CN111040311A - Polypropylene composite material for heat-seal welding and preparation method thereof - Google Patents
Polypropylene composite material for heat-seal welding and preparation method thereof Download PDFInfo
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- CN111040311A CN111040311A CN201911367109.8A CN201911367109A CN111040311A CN 111040311 A CN111040311 A CN 111040311A CN 201911367109 A CN201911367109 A CN 201911367109A CN 111040311 A CN111040311 A CN 111040311A
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- 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
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Abstract
The invention discloses a polypropylene composite material for heat sealing welding and a preparation method thereof, wherein the composite material mainly comprises the following components in parts by weight: PP: 92-97 parts of PTFE: 0.5-1 part of nano rigid particles: 0.5-3 parts of carbon black master batch: 0-2 parts of antioxidant: 0.5-1 part of lubricant and 0.5-1 part of lubricant. According to the invention, the nano rigid particles are added as a nucleating agent to perform reinforcing, toughening and modification on polypropylene, so that the strength and modulus of the polypropylene are improved, the polypropylene material is ensured not to stick a plate and not to be drawn during heat sealing welding, the advantage of strong corrosion resistance at normal temperature is maintained, the requirement of high strength is met, and the excellent performance of heat sealing welding is also maintained.
Description
Technical Field
The invention relates to the field of modification of high polymer materials, in particular to a polypropylene composite material for heat sealing welding and a preparation method thereof.
Background
Polypropylene (PP) is a polymer taking [ -CH2-CHCH3- ] n as a main chain, is colorless, odorless, nontoxic and semitransparent solid matter, has the characteristics of high crystallinity, high strength, low creep, excellent dimensional stability and the like, has excellent resistance to corrosion of acid, alkali, salt solution and various organic solvents at normal temperature, is widely applied to the production of machines, electronic and electric appliances, medical instruments, conveying pipelines, chemical containers and the like, and is also used for packaging foods and medicines.
Polypropylene, one of the general-purpose plastics, is the lowest-density material among all general-purpose plastics and engineering plastics, and is one of the greatest cost advantages: the polypropylene is reinforced by glass fibers or minerals, so that higher strength and rigidity can be obtained, the polypropylene has good dimensional stability and is convenient to process and form, in addition, the raw materials are cheap and easy to obtain, and occupy important positions in new materials, but the defects of glass fiber reinforcement and mineral filling are overcome, and meanwhile, the excellent corrosion resistance and heat sealing performance of the polypropylene are reduced. In order to expand the application of non-reinforced PP materials, polypropylene needs to be modified by special additives, so that the requirement of higher strength is met, the excellent corrosion resistance and the excellent performance of heat-seal welding of the polypropylene are kept, and the polypropylene can be applied to certain fields requiring special requirements, such as battery shells and container bodies. However, at present, during the heat-sealing welding process of polypropylene, the problem of plate sticking and wire drawing caused by high temperature often occurs.
Therefore, in combination with the above problems, it is an urgent need to solve the problems of the art to provide a polypropylene composite material for heat sealing welding and a method for preparing the same.
Disclosure of Invention
In view of the above, the invention provides a polypropylene composite material for heat sealing welding and a preparation method thereof, and the polypropylene composite material with high strength and high performance is obtained by introducing nano rigid particles to fill PP and selecting proper PTFE and lubricant, and meanwhile, the advantages of no plate sticking, no wire drawing, and strong corrosion resistance at normal temperature in the heat sealing welding of the PP material are ensured.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a polypropylene composite material for heat-seal welding is mainly composed of the following components in parts by weight:
PP: 92-97 parts
PTFE: 0.5 to 1 portion
Nano rigid particles: 0.5 to 3 portions of
Carbon black master batch: 0 to 2 portions of
Antioxidant: 0.5 to 1 portion
0.5-1 part of lubricant.
Preferably, the PP is a low-melt index co-polypropylene.
Preferably, the PTFE is pure powder type anti-dropping polytetrafluoroethylene, and the molecular weight of the PTFE is 400-500 ten thousand.
Preferably, the nano rigid particles comprise one or more of nano calcium sulfate whiskers, nano talcum powder and nano silicon oxide.
Preferably, the carbon black master batch is a nonpolar carbon black master batch.
Preferably, the antioxidant is antioxidant 1010, antioxidant 168 or antioxidant DLTP.
Preferably, the lubricant is a PPA fluoropolymer.
A preparation method of a polypropylene composite material for heat-seal welding comprises the following specific steps:
s1, weighing the raw materials, placing the raw materials into a high-speed mixer, stirring and mixing the raw materials at the rotating speed of 80-100rpm for 3-4min, and uniformly mixing the raw materials;
and S2, extruding and granulating the mixture through a double-screw extruder to obtain the polypropylene composite material.
Preferably, the temperature of each section of the double-screw extruder is controlled to be 160-210 ℃, and the screw rotating speed is set to be 300-400rpm for granulation.
