CN113861567A - Modified polypropylene zipper material for liquid packaging and preparation method thereof - Google Patents
Modified polypropylene zipper material for liquid packaging and preparation method thereof Download PDFInfo
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- CN113861567A CN113861567A CN202111150462.8A CN202111150462A CN113861567A CN 113861567 A CN113861567 A CN 113861567A CN 202111150462 A CN202111150462 A CN 202111150462A CN 113861567 A CN113861567 A CN 113861567A
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- 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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
- C08L23/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
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- 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
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- 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
- C08L2205/24—Crystallisation aids
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- 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
- C08L2207/10—Peculiar tacticity
- C08L2207/14—Amorphous or atactic polypropylene
Abstract
The invention discloses a modified polypropylene zipper material for liquid packaging and a preparation method thereof. The formula comprises the following components: 50-70 parts of polypropylene I, 30-50 parts of toughened elastomer, 2-10 parts of nucleating smooth master batch, 0.05-0.1 part of antioxidant and 0-0.1 part of composite light stabilizer; wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts by weight; the nucleated smooth master batch comprises: polypropylene II, inorganic silicon dioxide, a nucleating agent and a slipping agent, wherein the mass ratio of the polypropylene II to the inorganic silicon dioxide is (85-90): 5: (2.5-5): (2.5-5). The modified polypropylene zipper material disclosed by the invention realizes the waterproof effect of the PP zipper, improves the performance of easy brittle fracture, low-temperature freezing resistance and high-temperature boiling resistance of the PP zipper, and reduces the production energy consumption of the zipper by about 50%.
Description
Technical Field
The invention relates to the field of zipper composite bags, in particular to a modified polypropylene zipper material for liquid packaging and a preparation method thereof.
Background
The zipper composite bag is a product which has a compact seal, prevents air from continuously entering the inner bag and is easy and convenient to operate. The zipper materials used in the commercially available zipper compound bags are typically polyethylene, polypropylene and EVA (ethylene-vinyl acetate copolymer). Generally, a welding process is adopted, the welding performance of different materials is considered, and corresponding zipper materials are selected according to the material of the composite bag for matching. For liquid packaging, because the PE zipper has good heat-sealing property with the film, is flexible, and can achieve liquid sealing by technical means, see patent application CN109575407A "a film zipper production formula and flow chart". However, PE materials also have their limitations, such as resistance to radiation sterilization, taste, retort resistance, etc.; in order to satisfy this type of application, can use the bag body of PP material, however, the PP material bag body can't weld with the PE zip fastener, and the PP zip fastener of current use can not play waterproof effect owing to the material is hard partially, elasticity inadequately, can only be used for the encapsulation of some solid products.
The zipper material of the existing zipper composite bag has the following technical problems:
1) the PE zipper can prevent water, but cannot be welded with the PP bag body;
2) the modified PE zipper material can be welded with a PP bag body, but the PE zipper material cannot avoid the smell generated after irradiation, cannot resist high-temperature cooking and can deform after cooking;
3) the PE zipper material has poor transparency, and cannot meet the appearance requirement of products with transparency requirements;
4) the PP zipper has higher hardness and insufficient elasticity, cannot play a waterproof role, and can only be used for packaging some solid products;
5) the PP zipper material has higher energy consumption compared with the PE material;
6) the PP zipper material has large shrinkage rate, and a zipper framework is easy to form shrinkage pits and be not full;
7) the PP zipper is easy to stretch due to high heat sealing temperature, the flatness of a heat sealing part is difficult to maintain after the PP zipper is sealed with a PP bag body, and the part sealed with the bag body is easy to have a local delaminating phenomenon;
8) the PP zipper material is brittle, easy to break after being bent, and not resistant to low temperature and freezing.
