CN116023729A - Special master batch for PE white film and preparation method thereof - Google Patents
Special master batch for PE white film and preparation method thereof Download PDFInfo
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- 239000004594 Masterbatch (MB) Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000004698 Polyethylene Substances 0.000 claims abstract description 93
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 53
- 238000004383 yellowing Methods 0.000 claims abstract description 31
- 229920001684 low density polyethylene Polymers 0.000 claims abstract description 29
- 239000004702 low-density polyethylene Substances 0.000 claims abstract description 29
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 24
- 229920000092 linear low density polyethylene Polymers 0.000 claims abstract description 23
- 239000004707 linear low-density polyethylene Substances 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 239000000314 lubricant Substances 0.000 claims abstract description 20
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 16
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 16
- -1 pentaerythritol tetra (3-laurylthiopropionic acid) ester Chemical class 0.000 claims abstract description 10
- 239000002250 absorbent Substances 0.000 claims abstract description 6
- 230000002745 absorbent Effects 0.000 claims abstract description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract 4
- 239000000463 material Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 10
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 7
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims description 4
- TXQVDVNAKHFQPP-UHFFFAOYSA-N [3-hydroxy-2,2-bis(hydroxymethyl)propyl] octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(CO)(CO)CO TXQVDVNAKHFQPP-UHFFFAOYSA-N 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims description 4
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 claims description 2
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical group OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 2
- 239000011347 resin Substances 0.000 abstract description 13
- 229920005989 resin Polymers 0.000 abstract description 13
- 239000011159 matrix material Substances 0.000 abstract description 9
- 239000001038 titanium pigment Substances 0.000 abstract description 9
- 239000012752 auxiliary agent Substances 0.000 abstract description 3
- 239000002861 polymer material Substances 0.000 abstract description 2
- 239000010408 film Substances 0.000 description 53
- 235000010215 titanium dioxide Nutrition 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 17
- 239000000843 powder Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000000203 mixture Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000012463 white pigment Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000010096 film blowing Methods 0.000 description 3
- 239000000049 pigment Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 239000004595 color masterbatch Substances 0.000 description 2
- 238000004040 coloring Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000000088 plastic resin Substances 0.000 description 2
- 239000013558 reference substance Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound 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 description 1
- VSVVZZQIUJXYQA-UHFFFAOYSA-N [3-(3-dodecylsulfanylpropanoyloxy)-2,2-bis(3-dodecylsulfanylpropanoyloxymethyl)propyl] 3-dodecylsulfanylpropanoate Chemical compound CCCCCCCCCCCCSCCC(=O)OCC(COC(=O)CCSCCCCCCCCCCCC)(COC(=O)CCSCCCCCCCCCCCC)COC(=O)CCSCCCCCCCCCCCC VSVVZZQIUJXYQA-UHFFFAOYSA-N 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 125000000524 functional group Chemical group 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- SSDSCDGVMJFTEQ-UHFFFAOYSA-N octadecyl 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 SSDSCDGVMJFTEQ-UHFFFAOYSA-N 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002985 plastic film Substances 0.000 description 1
- 229920006255 plastic film Polymers 0.000 description 1
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical compound O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention discloses a master batch special for a PE white film and a preparation method thereof, belonging to the technical field of high polymer materials. The product comprises the following components in parts by weight: 10-15 parts of LDPE, 9-14 parts of LLDPE, 70-75 parts of titanium dioxide, 1-4 parts of PE wax, 0.5-3 parts of lubricant, 0.2-2 parts of yellowing resistant agent, 0.1-1 part of antioxidant and 0.2-1 part of ultraviolet absorbent; the yellowing-resistant agent is pentaerythritol tetra (3-laurylthiopropionic acid) ester. The titanium pigment is loaded by a specific matrix resin and an auxiliary agent, so that the titanium pigment has high whiteness, good dispersibility, excellent yellowing resistance and long service life, and is very suitable for preparing PE white films.
Description
Technical Field
The invention relates to the technical field of high polymer materials, in particular to a masterbatch special for a PE white film and a preparation method thereof.
