CN112574500A - High-rigidity high-heat-seal-strength polypropylene material and preparation method thereof - Google Patents
High-rigidity high-heat-seal-strength polypropylene material and preparation method thereof Download PDFInfo
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- CN112574500A CN112574500A CN202011123983.XA CN202011123983A CN112574500A CN 112574500 A CN112574500 A CN 112574500A CN 202011123983 A CN202011123983 A CN 202011123983A CN 112574500 A CN112574500 A CN 112574500A
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- antioxidant
- wollastonite
- polypropylene material
- seal strength
- polypropylene
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- -1 polypropylene Polymers 0.000 title claims abstract description 61
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 57
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 57
- 239000000463 material Substances 0.000 title claims abstract description 49
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000010456 wollastonite Substances 0.000 claims abstract description 40
- 229910052882 wollastonite Inorganic materials 0.000 claims abstract description 40
- 239000011347 resin Substances 0.000 claims abstract description 25
- 229920005989 resin Polymers 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 239000004594 Masterbatch (MB) Substances 0.000 claims abstract description 10
- 238000001125 extrusion Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 7
- 239000000155 melt Substances 0.000 claims abstract description 6
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 6
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 24
- 230000003078 antioxidant effect Effects 0.000 claims description 24
- JKIJEFPNVSHHEI-UHFFFAOYSA-N Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) Chemical compound CC(C)(C)C1=CC(C(C)(C)C)=CC=C1OP(OC=1C(=CC(=CC=1)C(C)(C)C)C(C)(C)C)OC1=CC=C(C(C)(C)C)C=C1C(C)(C)C JKIJEFPNVSHHEI-UHFFFAOYSA-N 0.000 claims description 14
- 239000004611 light stabiliser Substances 0.000 claims description 12
- 239000000314 lubricant Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 8
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 7
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical group CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 7
- 239000002250 absorbent Substances 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims description 2
- 238000011049 filling Methods 0.000 abstract description 5
- 238000001816 cooling Methods 0.000 description 7
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 210000004027 cell Anatomy 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 239000004033 plastic Substances 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 238000007605 air drying Methods 0.000 description 2
- 210000005056 cell body Anatomy 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- FTQWRYSLUYAIRQ-UHFFFAOYSA-N n-[(octadecanoylamino)methyl]octadecanamide Chemical class CCCCCCCCCCCCCCCCCC(=O)NCNC(=O)CCCCCCCCCCCCCCCCC FTQWRYSLUYAIRQ-UHFFFAOYSA-N 0.000 description 1
- NFHFRUOZVGFOOS-UHFFFAOYSA-N palladium;triphenylphosphane Chemical compound [Pd].C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1.C1=CC=CC=C1P(C=1C=CC=CC=1)C1=CC=CC=C1 NFHFRUOZVGFOOS-UHFFFAOYSA-N 0.000 description 1
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/12—Polypropene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
- C08K7/10—Silicon-containing compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
A high-rigidity high-heat-seal-strength polypropylene material and a preparation method thereof are disclosed, which comprises the following components: 88.5 to 94.3 percent of polypropylene resin; 5-10% of a reinforcing agent; 0.7-1.5% of other auxiliary agents; the reinforcing agent is modified wollastonite; the preparation method comprises the following steps: weighing polypropylene resin with half of the feeding amount, putting the polypropylene resin into a high-speed mixer, putting other raw materials except the modified wollastonite into the mixer, and fully mixing to obtain a mixture; putting the mixture into a main feeding inlet of an extruder, adding the modified wollastonite from a side feeding inlet of the extruder, extruding and granulating to obtain wollastonite master batches, wherein the melt extrusion temperature is 185-200 ℃: mixing the wollastonite masterbatch with the other half of the polypropylene resin. Compared with the prior art, the invention adopts the modified wollastonite to reinforce the polypropylene material, and can realize higher rigidity under lower filling amount. At the same time, the lower filling allows for better heat seal strength of the material.
Description
Technical Field
The invention relates to a high polymer material used for a valve-controlled battery groove body, in particular to a high-rigidity high-heat-seal-strength polypropylene material and a preparation method thereof.
Background
Polypropylene (polypropylene) is a versatile plastic. The composite material has the advantages of excellent mechanical property, good forming and processing properties, good electrical insulation property and better tolerance to common chemicals.
The valve-controlled lead-acid accumulator is a special one, and is divided into lean-liquor type and colloid type. Compared with the common rich-solution lead-acid storage battery, the internal pressure of the valve-controlled battery is higher. The rigidity of the common polypropylene material used for preparing the groove body of the valve-regulated battery is insufficient, and if the unmodified polypropylene material is directly used for the groove body of the valve-regulated battery, the bulging and deformation of the battery can occur, and the normal use of the product is influenced.