Disclosure of Invention
In order to solve at least one technical problem, the invention provides a modified polypropylene zipper material for liquid packaging and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a modified polypropylene zipper material for liquid packaging, which comprises the following components in part by weight:
50-70 parts by weight of polypropylene I,
30-50 parts by weight of toughening elastomer,
2-10 parts by weight of nucleation slipping master batch,
0.05-0.1 parts by weight of an antioxidant, and
0-0.1 part by weight of a composite light stabilizer;
wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts by weight;
the nucleated smooth master batch comprises: polypropylene II, inorganic silicon dioxide, a nucleating agent and a slipping agent, wherein the mass ratio of the polypropylene II to the inorganic silicon dioxide is (85-90): 5: (2.5-5): (2.5-5), e.g., 90:5:2.5:2.5, 85:5:5: 5.
In the nucleated slip masterbatch, it is further preferred that the slip agent is selected from one or a combination of erucamide, oleamide.
The nucleating smooth master batches are added, so that the polypropylene zipper material is prevented from being too soft and stiff, the smoothness of the surface of the zipper is ensured, the zipper can be smoothly pulled by a traction mechanism on a bag making machine, and otherwise the zipper is difficult to pull due to puckery texture, so that the bag making efficiency is influenced.
In the nucleating smooth master batch, further preferably, the nucleating agent is a phosphate transparent nucleating agent; more preferably, the phosphate-based transparent nucleating agent is a phosphate-based nucleating agent NA-21(2,2' -methylene-bis (4, 6-di-tert-butylphenyl phosphoric acid) aluminum hydroxide).
In the nucleated and smooth master batch, it is further preferable that the polypropylene II is binary or ternary random copolymer polypropylene, such as ethylene propylene binary copolymer polypropylene, and the melting point is about 140 ℃ so as to maintain the melting point close to that of the base material polypropylene I.
In the nucleating smooth master batch, the particle size of the inorganic silicon dioxide is more preferably 3-6 μm.
According to the modified polypropylene zipper material, in order to ensure the welding effect, the polypropylene I is random copolymer polypropylene, and the copolymer monomers of the polypropylene I comprise 86-98 wt.% of propylene, 2-8 wt.% of ethylene and 0-6% of butylene.
The DSC melting peak of the modified polypropylene zipper designed by the invention has a unimodal or bimodal structure, the melting point of unimodal polypropylene is as low as possible, and the bimodal polypropylene does not need to consider the limitation, because the bimodal modified polypropylene material has a wider welding range, the design is to realize lower welding temperature and better welding effect with a PP bag body, reduce energy consumption in the production process, ensure the flatness of a sealing part with the PP bag body and avoid the local delamination phenomenon of the sealing part with the bag body.
Further preferred according to the invention is that the polypropylene I is a unimodal low melting polypropylene or a bimodal polypropylene. The single peak and the double peaks refer to DSC melting peaks, and the low melting point refers to the melting point of polypropylene of 127-139 ℃.
According to the modified polypropylene zipper material, in order to ensure the processing and forming rate of the zipper and the integrity of the framework, the melt index of the designed modified polypropylene zipper material is relatively high but cannot be too high, and is between (10 and 30) g/10min, the relatively high melt index of the polypropylene zipper material, the better fluidity ensures the lower melt viscosity of the zipper material in extrusion equipment, the forming speed of the zipper can be improved, the better plasticizing effect of the material in the equipment can be obtained, the melt can be ensured to fully enter the neck mold, and the zipper framework can be formed more fully and completely. Correspondingly, the melt index of the polypropylene I is preferably (12-25) g/10 min. The conditions for measuring the melt index in the present invention were 230 ℃ and 2.16kg pressure.
In the invention, the toughening elastomer is used for reducing the hardness of the framework zipper and increasing the elasticity, and when the upper strand chain and the lower strand chain of the framework zipper are embedded and sealed, enough elasticity can be generated, so that the teeth buttons of the upper strand chain and the lower strand chain can realize elastic sealing, thus completely locking liquid and avoiding leakage generated by hard connection gaps between the teeth buttons.
In a preferred embodiment, 30 to 50 parts by weight of the toughened elastomer comprises: 20-30 parts by weight of a styrenic thermoplastic elastomer and 10-20 parts by weight of a propylene-based elastomer; the sum of the two components ensures that the toughening elastomer accounts for 30 to 50 weight parts.