Background
The PE white film is a common plastic film, and is generally prepared by a film blowing method through processes of melting plasticization, extrusion, film blowing and the like of PE materials containing white pigment. The direct addition of pigment into PE material can result in uneven dispersion and low whiteness, so that most of the current processes take PE as carrier to load pigment to prepare white master batch, and then the master batch is put into PE material to be mixed and blown into film.
However, the use effect of the PE white master batch prepared by the prior art is not ideal, and the main reason is that the PE white master batch is generally prepared by directly dispersing and mixing PE and white pigment in parallel with the same raw materials such as a coupling agent, a stabilizer, a lubricant and the like, and then directly preparing the master batch in a screw extruder, wherein the composition of the master batch is unreasonable, and the prepared product has poor dispersibility, so that various problems such as insufficient whiteness, uneven color system, easy yellowing and the like are often caused. CN202011060370.6 discloses a general white master batch, which is prepared from carrier resin, titanium pigment, dispersant, antioxidant and desilication powder, but the pigment proportion of the product is too low, so that the whiteness of the product is insufficient under normal addition, and meanwhile, the desilication powder contained in the product also reduces the surface gloss of the coloring material, so that the product is not suitable for film products. CN202111246501.4 discloses a high-whiteness PE white master batch, the proportion of titanium pigment in the master batch is higher, the whiteness is higher, but relatively speaking, the titanium pigment is difficult to disperse in matrix resin in the preparation process, broken strips are easy to appear in the extrusion molding process, the production is affected, the wettability and the wrapping property of the PE resin of the obtained product are poor, the powder falling off phenomenon in the vibration screening process is serious, the dispersibility is poor, and the high-whiteness PE white master batch is also not suitable for film products.
Disclosure of Invention
Based on the defects existing in the prior art, the invention aims to provide the special master batch for the PE white film, and the special master batch is prepared by loading titanium pigment with specific matrix resin and auxiliary agent, has high whiteness, good dispersibility, excellent yellowing resistance and long service life, and is very suitable for preparing the PE white film.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a special masterbatch for PE white film comprises the following components in parts by weight:
10-15 parts of LDPE, 9-14 parts of LLDPE, 70-75 parts of titanium dioxide, 1-4 parts of PE wax, 0.5-3 parts of lubricant, 0.2-2 parts of yellowing resistant agent, 0.1-1 part of antioxidant and 0.2-1 part of ultraviolet absorbent; the yellowing-resistant agent is pentaerythritol tetra (3-laurylthiopropionic acid) ester.
In the field of PE white films, the whiteness of the finally prepared product can be increased as the special white pigment master batch is not added more, mainly because the saturation condition exists in the addition of the white pigment master batch, and the saturation value can be increased only by increasing the dispersibility of the master batch under the condition of certain whiteness of the master batch, so that the whiteness of the product is increased. In the components of the special master batch for PE white film, in order to ensure the initial whiteness of the product, high-content titanium dioxide is used, and simultaneously, two high-fluidity resins with different tackiness of LDPE (low density polyethylene) and LLDPE (linear low density polyethylene) are introduced to infiltrate and disperse the titanium dioxide, so that the dispersion saturation value of the product is improved. And secondly, the PE wax in the components has good compatibility with PE resin and good fluidity, and can cooperate with a lubricant to further improve the wettability and coating degree of the matrix resin on the titanium pigment. On the other hand, pentaerythritol tetra (3-laurylthiopropionic acid) ester is introduced into the components of the product as a yellowing-resistant agent, and contains a plurality of specific functional groups, so that the high titanium white powder content and high fluidity resin matrix system has more efficient anti-aging and yellowing-resistant effects compared with other common yellowing-resistant agents, and the product has longer service life.
Preferably, the filter pressing value of the special master batch for the PE white film is less than or equal to 15bar according to BS-EN 13900-5.
More preferably, the method for testing the filter pressing value of the master batch special for the PE white film comprises the following steps: mixing the special master batch for the PE white film with LDPE, and detecting a filter pressing value of the obtained mixture by adopting a color master batch disperser and a 1400-mesh filter screen; the mass ratio of the special master batch for the PE white film to the LDPE is 0.08:1.