The tank body of the current valve-regulated battery is made of talcum powder filled modified polypropylene material, compared with the common polypropylene material, the rigidity of talcum powder filled modified polypropylene is higher, and the requirement of the tank body of the valve-regulated battery on the rigidity can be met. The heat sealing is a key process in the production process of the cell body of the storage battery, the large battery cover and the cell tank are respectively heated by a hot plate, then the large battery cover and the cell body are pressed in a molten state, and the cell tank cover is bonded into a whole after cooling. In order to meet the requirement of high rigidity, the filling amount of the talcum powder modified polypropylene is higher, and tests show that the heat sealing strength of the battery cell cover made of the high-filling polypropylene material is poor, the heat sealing surface is broken when the battery cell cover is used in a vibration environment, and the leakage of the battery is invalid.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a polypropylene material with high rigidity and high heat-seal strength.
The invention also aims to provide a preparation method of the polypropylene material with high rigidity and high heat-seal strength.
The above purpose of the invention is realized by the following technical scheme:
the polypropylene material with high rigidity and high heat seal strength comprises the following components in percentage by mass: 88.5-94.3% of polypropylene resin, 5-10% of reinforcing agent and 0.7-1.5% of other auxiliary agents;
the reinforcing agent is modified wollastonite;
the other auxiliary agents are an antioxidant, a light stabilizer and a lubricant, wherein the antioxidant accounts for 0.2-0.5% of the total mass of the material; the lubricant accounts for 0.3-0.5% of the total mass of the material; the light stabilizer accounts for 0.2-0.5% of the total mass of the material.
The antioxidant is one or two of antioxidant tetra (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid) pentaerythritol ester (antioxidant 1010) and antioxidant tris (2, 4-di-tert-butylphenyl) phosphite ester (antioxidant 168).
The antioxidant is a main antioxidant of tetra (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid) pentaerythritol ester, and 0.2 percent of auxiliary antioxidant of tri (2, 4-di-tert-butylphenyl) phosphite ester, and the weight ratio is 1: 2.
the light stabilizer is an ultraviolet absorbent, and the types of the light stabilizer are UV-531 and UV-770.
The lubricant is Ethylene Bis Stearamide (EBS), is a representative variety of plastic lubricant fatty bis amide compounds, and has the model number of EBS 325 meshes.
The length-diameter ratio of the modified wollastonite is 12: 1, treating the surface with a coupling agent.
Preferably, the polypropylene resin is a commercially available general-purpose grade co-polypropylene, and different grades can be selected according to specific requirements.
The preparation method of the polypropylene material with high rigidity and high heat-seal strength comprises the following steps:
1) preparing materials: weighing raw materials according to a mass ratio, wherein the raw materials comprise polypropylene resin, modified wollastonite and other auxiliary agents;
2) mixing: weighing polypropylene resin with half of the feeding amount, putting the polypropylene resin into a high-speed mixer, putting other raw materials except the modified wollastonite into the mixer, and fully mixing to obtain a mixture;
3) melt extrusion: putting the mixture into a main feeding inlet of an extruder, adding the modified wollastonite from a side feeding inlet of the extruder, extruding and granulating to obtain wollastonite master batches, wherein the melt extrusion temperature is 185-200 ℃;
4) mixing and packaging for later use: uniformly mixing the wollastonite masterbatch prepared in the step 3) with the other half of the polypropylene resin, and packaging for later use.
In the step 3) melt extrusion of the invention, the rotating speed of a screw of a main machine of the extruder is 330-380 r/min, the feeding frequency of the main machine is 22-30Hz, and the corresponding side feeding frequency is 8-12 Hz.
Compared with the prior art, the invention has the following beneficial effects: the high-rigidity high-heat-seal-strength polypropylene material provided by the invention is reinforced by adopting the modified wollastonite, the wollastonite is a needle-shaped filler which is a silicate and does not react with the electrolyte, and a side feeding processing method is selected, so that a relatively good length-diameter ratio can be kept in the final modified material. At the same time, the lower filling allows for better heat seal strength of the material.
In the prior art, all components of a plastic material are added from a main feeding of an extruder, wollastonite is used as a needle-shaped filler, if the components are added from the main feeding, on one hand, friction is increased due to overlong path, on the other hand, the friction force among materials is overlarge due to insufficient melting of resin at a conveying section of the extruder, and the needle-shaped wollastonite is excessively abraded due to two factors, so that the length-diameter ratio is reduced and the failure is caused. The wollastonite is added from the side feeding port at the middle section of the extruder, so that the situation that the path of the wollastonite passing through the extruder is too long can be avoided, in addition, the resin at the middle section of the extruder is fully melted, the friction force between materials is small, the modified wollastonite is fed from the side of the extruder, the excessive friction of the wollastonite can be avoided, and the original length-diameter ratio is kept as much as possible.