More preferably, the toughening elastomer is formed by compounding 20-30 parts by weight of styrene thermoplastic elastomer and 10-20 parts by weight of propylene-based elastomer, so that the hardness of the zipper can be reduced, the stiffness of the zipper can be ensured, better elasticity is realized, and liquid sealing is realized.
In the toughened elastomer of the present invention, preferably, the styrenic thermoplastic elastomer is selected from one or a combination of two or more of styrene/butadiene/styrene block copolymer (SEBS), styrene/butadiene/styrene hydrogenated block copolymer, styrene/isoprene/styrene hydrogenated block copolymer, styrene/hexene-butene/styrene block copolymer, and styrene/ethylene-propylene/styrene block copolymer.
In the toughened elastomer of the present invention, preferably, the propylene-based elastomer is selected from one or a combination of two or more of an ethylene propylene copolymer, a propylene butene copolymer, and a propylene octene copolymer.
According to the invention, the shrinkage rate of the polypropylene zipper material can be reduced to 1.2% by adding the toughening elastomer and the transparent nucleating agent, so that the framework zippers can be fully buckled, the leakage of gaps between the teeth buttons caused by overlarge shrinkage rate is avoided, and the polypropylene zipper material has better transparency and is suitable for products with better appearance quality requirements.
According to the modified polypropylene zipper material, preferably, the antioxidant is a multi-element hindered phenol type and a phosphite compound type; for example, the antioxidant 1010 is compounded with the antioxidant 168, the antioxidant 1010 is tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, and the antioxidant 168 is tris [2, 4-di-tert-butylphenyl ] phosphite.
According to the modified polypropylene zipper material of the present invention, preferably, the composite light stabilizer is a hindered amine type. For example, a hindered amine light stabilizer HS-944 (CAS: 70624-18-9, poly { [6- [ (1,1,3, 3-tetramethylbutyl) amino ] ] -1,3, 5-triazine-2, 4- [ (2,2,6, 6-tetramethyl-piperidyl) imino ] -1, 6-hexamethylene [ (2,2,6, 6-tetramethyl-4-piperidyl) imino ] }), hindered amine light stabilizer HS-765 (CAS: 82919-37-7, hindered amine light stabilizer HS-508(292) mixture of bis (1,2,2,6, 6-pentamethyl-4-piperidine) sebacate and 1- (methyl) -8- (1,2,2,6, 6-pentamethyl-4-piperidine) sebacate).
The invention also provides a preparation method of the modified polypropylene zipper material for liquid packaging, which comprises the following steps:
preparing the nucleating smooth master batch:
adding the polypropylene II, the inorganic silicon dioxide, the nucleating agent and the slipping agent into a high-speed mixer in sequence, fully and uniformly mixing, adding into a double-screw extruder, and carrying out water-cooling, bracing and granulating to obtain the nucleating slipping master batch;
preparing a modified polypropylene zipper material:
and mixing the polypropylene I, the toughened elastomer, the nucleated smooth master batch, the antioxidant and the composite light stabilizer, adding the mixture into an extruder, or feeding the mixture into the extruder according to a proportion, extruding, cooling with water, drying and granulating to obtain the modified polypropylene zipper material.
According to the preparation method of the invention, preferably, in the preparation process of the nucleated and smooth master batch, the temperature of water-cooling strand cutting and grain cutting is 180-200 ℃, and the screw rotating speed of the double-screw extruder is not more than 280 rpm.
According to the preparation method of the present invention, preferably, the extrusion temperature is 160-200 ℃ and the extrusion speed does not exceed 300rpm low torque speed during the preparation of the modified polypropylene zipper material.
The beneficial effects of the invention include:
1) the waterproof effect of the PP zipper is realized.
According to the invention, through the formula design, the stiffness of the polypropylene zipper material is kept, and meanwhile, the polypropylene zipper material has good elasticity, when the upper strand chain and the lower strand chain of the framework zipper are embedded and sealed, the polypropylene zipper material can generate enough elasticity, so that the tooth buckles of the upper strand chain and the lower strand chain can realize elastic sealing, liquid can be completely locked, and the leakage caused by a hard connection gap between the tooth buckles is avoided.