As described above, the prior art does not pay much attention to the dispersibility of the master batch itself, but the dispersibility of the master batch is not simply considered to be as good as the smaller the particle diameter thereof. In order to confirm the dispersibility of the special masterbatch for the PE white film, the inventor characterizes the dispersibility by a filter pressing value, and when the filter pressing value is lower, the dispersibility of the special masterbatch for the PE white film in plastics such as LDPE and the like is better, and the uniformity is better after the special masterbatch for the PE white film is prepared into the white film.
Preferably, the LDPE has a melt index of 20 to 60g/10min at 190℃under a load of 2.16kg according to GB/T3682.1-2018.
Preferably, the LLDPE has a melt index of 10 to 40g/10min at 190℃under a load of 2.16kg according to GB/T3682.1-2018.
Preferably, the titanium dioxide is rutile titanium dioxide prepared by a chlorination method.
The rutile type titanium dioxide prepared by the chloridizing method has less impurities, high initial whiteness and better coloring effect compared with other crystal forms such as anatase type titanium dioxide.
Preferably, the PE wax has an average molecular weight of 1000 to 3000.
Preferably, the lubricant is at least one of erucamide and pentaerythritol stearate.
More preferably, the lubricant is a mixture of erucamide and pentaerythritol stearate.
Preferably, the antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and the ultraviolet absorber is UV-531.
The invention also aims to provide a preparation method of the special master batch for the PE white film, which comprises the following steps:
(1) Mixing and dispersing titanium dioxide, PE wax and a lubricant in a high-speed mixer I at a speed of 800-1000 rpm to obtain a material A;
(2) Mixing and dispersing LDPE, LLDPE, yellowing resistant agent, antioxidant and ultraviolet absorbent in a stirrer II at a speed of 40-120 rpm to obtain a material B;
(3) And (3) respectively adding the material A and the material B into a double-screw extruder by adopting a double-discharging pipeline and a double-weightless type feeding machine, and then sequentially plasticizing and dispersing, extruding a brace, water-cooling and air-drying, granulating and homogenizing to obtain the special master batch for the PE white film.
In the preparation method of the special master batch for the PE white film, the titanium dioxide, the PE wax and the lubricant are soaked and dispersed at a high speed in advance by adopting a material step-by-step premixing mode, so that the problems of uneven powder stirring and sedimentation and layering of powder and resin matrix particles caused by direct mixing of the titanium dioxide and a plastic resin matrix are avoided. After titanium dioxide is fully and uniformly dispersed to form a material A, and plastic resin matrixes such as LDPE, LLDPE and the like are mixed with components such as yellowing resistant agents and the like to form a material B, the materials B and the materials B are respectively fed through a double-feeding pipeline and a double-weightless feeding machine, the problems that powder such as titanium dioxide in a traditional feeding pipeline is prone to layering and sedimentation and uneven in feeding are effectively solved, two materials can be accurately fed, and meanwhile, the prepared product has uniform quality.
Preferably, the temperature of the twin screw extruder is set to: first area 90-120 deg.c, second area 140-150 deg.c, third area 165-170 deg.c, fourth area 175-180 deg.c, fifth area 175-180 deg.c, sixth area 175-180 deg.c, seventh area 165-170 deg.c, eighth area 165-170 deg.c, ninth area 165-170 deg.c, and tenth area 165-170 deg.c.
In the twin-screw extruder, the front temperature zone is the feeding zone, while the three zones are compacted and plasticized, and the four to six zones belong to the melting mixing and exhausting zone, so that the temperature of the part of the zones is not too high or too low, and partial material decomposition or uneven material dispersion is avoided.
Preferably, the screw speed of the twin-screw extruder is 200-250 rpm.
The screw rotating speed of the double-screw extruder is set in the range, so that proper shearing strength can be ensured, the dispersibility of materials is ensured, and meanwhile, excessive heat cannot be generated to decompose the materials.
The invention also aims to provide an application of the special master batch for the PE white film in preparing the PE white film.
