubricant is an external lubricant;
(b) the antioxidant is a compound of a thio-bisphenol antioxidant, a hindered phenol antioxidant and a phosphite antioxidant.
5. The low-density polyethylene material as claimed in claim 4, wherein the mass ratio of the thio-bisphenol antioxidant to the hindered phenol antioxidant to the phosphite antioxidant is (1-2): (1-2): (1-2).
6. The low density polyethylene material according to claim 4, wherein the thio-type bisphenol antioxidant is selected from the group consisting of 4,4' -thiobis (6-tert-butyl-3-methylphenol); the hindered phenol antioxidant is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester; the phosphite antioxidant is tris (2, 4-di-tert-butylphenyl) phosphite.
7. The low density polyethylene material according to claim 4, wherein the lubricant is an amide-based lubricant.
8. A process for the preparation of a low density polyethylene material as claimed in any one of claims 1 to 7, comprising the steps of: mixing low-flow LDPE, high-flow LDPE and POE, adding an antioxidant and a lubricant, mixing again, extruding and granulating to obtain a low-density polyethylene material;
the extrusion adopts a filtering type single-screw extruder, the diameter is 150mm, the extrusion temperature is 150 ℃ and 180 ℃, and the screw rotating speed is 450 ℃ and 550 HZ.
9. The method for preparing low density polyethylene material according to claim 8, wherein the low flow LDPE, high flow LDPE, POE has a pellet length, width and height of 3-5 mm.
10. Use of the low density polyethylene material according to any one of claims 1 to 7 in the manufacture of a soft cap.
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