2) The performance of easy brittle fracture and low-temperature freezing intolerance of PP is improved.
According to the invention, through the formula design, the styrene thermoplastic elastomer and the propylene-based elastomer are selected and compounded to the PP for toughening, so that the PP has higher room-temperature impact strength and low-temperature impact strength, and low-temperature freezing storage is realized.
3) The formula completely adopts PP material, styrene thermoplastic elastomer and propenyl elastomer, avoids using PE material, and simultaneously adopts hindered amine composite light stabilizer to ensure the stability of PP irradiation.
The PE can be degraded after being irradiated to generate volatile gases such as aldehydes and aldehydic acids, and the volatile gases have very strong odor, are unsafe and influence the odor and taste of food; the PP base material can not generate the substances, and in addition, the hindered amine composite light stabilizer can improve the irradiation resistance of PP.
4) The zipper material formula is designed into a high-melt-index (melt index) low-melting-point unimodal or bimodal material, so that the production energy consumption of the zipper can be reduced by about 50%.
The better fluidity ensures the lower melt viscosity of the zipper material in the extrusion equipment, can improve the forming speed of the zipper, is beneficial to obtaining better plasticizing effect of the material in the equipment, ensures that the melt fully enters the neck mold, and ensures that the zipper framework is formed more fully and completely. The modified polypropylene material with the low melting point and the single peak or the double peaks can reduce the welding temperature and the better welding effect of the zipper and the PP bag body, and ensure the flatness of the sealing part of the PP bag body, particularly the welding of the nonlinear part, thereby reducing the energy consumption in the production process by about 50 percent, avoiding the local delaminating phenomenon of the sealing part of the bag body and avoiding the liquid leakage.
5) The high-temperature boiling resistance of the PP zipper composite bag can be improved by utilizing the characteristics of PP.
The melting point of PP is above 135 ℃ and higher than that of HDPE (high density polyethylene) about 130 ℃, and the common zipper material adopts LDPE (low density polyethylene) and has the melting point of only about 115 ℃, so the PE composite zipper bag usually softens and deforms after being filled with hot water, but the PP composite zipper bag can contain hot water and receive a sterilization mode of high-temperature steaming.
The modified polypropylene zipper material for liquid packaging provided by the invention can be applied to zipper composite bags for liquid foods, infant and child products (such as milk storage bags) and medical reagent treatment composite bags.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below in connection with preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
All numerical designations of the invention (e.g., temperature, time, concentration, weight, and the like, including ranges for each) may generally be approximations that vary (+) or (-) in increments of 0.1 or 1.0 as appropriate. All numerical designations should be understood as preceded by the term "about".
Examples 1 and 2
Preparing the nucleated smooth master batch by adopting bracing and granulating, which comprises the following steps;
weighing erucamide or oleamide, inorganic silicon dioxide, nucleating agent and polypropylene according to the proportion. Wherein the grain diameter of the inorganic silicon dioxide is about 5 μm, the nucleating agent is phosphate nucleating agent NA-21, the polypropylene is ethylene propylene binary copolymer polypropylene, and the melting point is about 140 ℃, so as to maintain the melting point close to that of the base material. The specific raw material amounts are shown in Table 1 below.
Firstly, grinding polypropylene resin into powder by a grinder, then adding the powder into a high-speed mixer in the order of polypropylene, inorganic silicon dioxide, nucleating agent, erucamide or oleamide to be fully and uniformly mixed, adding the powder into a double-screw extruder to carry out water-cooling strand drawing and grain cutting, wherein the processing temperature is 180-200 ℃, the processing temperature is not more than 200 ℃, and the screw rotating speed is not more than 280rpm, so as to avoid the auxiliary fluid from being sprayed out at a neck mold, and prepare the nucleating smooth master batch.