The application of the polypropylene composite material for heat-seal welding is characterized in that a part is obtained by injection molding of the polypropylene composite material, the temperature of each section of an injection molding machine is controlled to be 160-420 ℃, and the temperature for heat-seal welding forming is controlled to be 300-420 ℃.
Through the technical scheme, compared with the prior art, the invention has the following beneficial effects:
according to the invention, polypropylene is used as a raw material and is modified to prepare the polypropylene composite material for heat-seal welding, nano rigid particles are added as a nucleating agent to reinforce, toughen and modify the polypropylene, so that the strength and modulus of the polypropylene are improved, proper PTFE is selected, the melt strength of the polypropylene is further improved by adding PTFE (with the molecular weight of 400-500 ten thousand), and then a lubricant and a nonpolar dyeing master batch which are excellent in external lubrication demoulding are selected, so that the high-strength high-performance polypropylene composite material is successfully obtained, meanwhile, the polypropylene material is ensured not to stick a plate during heat-seal welding, and the advantage of strong corrosion resistance at normal temperature is maintained, the requirement of high strength is met, and the excellent performance of heat-seal welding is also maintained.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The raw materials used in the examples: PP is K8003 (medium petroleum, copolymer type), PTFE is FA-500H (large gold, anti-dripping type, particle size 0.3 μm), rigid particles are nano talcum powder (commercially available), the used lubricant is PPA9000H (Lupus chemical), the used carbon black master batch is nonpolar black master batch (Kabot), and the used antioxidant is hindered phenol 1010, phosphate 168 or thioester DLTP (Tianjin Rianlong).
Example 1
The embodiment 1 of the invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 96.5 parts of; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part; firstly, adding PP, PTFE, PPA9000H, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Example 2
The embodiment 2 of the invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 96.5 parts of; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part; firstly, adding PP, PTFE, PPA9000H, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 420 ℃.
Comparative example 1
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 97.5 parts; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; firstly, adding PP, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Comparative example 2
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 97 parts of; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; adding PP, PTFE, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Comparative example 3
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 97 parts of; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part; firstly, adding PP, PPA9000H, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Comparative example 4
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 99.5 parts of; antioxidant: 0.5 part; firstly, adding PP and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Comparative example 5
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 99.5 parts of; antioxidant: 0.5 part; firstly, adding PP and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 420 ℃.
Example 3
In order to further illustrate the beneficial effects of the technical scheme of the invention, the samples obtained in the examples 1-2 and the comparative examples 1-5 are subjected to performance detection. The test results are shown in table 1 below, in which the test standards are ISO standards.
TABLE 1
By comparing comparative example 1 and comparative example 2, it can be seen that the material heat-seal welds the plate badly and the wire drawing is severe without other modifications. Through comparative example 1 and comparative example 4, it can be found that the tensile strength, flexural strength and flexural modulus of comparative example 1 are all higher than those of comparative example 4, because the nano rigid particles added in comparative example 4 act as nucleating agents, so that the crystallization of PP is promoted, the crystallinity of PP is improved, and the mechanical properties of PP are further improved. Comparing comparative example 2, comparative example 3 and comparative example 1, it can be seen that after the PTFE or PPA9000H is added, the heat-seal welding of the material is greatly improved, and the mechanical properties of the material are higher than those before the material is modified; in the comparative example 2, PTFE is uniformly dispersed in the material through screw shearing, so that the three-dimensional network effect is achieved, the melt strength of the material is improved, and the material is not easy to stick to a plate in heat-seal welding; in comparative example 3, the PPA9000H plays an external lubricating role in heat seal welding, and the PPA9000H has good compatibility with the matrix PP, so that the auxiliary agent analysis cannot migrate to the surface of an article and influence the heat seal welding performance. Comparing comparative example 1, comparative example 2, comparative example 3 and example 1, it can be seen that when PTFE and PPA9000H are used in combination, the heat-seal welding of the material is further improved with the mechanical retention of the material, and the heat-seal welding effect of the material is better comparing the heat-seal welding temperatures of 300 ℃ and 420 ℃. According to the test results, the PP composite material formula applied to heat-seal welding and the preparation method thereof provided by the embodiment of the invention can obtain the PP material with high strength and high performance, and simultaneously solve the problem of poor heat-seal welding of the common PP material.
Example 4
The embodiment 4 of the invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 96 parts of (1); PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part, carbon black: 0.5 part; adding assistants such as PP, PTFE, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Example 5
The embodiment 5 of the invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 95.5 parts; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part, non-polar carbon black master batch: 1 part; adding assistants such as PP, PTFE, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Example 6
The embodiment 6 of the invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 95.5 parts; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part, non-polar carbon black master batch: 1 part; adding assistants such as PP, PTFE, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 420 ℃.
Comparative example 6
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 95.5 parts; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part, common polar carbon black master batch: 1 part; adding assistants such as PP, PTFE, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 300 ℃.
