CN113861567B - 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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- 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
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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 nucleation slipping 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 nucleation slip master batch comprises: polypropylene II, inorganic silicon dioxide, nucleating agent and 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 embrittlement, low-temperature freezing intolerance and high-temperature steaming resistance of the PP, 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 is compact in sealing, prevents air from continuously entering the inner bag and is easy and convenient to operate. Zipper materials used in the commercial zipper composite bags are typically polyethylene, polypropylene and EVA (ethylene vinyl acetate). Generally, a welding process is adopted, welding performances of different materials are considered, and corresponding zipper materials are required to be selected for matching according to the material of the composite bag. For liquid packaging, the PE zipper and the film have good heat sealing property, are soft, and can realize liquid sealing through technical means, and see patent application CN109575407A, namely a film zipper production formula and flow. However, PE materials also have limitations such as resistance to irradiation sterilization, taste, inability to retort, etc.; in order to meet the application, a bag body made of PP material can be used, however, the bag body made of PP material cannot be welded with a PE zipper, and the existing PP zipper cannot play a role in water resistance due to the fact that the material is hard and the elasticity is insufficient, and can only be used for packaging some solid products.
The zipper material of the existing zipper composite bag has the following technical problems:
1) The PE zipper can be waterproof, but cannot be welded with the PP bag body;
2) The PE zipper material can be welded with the PP bag body after being modified, but the odor generated by the PE material after irradiation cannot be avoided, and the PE zipper material cannot resist high-temperature steaming and boiling and can be deformed after steaming and boiling;
3) The transparency of the PE zipper material is poor, and the appearance requirement of a product with the transparency requirement cannot be met;
4) The PP zipper is not waterproof due to high hardness and insufficient elasticity, and can only be used for packaging solid products;
5) The PP zipper material has higher energy consumption compared with the PE material;
6) The shrinkage rate of the PP zipper material is high, shrinkage pits are easy to generate when the zipper framework is formed, and the PP zipper is not full;
7) The PP zipper is usually high in heat sealing temperature, so that the PP zipper is easy to stretch, 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 generate a local delamination phenomenon;
8) The PP zipper material is brittle, is easy to break after bending, cannot resist low temperature and cannot be frozen.
Disclosure of Invention
In order to solve at least one of the technical problems, the invention provides a modified polypropylene zipper material for liquid packaging and a preparation method thereof.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the invention provides a modified polypropylene zipper material for liquid packaging, which comprises the following components in percentage by weight:
the polypropylene is prepared by the following steps of (1) 50-70 parts by weight,
the weight of the toughened elastomer is 30 to 50 percent,
the weight of the core-spun master batch is 2 to 10 parts,
antioxidant (0.05-0.1 parts by weight), and
the weight of the compound light stabilizer is 0 to 0.1;
wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts by weight;
the nucleation slip master batch comprises: polypropylene II, inorganic silicon dioxide, nucleating agent and 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 master batch, it is further preferred that the slip agent is selected from one or a combination of erucamide and oleamide.
The invention can ensure that the polypropylene zipper material is not too soft and has no stiffness through adding the nucleation slipping master batch, and simultaneously ensure the slipping property of the surface of the zipper, thereby being beneficial to the smooth traction of the zipper on a bag making machine by a traction mechanism, otherwise, the zipper is difficult to drag due to astringency, and the bag making efficiency is affected.
In the nucleation slip master batch, further preferably, the nucleating agent is a phosphate-based transparent nucleating agent; more preferably, the phosphate-based transparent nucleating agent is phosphate-based nucleating agent NA-21 (2, 2' -methylene-bis (4, 6-di-tert-butylphenyl phosphate) basic aluminum).
In the nucleated slip masterbatch, it is further preferred that the polypropylene II is a binary or ternary random copolymer polypropylene, such as an ethylene propylene binary copolymer polypropylene, having a melting point around 140 ℃ to maintain a similar melting point as the substrate polypropylene I.
In the nucleated smooth masterbatch, it is further preferred that the particle size of the inorganic silica is 3-6 μm.
According to the modified polypropylene zipper material, in order to ensure the welding effect, the polypropylene I is selected from random copolymerized polypropylene, and the copolymer monomer comprises 86-98 wt.% of propylene, 2-8 wt.% of ethylene and 0-6% of butene.