TABLE 1 ingredients and amounts in nucleated slip concentrate
| Examples | Polypropylene/g | Inorganic silica/g | Nucleating agent/g | Oleic acid amide/g |
| 1 | 90 | 5 | 2.5 | 2.5 |
| 2 | 85 | 5 | 5 | 5 |
Examples 3 to 14
The preparation method of the modified polypropylene zipper material comprises the following steps:
sequentially adding polypropylene, a styrene elastomer, a propylene elastomer, a nucleating smooth master batch, an antioxidant and a light stabilizer into a color mixer, mixing for 3-5min, uniformly mixing, adding into an extruder, or feeding by using an automatic feeding system according to a proportion, extruding at a low torque speed of not more than 300rpm at the temperature of 160-200 ℃, cooling by water, drying, and pelletizing to obtain the modified polypropylene zipper material.
The formulation components and the amounts in each example are shown in the following table 2, and the polypropylene zipper material prepared in each example was used to prepare a zipper: and (3) putting the modified polypropylene zipper material into a feeding cylinder of a high-speed zipper extruder, melting at high temperature, extruding through an oral die, and naturally cooling and shaping for more than 12 hours to obtain the polypropylene zipper. The process temperature of the high-speed zipper extruder is set from one section to five sections to be 120 ℃, 160 ℃, 140 ℃ and 140 ℃.
The resulting modified polypropylene slide fastener was subjected to tests for hardness, melting point and impact strength, and the results are shown in Table 2. The tests were performed according to the following national standard documents: hardness, GB/T2411-.
In Table 2, the unimodal low-melting polypropylene is a random copolymer polypropylene, the melting point range is 127-139 ℃, and the melt index is 12-25g/10 min; the bimodal polypropylene is random copolymer polypropylene, the low peak melting point is between 130-139 ℃, the high peak melting point is between 145-152 ℃, and the melt index is 12-25g/10 min; the styrene elastomer is SEBS; the propylene-based elastomer is ethylene-propylene block copolymerization; the antioxidant is an antioxidant 1010/antioxidant 168, wherein the mass ratio is 1: 1; the composite light stabilizer is hindered amine type HS944: HS765 which is 1:2 (mass ratio).
Table 2 shows the results of the tests on the properties of the polypropylene slide fasteners obtained by using the formulation components and amounts (parts by weight) in examples 3 to 14
The unimodal polypropylene with the melting point below 140 ℃ or the bimodal polypropylene with the low temperature peak below 140 ℃ selected in the above embodiments 3-14, and the melt index is designed to be above 20g/10min, so that the process temperature of the zipper extrusion equipment can be set from one section to five sections to be 120 ℃, 160 ℃, 140 ℃ and 140 ℃, which is 30-40 ℃ lower than the extrusion temperature of common PE, such as 160 ℃, 165 ℃, 175 ℃, 180 ℃ and 180 ℃, thereby greatly saving the energy consumption of the equipment and reducing the energy consumption by about 50%. The hardness of the zipper is maintained between HD 45-62, the requirement of the stiffness of the zipper material can be met, the hardness is too low, the framework sealing does not have strength, the strength required by zipper buckling cannot be realized, and the leakage can be caused, while the hardness is too high, the elastic sealing of the zipper framework cannot be realized, and the leakage can also be caused by hard touch and hard buckling. The total content of toughening elastomer is therefore not more than 50% (based on 100% by weight of the total of polypropylene and toughening elastomer). The propylene-based elastomer can provide higher room-temperature impact strength (impact strength of not less than 30 KJ/m)2) And better low temperature impact strength, but too much propylene-based elastomer reduces the clarity and boil distortion resistance of the zipper material, and should be used in an amount of no more than 20% by comparison (based on 100% by weight of the total polypropylene and toughened elastomer). The inorganic silica affects the transparency, so the proportion should not exceed 0.25% (based on the total weight of the polypropylene and the toughened elastomer being 100%), the oleamide is a migration type slipping agent, which affects the welding effect of the zipper too much, so the inorganic silica is used in a composite way, the content is not more than 0.1% (based on the poly-siliconThe total weight of propylene and toughening elastomer is 100%). The transparent nucleating agent can improve the transparency of the zipper material, and the change of the transparency along with the content of the transparent nucleating agent is obvious only when the content is more than 0.05 percent, and the change of the transparency along with the content of the transparent nucleating agent becomes less obvious when the content is more than 0.1 percent, considering the cost, the content is not more than 0.1 percent (based on the total weight of the polypropylene and the toughened elastomer being 100 percent).