The master batch special for the PE white film has high dispersibility, high initial whiteness, strong aging resistance, long-acting yellowing resistance, high whiteness and high covering effect after being mixed with PE resin and blown into a film to prepare the white film, high glossiness and stability of the product, and long service life.
The invention has the beneficial effects that the special master batch for the PE white film is provided, and the special matrix resin is matched with the auxiliary agent to load the titanium pigment, so that the product has high whiteness, good dispersibility, excellent yellowing resistance and long service life, and is very suitable for preparing the PE white film.
Detailed Description
The present invention will be further described with reference to specific examples and comparative examples for better illustrating the objects, technical solutions and advantages of the present invention, and the object of the present invention is to be understood in detail, not to limit the present invention. All other embodiments, which can be made by those skilled in the art without the inventive effort, are intended to be within the scope of the present invention. The experimental reagents and instruments involved in the practice of the present invention are common reagents and instruments unless otherwise specified.
Example 1
The special master batch for the PE white film comprises the following components in parts by weight:
13 parts of LDPE, 11 parts of LLDPE, 70 parts of titanium dioxide, 2 parts of PE wax, 2 parts of lubricant, 0.6 part of yellowing resistant agent, 0.3 part of antioxidant and 0.5 part of ultraviolet absorber;
the LDPE is a Yanshan petrochemical LD450, and the melt index of the LDPE under the load of 2.16kg at 190 ℃ according to GB/T3682.1-2018 is 45g/10min;
the LLDPE is medium petrochemical 7144 powder, and the melt index of the LLDPE at 190 ℃ under the load of 2.16kg according to GB/T3682.1-2018 is 20g/10min;
the titanium dioxide is rutile titanium dioxide prepared by a commercial chlorination method;
the PE wax has an average molecular weight of 2000;
the lubricant is a mixture of commercially available erucamide and pentaerythritol stearate according to a mass ratio of 1:1;
the yellowing-resistant agent is pentaerythritol tetra (3-laurylthiopropionic acid) ester sold in the market;
the antioxidant is commercial tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester;
the ultraviolet absorber is commercial UV-531.
The preparation method of the master batch special for the PE white film comprises the following steps:
(1) Mixing and dispersing titanium dioxide, PE wax and a lubricant in a high-speed mixer I at a speed of 900rpm to obtain a material A;
(2) Mixing and dispersing LDPE, LLDPE, yellowing resistant agent, antioxidant and ultraviolet absorbent in a stirrer II at a speed of 80rpm to obtain a material B;
(3) Respectively adding a material A and a material B into a double-screw extruder by adopting a double-discharging pipeline and a double-weightless type feeding machine, and sequentially plasticizing and dispersing, extruding a brace, water-cooling and air-drying, granulating and homogenizing to obtain the special master batch for the PE white film;
the temperature of the twin-screw extruder is set as follows: first area 90-120 deg.c, second area 140-150 deg.c, third area 165-170 deg.c, fourth area 175-180 deg.c, fifth area 175-180 deg.c, sixth area 175-180 deg.c, seventh area 165-170 deg.c, eighth area 165-170 deg.c, ninth area 165-170 deg.c, and tenth area 165-170 deg.c;
the screw rotating speed of the double screw extruder is 200-250 rpm.
Example 2
The embodiment of the special master batch for the PE white film and the preparation method thereof disclosed by the invention only has the difference from the embodiment 1 in that the special master batch for the PE white film comprises the following components in parts by weight:
10 parts of LDPE, 9 parts of LLDPE, 75 parts of titanium dioxide, 2 parts of PE wax, 2 parts of lubricant, 0.6 part of yellowing resistant agent, 0.3 part of antioxidant and 0.5 part of ultraviolet absorber.
Example 3
The embodiment of the special master batch for the PE white film and the preparation method thereof disclosed by the invention only has the difference from the embodiment 1 in that the special master batch for the PE white film comprises the following components in parts by weight:
10 parts of LDPE, 14 parts of LLDPE, 70 parts of titanium dioxide, 2 parts of PE wax, 2 parts of lubricant, 0.6 part of yellowing resistant agent, 0.3 part of antioxidant and 0.5 part of ultraviolet absorber.