The DSC melting peak of the modified polypropylene zipper designed by the invention has a unimodal or bimodal structure, the melting point of the unimodal polypropylene is as low as possible, and the bimodal polypropylene can be free from the limitation, because the bimodal modified polypropylene material has a wider welding range, the design is used for realizing lower welding temperature and better welding effect with the PP bag body, reducing the energy consumption in the production process, ensuring the flatness of the sealing part of the PP bag body and avoiding the local delamination phenomenon at the sealing part of the PP bag body.
It is further preferred according to the present invention that the polypropylene I is a unimodal low melting point polypropylene or a bimodal polypropylene. The unimodal and bimodal 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 disclosed by the invention, in order to ensure the processing molding rate of the zipper and the integrity of the framework, the melt index of the modified polypropylene zipper material designed by the invention is relatively high but not excessively high, and the relatively high melt index of the polypropylene zipper material is between (10-30) g/10min, so that the lower melt viscosity of the zipper material in extrusion equipment is ensured by better fluidity, the molding speed of the zipper can be improved, the better plasticizing effect of the material in the equipment is also facilitated, the sufficient inlet die of the melt is ensured, and the zipper framework is molded more fully and completely. Correspondingly, the melt index of the polypropylene I is preferably (12-25) g/10min. The melt index detection conditions in the invention are 230 ℃ and 2.16kg pressure.
In the invention, the toughening elastomer is used for reducing the hardness of the skeleton zipper and increasing the elasticity, and when the upper strand chain and the lower strand chain of the skeleton zipper are embedded and sealed, enough elasticity can be generated, so that the tooth buckles of the upper strand chain and the lower strand chain can realize elastic sealing, thereby completely locking liquid and avoiding leakage caused by hard connection gaps between the tooth buckles.
In a preferred embodiment, 30 to 50 parts by weight of the toughening 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 ensures that the toughening elastomer is 30 to 50 parts by weight.
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 propenyl elastomer, so that the hardness of the zipper can be reduced, the stiffness of the zipper can be ensured, and meanwhile, the toughening elastomer has better elasticity and realizes liquid sealing.
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, leakage caused by gaps among the buckles due to overlarge shrinkage rate is avoided, and the polypropylene zipper material has better transparency and is suitable for products with better appearance quality requirements.
Preferably, the antioxidant is a compound of a multi-element hindered phenol type and a phosphite ester type; for example, the antioxidant 1010 is compounded with the antioxidant 168, the antioxidant 1010 is pentaerythritol tetrakis [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] 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 compound light stabilizer is a hindered amine type. Such as hindered amine light stabilizer HS-944 (CAS: 70624-18-9, poly { [6- [ (1, 3-tetramethylbutyl) amino ] ] -1,3, 5-triazine-2, 4- [ (2, 6), -tetramethyl-piperidinyl) imino ] -1, 6-hexamethylenediyl [ (2, 6-tetramethyl-4-piperidinyl) imino ] }), the hindered amine light stabilizer HS-765 (CAS: 82919-37-7, hindered amine light stabilizer HS-508 (292) is a mixture of bis (1, 2, 6-pentamethyl-4-piperidine) sebacate and 1- (methyl) -8- (1, 2, 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:
preparation of nucleation slipping 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, and adding the mixture into a double-screw extruder for water-cooling bracing and granulating to obtain the nucleated slipping master batch;
preparation of modified polypropylene zipper material:
and mixing the polypropylene I, the toughened elastomer, the nucleation smooth master batch, the antioxidant and the composite light stabilizer, and then adding into an extruder, or feeding into the extruder according to a proportion, extruding, water-cooling, 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 nucleation slipping master batch, the temperature of the water-cooling bracing piece dicing is 180-200 ℃, and the screw rotating speed of the double screw extruder is not more than 280rpm.
According to the preparation method of the present invention, preferably, in the preparation process of the modified polypropylene zipper material, the extrusion temperature is 160-200 ℃, and the extrusion speed is not more than 300rpm, which is a low torque speed.
The beneficial effects of the invention include:
1) Realize the waterproof effect of the PP zipper.
According to the invention, through the formula design, the stiffness of the polypropylene zipper material is kept, and the polypropylene zipper material has good elasticity, and 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, thus the liquid can be completely locked, and the leakage caused by the hard connection gaps between the tooth buckles is avoided.
2) Improving the brittle fracture resistance and the low-temperature freezing resistance of PP.
According to the invention, through the formula design, the styrene thermoplastic elastomer and the propenyl elastomer are 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 adopts the PP material, the styrene thermoplastic elastomer and the propenyl elastomer, so that PE material is avoided, and meanwhile, the hindered amine compound light stabilizer is adopted to ensure the stability of PP irradiation.