Comparative example 7
The invention discloses a polypropylene composite material for heat-seal welding, which adopts the following technical scheme:
the concrete weight fraction ratio of each component is, PPK 8003: 95.5 parts; PTFE: 0.5 part; nano rigid particles: 2 parts of (1); antioxidant: 0.5 part; PPA 9000H: 0.5 part, common polar carbon black master batch: 1 part; adding assistants such as PP, PTFE, nano rigid particles and an antioxidant into a high-speed mixer according to the proportion, mixing for 3min, then extruding and granulating the uniformly mixed materials through a double-screw extruder to obtain modified particles, wherein the set temperature of each section of the extruder is as follows: 160 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, the screw speed is set to 350 rpm. And then performing injection molding on the modified particles to obtain a finished product of a finished product, wherein the injection molding temperature is 190 ℃, 200 ℃ and 210 ℃, and finally performing heat-seal welding on the product, wherein the welding temperature is 420 ℃.
Example 7
In order to further illustrate the beneficial effects of the technical scheme of the invention, the samples obtained in examples 4-6 and comparative examples 6-7 are subjected to performance detection. The test results are shown in table 2 below, in which the test standards are ISO standards.
TABLE 2
Through comparing the test results of examples 4-6 in table 2, it is found that the common carbon black and the nonpolar carbon black master batch do not affect the heat seal welding performance of the PP material, but in the actual production process, considering the environmental protection problem, the nonpolar carbon black master batch is recommended to be used, so that the dust pollution of the carbon black in the actual production process is avoided. From comparative examples 6 to 7, no matter whether the heat-seal welding temperature is 300 ℃ or 420 ℃, the heat-seal welding problem has plate sticking and wire drawing phenomena, and the main reason is that the polar component in the black master batch has large mutual adsorption with the metal plate under the high-temperature condition.
In summary, according to the polypropylene composite material for heat-seal welding and the preparation method thereof provided by the embodiments of the present invention, the nano rigid particles are added to reinforce, toughen and modify the PP, and then the appropriate PTFE and the lubricant are selected, so that the high strength performance is successfully obtained, the non-sticking plate of the PP material during heat-seal welding is ensured not to be subjected to wire drawing, and the advantage of strong corrosion resistance at normal temperature is maintained, so that the high-strength and high-performance polypropylene composite material is obtained.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The polypropylene composite material for heat-seal welding is characterized by mainly comprising the following components in parts by weight:
PP: 92-97 parts
PTFE: 0.5 to 1 portion
Nano rigid particles: 0.5 to 3 portions of
Carbon black master batch: 0 to 2 portions of
Antioxidant: 0.5 to 1 portion
0.5-1 part of lubricant.
2. A polypropylene composite for heat-seal welding according to claim 1, wherein the PP is a low melt index co-polypropylene.
3. The polypropylene composite material for heat-seal welding as claimed in claim 1, wherein the PTFE is pure powder type anti-dripping polytetrafluoroethylene with molecular weight of 400-500 ten thousand.
4. The polypropylene composite material for heat-seal welding according to claim 1, wherein the nano rigid particles comprise one or more of nano calcium sulfate whisker, nano talcum powder and nano silicon oxide.
5. The polypropylene composite material for heat-seal welding as claimed in claim 1, wherein the antioxidant is antioxidant 1010, antioxidant 168 or antioxidant DLTP.
6. A polypropylene composite for heat seal welding according to claim 1, wherein the lubricant is PPA fluoropolymer.
7. A method for preparing a polypropylene composite material for heat-seal welding according to any one of claims 1 to 6, characterized by comprising the following steps:
s1, weighing the raw materials, placing the raw materials into a high-speed mixer, stirring and mixing the raw materials at the rotating speed of 80-100rpm for 3-4min, and uniformly mixing the raw materials;
and S2, extruding and granulating the mixture through a double-screw extruder to obtain the polypropylene composite material.
8. The method as claimed in claim 7, wherein the temperature of each section of the twin-screw extruder is controlled at 160-210 ℃, and the screw speed is set at 300-400rpm for pelletization.
9. Use of a polypropylene composite material for heat-seal welding according to any one of claims 1 to 6, wherein the polypropylene composite material is injection molded to obtain a molded part, and the temperature of each section of the injection molding machine is controlled to be 160-210 ℃ and the temperature of the heat-seal welding is controlled to be 300-420 ℃.
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| CN116253956A (en) * | 2022-08-29 | 2023-06-13 | 骆驼集团塑胶制品有限公司 | Polypropylene material capable of preventing heat sealing adhesive and preparation method thereof |
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| CN109485992A (en) * | 2018-09-12 | 2019-03-19 | 浙江科普特新材料有限公司 | A kind of thermoplastic vulcanizate composition and preparation method thereof of high abrasion low-friction coefficient |
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| CN116253956B (en) * | 2022-08-29 | 2024-07-02 | 骆驼集团塑胶制品有限公司 | Polypropylene material capable of preventing heat sealing adhesive and preparation method thereof |
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