Comparative examples 1 to 10
The following comparative examples were prepared by the same procedure as in the above examples, and the specific formulations and properties of the resulting zipper materials, and the comparative results of the correspondingly prepared zippers are shown in the following table 3.
The process for preparing the zipper comprises the following steps:
and (3) putting the polypropylene zipper materials of the comparative examples 1-10 into a feeding cylinder of a high-speed zipper extruder, melting at high temperature, extruding through an oral die, and naturally cooling and shaping for more than 12 hours to obtain the polypropylene zipper. The process temperature of the high-speed zipper extruder is set from one section to five sections to be 120 ℃, 160 ℃, 140 ℃ and 140 ℃.
In Table 3, the unimodal high melting point polypropylene is random copolymerized polypropylene, the melting point is 148 ℃, and the melt index is 18g/10 min; the low-melting point means that PP is random copolymer polypropylene, the melting point is 130 ℃, and the melt index is 5.5g/10 min.
TABLE 3 formulation ingredients and amounts (parts by weight) in comparative examples 1 to 10, performance test results of the obtained polypropylene slide fastener, and comparative results
Compared with examples 7 and 8, the comparative example 1 has the advantages that when other polypropylene with the same performance but high melting point is used, the processing temperature for preparing the zipper is above 160 ℃, and the modified polypropylene material with the low melting point, single peak or double peaks can reduce the welding temperature of the zipper and the PP bag body, bring better welding effect, ensure the flatness of the sealing part of the PP bag body, particularly the welding of the nonlinear part, and further reduce the energy consumption in the production process by about 50 percent. Comparative example 2 compares with examples 7 and 8, and the use of polypropylene having the same properties but a low melt index makes zipper formation difficult, indicating that the use of polypropylene having a melt index too low results in zipper formation difficulty, and requires the use of polypropylene having a (12-25) g/10min as defined in the present invention. Comparative example 3 is inferior to example 3 in low temperature resistance when only one elastomer is used, and it is demonstrated that the low temperature resistance of the slide fastener can be secured by the combination of the styrenic thermoplastic elastomer and the propylene-based elastomer defined in the present invention. Comparative example 4 compares with example 3, when the propylene-based elastomer content is too high, the hardness exceeds 62; comparative example 5 in comparison with example 9, when the content of the acryl-based elastomer is too high, the zipper is whitened and the transparency is lowered; it is shown that in the elastomer combinations defined in the present invention, the propylene-based elastomer does not work well when the content is too high. Comparative example 6 is compared with example 13, when the content of the nucleating agent is too high, the transparency effect is not further improved, and the nucleating agent is expensive, but rather increases the cost. Comparative example 7 compares with example 13, and when the oleamide content is excessively high, the zipper welding effect is poor. Comparative example 8 compares with example 13, when the silica content is too high, the silica is too much and the transparency is lowered. Comparative example 9 in comparison with example 3, the zipper was too stiff to leak when the polypropylene content was too high. Comparative example 10 in comparison to example 9, the zipper was too soft to leak when the polypropylene content was too low.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. The modified polypropylene zipper material for liquid packaging is characterized in that the formula comprises the following components:
50-70 parts by weight of polypropylene I,
30-50 parts by weight of toughening elastomer,
2-10 parts by weight of nucleation slipping master batch,
0.05-0.1 parts by weight of an antioxidant, and
0-0.1 part by weight of a composite light stabilizer;
wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts by weight;
the nucleated smooth master batch comprises: polypropylene II, inorganic silicon dioxide, a nucleating agent and a slipping agent, wherein the mass ratio of the polypropylene II to the inorganic silicon dioxide is (85-90): 5: (2.5-5): (2.5-5).
2. The modified polypropylene zipper material of claim 1, wherein the slip agent is selected from one or a combination of erucamide and oleamide.