The PE can be degraded after irradiation to generate volatile gases such as aldehydes and aldehyde acid substances, and the odor of the volatile gases is very strong, so that the PE is unsafe, and the odor and the taste of food are affected; the PP substrate can not generate such substances, and in addition, the hindered amine compound 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 molding speed of the zipper, is beneficial to the material to obtain better plasticizing effect in the equipment, ensures the sufficient entry die of the melt, and ensures that the zipper framework is molded more fully and completely. The low-melting point unimodal or bimodal modified polypropylene material can reduce the welding temperature and better welding effect of the zipper and the PP bag body, ensure the flatness of the sealing part of the zipper and the PP bag body, especially the welding of the non-linear part, thereby reducing the energy consumption by about 50 percent in the production process, avoiding the local delamination phenomenon of the sealing part of the zipper and the PP bag body and avoiding liquid leakage.
5) The high-temperature steaming resistance of the PP zipper composite bag can be improved by utilizing the characteristics of PP.
PP has a melting point of 135 ℃ or higher than that of HDPE (high-density polyethylene) at 130 ℃, and LDPE (low-density polyethylene) is adopted as a common zipper material, and the melting point is only about 115 ℃, so that the PE composite zipper bag is softened and deformed after being filled with hot water, but the PP composite zipper bag can contain hot water and can be subjected to a sterilization mode of high-temperature steaming.
The modified polypropylene zipper material for liquid packaging provided by the invention can be applied to liquid food zipper composite bags, infant articles (milk storage bags and the like) zipper composite bags and medical reagent treatment composite bags.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
All numerical designations of the invention (e.g., temperature, time, concentration, weight, etc., including ranges for each) can generally be approximations that vary (+) or (-) as appropriate in 0.1 or 1.0 increments. All numerical designations are to be understood as preceded by the term "about".
Examples 1 and 2
Preparing a nucleation smooth master batch by adopting brace granulation, which comprises the following steps of;
and weighing erucamide or oleamide, inorganic silicon dioxide, nucleating agent and polypropylene according to the proportion. Wherein the particle size of the inorganic silicon dioxide is about 5 mu m, 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 keep the similar melting point with 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 polypropylene, inorganic silicon dioxide, nucleating agent, erucic acid amide or oleic acid amide into a high-speed mixer according to the sequence of the polypropylene, the inorganic silicon dioxide, the nucleating agent, the erucic acid amide or the oleic acid amide, fully and uniformly mixing, adding the mixture into a double-screw extruder for water-cooling bracing and granulating, 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 prevent auxiliary agent fluid from being sprayed out of a die, and preparing the nucleated smooth master batch.
TABLE 1 ingredients and amounts in nucleated smooth master batches
| Examples | Polypropylene/g | Inorganic silica/g | Nucleating agent/g | Oleic acid amides/g |
| 1 | 90 | 5 | 2.5 | 2.5 |
| 2 | 85 | 5 | 5 | 5 |
Examples 3 to 14
Preparing a modified polypropylene zipper material, which comprises the following steps:
sequentially adding polypropylene, styrene elastomer, propenyl elastomer, nucleation slipping master batch, antioxidant and light stabilizer, mixing in a color mixer for 3-5min, adding into an extruder after uniformly mixing, or using an automatic feeding system to feed according to a proportion, extruding at a low torque speed of not more than 300rpm at 160-200 ℃, water-cooling, drying, and granulating to obtain the modified polypropylene zipper material.
The formulation ingredients and amounts used in each example are shown in table 2 below, and a slide fastener was prepared using the polypropylene slide fastener material prepared in each example: and (3) putting the modified polypropylene zipper material into a feeding cylinder of a high-speed zipper extruder, melting at high temperature, extruding through a mouth die, and naturally cooling and shaping for more than 12 hours to obtain the polypropylene zipper. The technological temperature of the high-speed zipper extruder is set to be 120 ℃, 160 ℃, 140 ℃ from one section to five sections respectively.
The obtained modified polypropylene zippers were subjected to tests for hardness, melting point and impact strength, and the results are shown in Table 2. The test was performed according to the following national standard documents: hardness, GB/T2411-2008, melting point, GB/T19466.1-2004, impact strength GB/T1843-2008.