Comparative example 1
The special master batch for the PE white film and the preparation method thereof only differ from the embodiment 1 in that the special master batch for the PE white film comprises the following components in parts by weight:
13 parts of LDPE, 11 parts of LLDPE, 70 parts of titanium dioxide, 2 parts of PE wax, 2 parts of lubricant, 0.9 part of yellowing resistant agent and 0.5 part of ultraviolet absorber.
Comparative example 2
The special master batch for the PE white film comprises the following components in parts by weight:
13 parts of LDPE, 11 parts of LLDPE, 70 parts of titanium pigment, 2 parts of PE wax, 2 parts of lubricant, 0.9 part of antioxidant and 0.5 part of ultraviolet absorber.
Comparative example 3
The difference between this comparative example and example 1 is only that the yellowing-resistant agent is replaced by tris (2, 4-di-tert-butylphenyl) phosphite from pentaerythritol tetrakis (3-laurylthiopropionic acid) ester.
Comparative example 4
The only difference between this comparative example and example 1 is that the yellowing resistance agent is replaced by stearyl β - (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate from pentaerythritol tetrakis (3-laurylthiopropionate).
Comparative example 5
The special master batch for the PE white film and the preparation method thereof only differ from the embodiment 1 in that the special master batch for the PE white film comprises the following components in parts by weight:
5 parts of LDPE, 19 parts of LLDPE, 70 parts of titanium dioxide, 2 parts of PE wax, 2 parts of lubricant, 0.6 part of yellowing resistant agent, 0.3 part of antioxidant and 0.5 part of ultraviolet absorber.
Comparative example 6
The special master batch for the PE white film and the preparation method thereof only differ from the embodiment 1 in that the special master batch for the PE white film comprises the following components in parts by weight:
19 parts of LDPE, 5 parts of LLDPE, 70 parts of titanium dioxide, 2 parts of PE wax, 2 parts of lubricant, 0.6 part of yellowing resistant agent, 0.3 part of antioxidant and 0.5 part of ultraviolet absorber.
Comparative example 7
The difference between this comparative example and example 1 is only that the LDPE (LD 450) is replaced by LDPE (1F 7B) having a melt index of 7g/10min at 190℃under a load of 2.16kg according to GB/T3682.1-2018.
Comparative example 8
The difference between this comparative example and example 1 is only that the LLDPE (7144 powder) was replaced by LLDPE (7042) and that the melt index according to GB/T3682.1-2018 at 190℃under a load of 2.16kg was 2g/10min.
Comparative example 9
The comparative example differs from example 1 only in that the preparation method of the master batch special for PE white film comprises the following steps:
(1) Mixing and dispersing the components in a high-speed mixer I at a speed of 900rpm to obtain a material A;
(2) And (3) adding the material A into a double-screw extruder by adopting a single blanking pipeline and a weightless type feeding machine, and then sequentially carrying out plasticization and dispersion, extrusion bracing, water-cooling and air-drying, granulating and homogenization to obtain the special master batch for the PE white film.
Effect example
In order to verify the use effect of the special master batch for PE white films, the products of each example and the comparative example are added into LDPE (1F 7B) (with the melt index of 7g/10 min) according to the addition amount of 5 weight percent, and then the mixture is processed, and a PE white film with the thickness of 0.025mm is prepared by adopting a film blowing machine, and the initial Lab value of the product is tested by adopting a color difference meter according to CIE 2000 test standard, and the light transmittance of the product is tested; and then placing the product in an 80 ℃ oven at normal pressure and constant temperature for 168 hours, taking out, testing the Lab value of the product by adopting the same method, and calculating the color difference delta E of the product before and after aging by adopting the Lab value before and after placing.
According to BS-EN13900-5, uniformly mixing the special master batch for the PE white film with LDPE (1F 7B), and detecting a filter pressing value of the obtained mixture by adopting a color master batch disperser and a 1400-mesh filter screen; the mass ratio of the special master batch for the PE white film to the LDPE is 8:92.
The melt index of each product was tested according to GB/T3682.1-2018.