3. The modified polypropylene zipper material according to claim 1, wherein the nucleating agent is a phosphate-based transparent nucleating agent;
preferably, the phosphate transparent nucleating agent is 2,2' -methylene-bis (4, 6-di-tert-butylphenyl phosphoric acid) aluminum hydroxide.
4. The modified polypropylene zipper material according to claim 1, wherein the polypropylene II is binary or ternary random copolymer polypropylene.
5. The modified polypropylene zipper material according to claim 1, wherein the inorganic silica has a particle size of 3 to 6 μm.
6. The modified polypropylene zipper material according to claim 1, wherein the polypropylene I is a random copolymer polypropylene having copolymer monomers comprising 86 wt.% to 98 wt.% propylene, 2 wt.% to 8 wt.% ethylene and 0 to 6% butene.
7. The modified polypropylene zipper material according to claim 6, wherein the polypropylene I is a unimodal low melting point polypropylene or a bimodal polypropylene; the low melting point means that the melting point of polypropylene is 127-139 ℃.
8. The modified polypropylene zipper material according to claim 7, wherein the modified polypropylene zipper material has a melt index of (10-30) g/10 min;
the melt index of the polypropylene I is (12-25) g/10 min.
9. The modified polypropylene zipper material of claim 1, wherein 30-50 parts by weight of the toughened elastomer comprises: 20-30 parts by weight of a styrenic thermoplastic elastomer and 10-20 parts by weight of a propylene-based elastomer;
preferably, the styrenic thermoplastic elastomer is selected from one or a combination of two or more of styrene/butadiene/styrene block copolymer, styrene/butadiene/styrene hydrogenated block copolymer, styrene/isoprene/styrene hydrogenated block copolymer, styrene/hexene-butene/styrene block copolymer and styrene/ethylene-propylene/styrene block copolymer;
preferably, the propylene-based elastomer is selected from one or a combination of more than two of ethylene propylene copolymer, propylene butene copolymer and propylene octene copolymer;
preferably, the antioxidant is a multi-element hindered phenol type and a phosphite compound type;
preferably, the composite light stabilizer is a hindered amine type.
10. A method for preparing a modified polypropylene zipper material for liquid packaging as claimed in any one of claims 1 to 9, which comprises the steps of:
preparing the nucleating smooth master batch:
adding the polypropylene II, the inorganic silicon dioxide, the nucleating agent and the slipping agent into a high-speed mixer in sequence, fully and uniformly mixing, adding into a double-screw extruder, and carrying out water-cooling, bracing and granulating to obtain the nucleating slipping master batch;
preparing a modified polypropylene zipper material:
mixing the polypropylene I, the toughened elastomer, the nucleated smooth master batch, the antioxidant and the composite light stabilizer, adding the mixture into an extruder, or feeding the mixture into the extruder according to a proportion, extruding, cooling with water, drying and granulating to obtain the modified polypropylene zipper material;
preferably, in the preparation process of the nucleation slipping master batch, the temperature of the water-cooling bracing and granulating is 180-200 ℃, and the screw rotating speed of the double-screw extruder is not more than 280 rpm;
preferably, during the preparation process of the modified polypropylene zipper material, the extrusion temperature is 160-200 ℃, and the extrusion speed does not exceed 300rpm low torque speed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111150462.8A CN113861567B (en) | 2021-09-29 | 2021-09-29 | Modified polypropylene zipper material for liquid packaging and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113999535A (en) * | 2022-01-04 | 2022-02-01 | 浙江金仪盛世生物工程有限公司 | Thermoplastic elastomer material and thermoplastic elastomer pipeline |
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| JP6731128B1 (en) * | 2020-03-16 | 2020-07-29 | 株式会社Adeka | Granular nucleating agent, resin composition, method for producing the same, and molded article |
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| JPH11255981A (en) * | 1998-03-10 | 1999-09-21 | Mitsuboshi Belting Ltd | Thermoplastic elastomer composition for powder slash molding |
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| CN113999535A (en) * | 2022-01-04 | 2022-02-01 | 浙江金仪盛世生物工程有限公司 | Thermoplastic elastomer material and thermoplastic elastomer pipeline |
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