In Table 2, the unimodal low-melting polypropylene is random copolymer polypropylene, the melting point range is 127-139 ℃, and the melt index is 12-25g/10min; the bimodal polypropylene is random copolymer polypropylene, the low peak melting point is between 130 and 139 ℃, the peak melting point is between 145 and 152 ℃, and the melt index is between 12 and 25g/10min; the styrene elastomer is SEBS; the propenyl elastomer is ethylene propylene block copolymerization; the antioxidant is antioxidant 1010/antioxidant 168=1:1 (mass ratio); the compound light stabilizer is hindered amine type HS944:HS 765=1:2 (mass ratio).
Table 2 results of Performance test of the formulation components and amounts (parts by weight) and the obtained polypropylene slide fastener in examples 3 to 14
The above examples 3-14 were selected from unimodal polypropylene having a melting point below 140℃or bimodal polypropylene having a low temperature peak below 140℃and meltedThe index design is above 20g/10min, the process temperature of the zipper extrusion equipment can be set to 120 ℃, 160 ℃, 140 ℃ and 140 ℃ from one section to five sections respectively, and the process temperature is 30-40 ℃ lower than the extrusion temperature of 160 ℃, 165 ℃, 175 ℃, 180 ℃ and 180 ℃ of common PE, so that the equipment energy consumption is greatly saved, and the energy consumption is reduced by about 50 percent. The hardness of the zipper is maintained between HD 45 and HD 62, so that the requirements of the stiffness of the zipper material can be met, the hardness is too low, the framework sealing has no strength, the strength required by the buckling of the zipper cannot be realized, the zipper cannot leak at night, the elastic sealing of the framework of the zipper cannot be realized due to the too high hardness, and the zipper cannot leak at night due to the hard collision. The total content of the toughened elastomer is thus not more than 50% (based on 100% of the total weight of polypropylene and toughened elastomer). The propylene-based elastomer can provide higher room temperature impact strength (impact strength of not less than 30KJ/m 2 ) And better low temperature impact strength, but too much propylene-based elastomer reduces the clarity and resistance to boiling deformation of the zipper material by not more than 20% by weight (based on 100% by weight of the total polypropylene and toughening elastomer). The inorganic silica affects transparency, so that the proportion should not exceed 0.25% (based on 100% of the total weight of the polypropylene and the toughened elastomer), the oleamides are migration type slipping agents, and the welding effect of the zipper is excessively affected, so that the inorganic silica is compounded and used in an amount of not more than 0.1% (based on 100% of the total weight of the polypropylene and the toughened elastomer). The transparent nucleating agent can improve the transparency of the zipper material, the transparency is obviously changed along with the content of the transparent nucleating agent when the content is more than 0.05 percent, and the transparency is less obviously changed along with the content of the transparent nucleating agent when the content is more than 0.1 percent, wherein the transparency is not more than 0.1 percent (based on 100 percent of the total weight of the polypropylene and the toughened elastomer) in view of cost.
Comparative examples 1 to 10
The following comparative examples were prepared using the same procedure as in the above examples, and the specific formulations and properties of the resulting zipper materials, as well as comparative results corresponding to the prepared zippers, are shown in Table 3 below.
The process for preparing the zipper comprises the following steps:
the polypropylene zipper materials of comparative examples 1-10 are put into a feeding cylinder of a high-speed zipper extruder, melted at high temperature, extruded by a mouth die, and naturally cooled and shaped for more than 12 hours to obtain the polypropylene zipper. The technological temperature of the high-speed zipper extruder is set to be 120 ℃, 160 ℃, 140 ℃ from one section to five sections respectively.
In Table 3, the unimodal high-melting polypropylene was a random copolymer polypropylene having a melting point of 148℃and a melt index of 18g/10min; the PP with low melt index is random copolymer polypropylene, the melting point is 130 ℃, and the melt index is 5.5g/10min.