Effect tests prove that the length-diameter ratio of wollastonite is kept well under the condition of the preparation method of the invention by the rotating speed of the host screw, the wollastonite masterbatch has the wollastonite content of 10% under the conditions of the host feeding frequency and the corresponding side feeding frequency at the rotating speed, and the wollastonite masterbatch is prepared by adopting the method; the master batch is mixed with the resin raw material to obtain the polypropylene material with high rigidity and high heat seal strength, and the polypropylene material prepared by adopting the method has better heat seal strength than the traditional process. The reason is that the dispersing capacity of the screw of the injection molding machine is weaker, and the master batch and raw material adding mode is adopted to ensure that more resin raw materials exist on the heat sealing surface, so that the heat sealing strength is better.
The material prepared by the invention has excellent rigidity and heat sealing strength, and compared with a comparison sample, the heat sealing strength of the material prepared by the invention is obviously superior to that of the comparison sample under the same rigidity level.
Detailed Description
The present invention is further explained with reference to the following examples, which are not intended to limit the present invention in any way.
Example 1
Firstly, 45.6 percent of polypropylene resin, 0.3 percent of lubricant EBS 325 meshes, 0.2 percent of light stabilizer UV-770, 0.1 percent of main antioxidant pentaerythritol tetrakis (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate) (1010) and 0.2 percent of auxiliary antioxidant tris (2, 4-di-tert-butylphenyl) phosphite (168) are put into a high-speed mixer to be mixed for two minutes, so that the components are fully stirred and uniformly dispersed for later use. The mixed material enters a main feeding inlet of a double-screw extruder from a metering feeder, 8 mass percent of modified wollastonite (the length-diameter ratio is more than 10, preferably Von Jiashan WFC 5-2101) is added into the extruder from a side feeding inlet, the melt extrusion temperature is 185-200 ℃, the screw rotating speed is 380 r/min, the main machine feeding frequency is 30Hz, and the corresponding side feeding frequency is 12 Hz.
And plasticizing, melting, extruding, cooling, granulating and magnetizing to obtain the wollastonite master batch. And cooling, air-drying, granulating and strongly magnetizing the obtained wollastonite master batch, uniformly mixing with the remaining 45.6 mass percent of polypropylene resin, and packaging for later use.
Example 2
Firstly, putting 44.5 percent of polypropylene resin by mass, 0.4 percent of lubricant EBS 325 meshes by mass, 0.3 percent of light stabilizer UV-531 by mass, 0.1 percent of main antioxidant pentaerythritol tetrakis (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate (1010) by mass and 0.2 percent of auxiliary antioxidant tris (2, 4-di-tert-butylphenyl) phosphite (168) into a high-speed mixer to be mixed for two minutes to fully stir and uniformly disperse all the components for later use. And (3) feeding the mixed material into a main feeding inlet of a double-screw extruder from a metering feeder, adding 10 mass percent of modified wollastonite into the extruder from a side feeding inlet for plasticizing and melting, and then extruding, cooling, granulating and magnetizing to obtain wollastonite master batches. The melt extrusion temperature is 185-200 ℃, the screw rotating speed is 330-380 r/min, the main machine feeding frequency is 22-30Hz, and the corresponding side feeding frequency is 8-12 Hz.
And cooling, air-drying, granulating and strongly magnetizing the obtained wollastonite master batch, uniformly mixing with the remaining 44.5 mass percent of polypropylene resin, and packaging for later use.
Comparative example 1
Putting 84 mass percent of polypropylene resin, 15 mass percent of modified talcum powder, 0.5 mass percent of lubricant, 0.2 mass percent of light stabilizer UV-770, 0.1 mass percent of main antioxidant tetra (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid) pentaerythritol ester (1010) and 0.2 mass percent of auxiliary antioxidant tri (2, 4-di-tert-butylphenyl) phosphite (168) into a high-speed mixer, mixing for two minutes, then feeding the mixture into a double-screw extruder from a metering feeder for plasticizing and melting, extruding, cooling, granulating, magnetizing and packaging for later use. The melt extrusion temperature is between 185 ℃ and 200 ℃.