Meanwhile, in order to conveniently compare the existing products, commercial PE white master batches A and B (the content of titanium dioxide is about 70 wt%) produced by Changzhou A company and Dongguan B company with higher industry evaluation are used as reference substances 1 and 2 to carry out the same test, and the test results of each product and reference substance are shown in Table 1.
TABLE 1
As can be seen from Table 1, the special master batch for PE white film has higher initial whiteness, low yellowness and good product dispersibility, and can endow the product with good yellowing resistance and color uniformity when being applied to preparing PE white film, and the prepared PE white film has low light transmittance and far better use effect than the control products 1 and 2 of the prior commercial master batch. In the product disclosed by the invention, the use of the yellowing-resistant agent has a great influence on the yellowing resistance of the product, and the lack of the component or the non-preferential replacement of the component can lead to the color difference of the product after the yellowing-resistant aging treatment to be large. The titanium dioxide content in the product components is high, and in order to ensure the dispersibility of the prepared special master batch for the PE white film, LDPE and LLDPE with specific proportions are matched to be used as matrix resin. In contrast, the choice of components or the preparation process of each comparative example product is not within the scope of the present invention, and the obtained master batch product is difficult to achieve the technical effects expected to be similar to those of the example product.
Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted equally without departing from the spirit and scope of the technical solution of the present invention.
Claims (10)
1. The special master batch for the PE white film is characterized by comprising the following components in parts by weight:
10-15 parts of LDPE, 9-14 parts of LLDPE, 70-75 parts of titanium dioxide, 1-4 parts of PE wax, 0.5-3 parts of lubricant, 0.2-2 parts of yellowing resistant agent, 0.1-1 part of antioxidant and 0.2-1 part of ultraviolet absorbent; the yellowing-resistant agent is pentaerythritol tetra (3-laurylthiopropionic acid) ester.
2. The special master batch for PE white films according to claim 1, wherein the filter pressing value of the special master batch for PE white films is less than or equal to 15bar according to BS-EN 13900-5.
3. The special masterbatch for PE white film according to claim 1, characterized in that the melt index of LDPE according to GB/T3682.1-2018 is 20-60 g/10min at 190 ℃ under a load of 2.16 kg.
4. The PE white film special master batch according to claim 1, wherein the LLDPE has a melt index of 10-40 g/10min at 190℃under a load of 2.16kg according to GB/T3682.1-2018.
5. The special master batch for PE white film according to claim 1, wherein the average molecular weight of the PE wax is 1000-3000.
6. The PE white film-specific master batch according to claim 1, wherein the lubricant is at least one of erucamide and pentaerythritol stearate.
7. The special master batch for PE white film according to claim 1, wherein the antioxidant is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and the ultraviolet absorber is UV-531.
8. The method for preparing the special master batch for the PE white film according to any one of claims 1 to 7, which is characterized by comprising the following steps:
(1) Mixing and dispersing titanium dioxide, PE wax and a lubricant in a high-speed mixer I at a speed of 800-1000 rpm to obtain a material A;
(2) Mixing and dispersing LDPE, LLDPE, yellowing resistant agent, antioxidant and ultraviolet absorbent in a stirrer II at a speed of 40-120 rpm to obtain a material B;
(3) And (3) respectively adding the material A and the material B into a double-screw extruder by adopting a double-discharging pipeline and a double-weightless type feeding machine, and then sequentially plasticizing and dispersing, extruding a brace, water-cooling and air-drying, granulating and homogenizing to obtain the special master batch for the PE white film.
9. The method for preparing a master batch special for a PE white film according to claim 8, wherein the temperature of the twin-screw extruder is set as follows: first area 90-120 deg.c, second area 140-150 deg.c, third area 165-170 deg.c, fourth area 175-180 deg.c, fifth area 175-180 deg.c, sixth area 175-180 deg.c, seventh area 165-170 deg.c, eighth area 165-170 deg.c, ninth area 165-170 deg.c, and tenth area 165-170 deg.c; the screw rotating speed of the double screw extruder is 200-250 rpm.
10. Use of a masterbatch for PE white film according to any one of claims 1 to 7 for the preparation of PE white film.
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