Table 3 comparative examples 1 to 10 in the formulation components and the amounts (parts by weight), the results of the performance test and the comparative results of the obtained polypropylene slide fastener
Compared with examples 7 and 8, when other polypropylene with the same performance but a high melting point is used, the processing temperature for preparing the zipper is above 160 ℃, which indicates that the low melting point unimodal or bimodal modified polypropylene material 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 zipper and the PP bag body, particularly the welding of the non-linear part, and further reduce the energy consumption in the production process by about 50 percent. Comparative example 2 was compared with examples 7 and 8, and when other polypropylene having the same properties but a low melt index was used, it was revealed that the difficulty in forming the slide fastener was caused by an excessively low melt index of the polypropylene, and it was necessary to select polypropylene having a concentration of (12-25) g/10min as defined in the present invention. Comparative example 3 was inferior in low temperature resistance to example 3 when only one elastomer was used, indicating that the combination of the styrenic thermoplastic elastomer and the acryl-based elastomer defined in the present invention can ensure low temperature resistance of the slide fastener. Comparative example 4 in comparison 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 propylene-based elastomer content is too high, the slide fastener becomes whitish and the transparency is lowered; it is explained that the effect is not good when the propylene-based elastomer content is too high in the elastomer composition defined in the present invention. In comparison with example 6 and example 13, when the content of the nucleating agent is too high, the transparency is not further improved, and the nucleating agent is expensive, but rather the cost is increased. Comparative example 7 was compared with example 13, and when the oleic acid amide content was too high, the zipper welding effect was poor. Comparative example 8 is compared with example 13, and when the silica content is too high, the silica is excessive and transparency is lowered. Comparative example 9 in contrast to example 3, when the polypropylene content is too high, the slide fastener is excessively hard to leak liquid. Comparative example 10 compares to example 9, and when the polypropylene content is too low, the zipper is too soft to leak liquid.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (9)
1. The modified polypropylene zipper material for liquid packaging is characterized by comprising the following components in percentage by weight:
the polypropylene is prepared by the steps of (1) and (70) by weight,
the weight of the toughened elastomer is 30 to 50 percent,
the weight of the core-spun masterbatch is 2 to 10 parts,
antioxidant (0.05-0.1 parts by weight)
The weight of the compound light stabilizer is 0 to 0.1;
wherein the total amount of the polypropylene I and the toughening elastomer is 100 parts by weight;
the nucleation slip master batch comprises: polypropylene II, inorganic silicon dioxide, nucleating agent and 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 nucleating agent is phosphate transparent nucleating agent;
the polypropylene I is selected from random copolymerized polypropylene, and the copolymer monomers comprise 86 wt% -98 wt% of propylene, 2 wt% -8 wt% of ethylene and 0% -6% of butene; the polypropylene I is unimodal low-melting point polypropylene or bimodal polypropylene, and the low-melting point refers to that the melting point of the polypropylene is 127-139 ℃; the melt index of the polypropylene I is (12-25) g/10min, and the melt index of the modified polypropylene zipper material is (10-30) g/10min;
the polypropylene II is binary or ternary random copolymer polypropylene;
30-50 parts by weight of the toughening elastomer comprises: 20-30 parts by weight of a styrenic thermoplastic elastomer and 10-20 parts by weight of a propylene-based elastomer;
the styrene thermoplastic elastomer is selected from one or more than two of styrene/butadiene/styrene block copolymer, styrene/butadiene/styrene hydrogenated block copolymer, styrene/isoprene/styrene hydrogenated block copolymer, styrene/hexene-butylene/styrene block copolymer and styrene/ethylene-propylene/styrene block copolymer;
the propylene-based elastomer is selected from one or more than two of ethylene propylene copolymer, propylene butylene copolymer and propylene octene copolymer.
2. The modified polypropylene zipper material according to 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 phosphate-based transparent nucleating agent is 2,2' -methylene-bis (4, 6-di-t-butylphenyl phosphate) basic aluminum.
4. The modified polypropylene zipper material according to claim 1, wherein the particle size of the inorganic silica is 3 to 6 μm.
5. The modified polypropylene zipper material according to claim 1, wherein the antioxidant is a compound of a polyhydric hindered phenol type and a phosphite ester type.
6. The modified polypropylene zipper material of claim 1, wherein the compound light stabilizer is a hindered amine type.
7. A method for producing a modified polypropylene zipper material for liquid packaging as claimed in any one of claims 1 to 6, characterized by comprising the steps of:
preparation of nucleation slipping 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, and adding the mixture into a double-screw extruder for water-cooling bracing and granulating to obtain the nucleated slipping master batch;
preparation of modified polypropylene zipper material:
and mixing the polypropylene I, the toughened elastomer, the nucleation smooth master batch, the antioxidant and the composite light stabilizer, and then adding into an extruder, or feeding into the extruder according to a proportion, extruding, water-cooling, drying and granulating to obtain the modified polypropylene zipper material.
8. The method according to claim 7, wherein the temperature of the water-cooled strand pellets is 180-200 ℃ and the screw speed of the twin-screw extruder is not more than 280rpm during the preparation of the nucleated and smooth master batch.
9. The method of claim 7, wherein the extrusion temperature is 160-200 ℃ and the extrusion speed is not more than 300rpm low torque speed during the preparation of the modified polypropylene zipper material.
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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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