Comparative example 2
Firstly, putting 91 mass percent of polypropylene resin, 0.5 mass percent of lubricant, 0.2 mass percent of light stabilizer UV-531, 0.1 mass percent of main antioxidant tetra (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid) pentaerythritol ester (1010) and 0.2 mass percent of auxiliary antioxidant tri (2, 4-di-tert-butylphenyl) phosphite (168) into a high-speed mixer, mixing for two minutes, then feeding the mixture into a double-screw extruder from a metering feeder, putting 8 mass percent of modified wollastonite into the side of the extruder for plasticizing and melting, then extruding, cooling, granulating, magnetizing and packaging for later use
The properties of the high-rigidity high-heat-seal-strength polypropylene materials for injection molding obtained in examples 1 and 2 are compared with those of comparative examples 1 and 2 as follows
Examples 1 and 2 are preferred embodiments of the present invention.
Compared with comparative examples 1 and 2, the rigidity and the heat sealing strength of the high-rigidity high-heat-sealing-strength polypropylene material developed by the invention are superior to those of the traditional talcum powder modified polypropylene and wollastonite modified polypropylene prepared by the traditional process. The material has good rigidity and toughness and excellent mechanical property. In addition, the preparation method is simple, and the energy consumption for preparing the same amount of materials is better than that of a comparison sample.
All changes made according to the technical scheme of the invention, when the generated functional function does not exceed the scope of the technical scheme of the invention, belong to the protection scope of the invention.
Claims (10)
1. The polypropylene material with high rigidity and high heat seal strength comprises the following components in percentage by mass: 88.5 to 94.3 percent of polypropylene resin; 5-10% of a reinforcing agent; 0.7-1.5% of other auxiliary agents;
the reinforcing agent is modified wollastonite;
the other auxiliary agents are an antioxidant, a light stabilizer and a lubricant.
2. A high stiffness and high heat seal strength polypropylene material according to claim 1, wherein: the antioxidant accounts for 0.2-0.5% of the total mass of the material; the lubricant accounts for 0.3-0.5% of the total mass of the material; the light stabilizer accounts for 0.2-0.5% of the total mass of the material.
3. A high stiffness and high heat seal strength polypropylene material according to claim 1, wherein: the antioxidant is one or two of antioxidant pentaerythritol tetra (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate) (antioxidant 1010) and antioxidant tris (2, 4-di-tert-butylphenyl) phosphite (antioxidant 168).
4. A high stiffness and high heat seal strength polypropylene material according to claim 1, wherein: the antioxidant is a main antioxidant of tetra (beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid) pentaerythritol ester, and 0.2 percent of auxiliary antioxidant of tri (2, 4-di-tert-butylphenyl) phosphite ester, and the weight ratio is 1: 2.
5. a high stiffness and high heat seal strength polypropylene material according to claim 1, wherein: the light stabilizer is an ultraviolet absorbent, and the types of the light stabilizer are UV-531 and UV-770.
6. A high stiffness and high heat seal strength polypropylene material according to claim 1, wherein: the lubricant is Ethylene Bis Stearamide (EBS).
7. A high stiffness and high heat seal strength polypropylene material according to claim 1, wherein: the length-diameter ratio of the modified wollastonite is 12: 1.
8. a method for preparing the polypropylene material with high rigidity and high heat-sealing strength as claimed in claim 1, which is characterized by comprising the following steps:
1) and (3) preparing materials: weighing raw materials according to a mass ratio, wherein the raw materials comprise polypropylene resin, modified wollastonite and other auxiliary agents;
2) and mixing: weighing polypropylene resin with half of the feeding amount, putting the polypropylene resin into a high-speed mixer, putting other raw materials except the modified wollastonite into the mixer, and fully mixing to obtain a mixture;
3) and melt extrusion: putting the mixture into a main feeding inlet of an extruder, adding the modified wollastonite from a side feeding inlet of the extruder, extruding and granulating to obtain wollastonite master batches, wherein the melt extrusion temperature is 185-200 ℃;
4) uniformly mixing and packaging for later use: and (3) uniformly mixing the wollastonite master batch prepared in the step (3) with the other half of the polypropylene resin, and packaging for later use.
9. The method for preparing polypropylene material with high rigidity and high heat-seal strength as claimed in claim 8, wherein in the step 3) of melt extrusion, the rotation speed of the extruder host screw is 320-380 rpm.
10. The method for preparing polypropylene material with high rigidity and high heat-seal strength as claimed in claim 8, wherein in the step 3), the main feeding frequency is 22-30Hz, and the corresponding side feeding frequency is 8-12 Hz.
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| CN103059415A (en) * | 2013-01-16 | 2013-04-24 | 合肥杰事杰新材料股份有限公司 | Needle-like wollastonite modified polypropylene composite material and preparation method thereof |
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| CN103059415A (en) * | 2013-01-16 | 2013-04-24 | 合肥杰事杰新材料股份有限公司 | Needle-like wollastonite modified polypropylene composite material and preparation method thereof |
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